Although the highest levels of PPAR<svg style="vertical-align:-2.34499pt;width:8.0625px;" id="M2" height="9.9375" version="1.1" viewBox="0 0 8.0625 9.9375" width="8.0625"  xmlns="http://www.w3.org/2000/svg">
	<g transform="matrix(1.25,0,0,-1.25,0,9.9375)">
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</svg> expression in the body have been reported in the gastrointestinal epithelium, little is known about the physiological functions of that receptor in the gut. Moreover, there is considerable controversy concerning the effects of thiazolidinedione  PPAR<svg style="vertical-align:-2.34499pt;width:8.0625px;" id="M3" height="9.9375" version="1.1" viewBox="0 0 8.0625 9.9375" width="8.0625"  xmlns="http://www.w3.org/2000/svg">
	<g transform="matrix(1.25,0,0,-1.25,0,9.9375)">
		<g transform="translate(72,-64.05)">
			<text transform="matrix(1,0,0,-1,-71.95,66.44)">
				<tspan style="font-size: 12.50px; " x="0" y="0">𝛾</tspan>
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</svg> agonists on the two major diseases of the gastrointestinal track: colorectal cancer and inflammatory bowel disease. We will undertake to review both historical and recently published data with a view toward summarizing what is presently known about the roles of  PPAR<svg style="vertical-align:-2.34499pt;width:8.0625px;" id="M4" height="9.9375" version="1.1" viewBox="0 0 8.0625 9.9375" width="8.0625"  xmlns="http://www.w3.org/2000/svg">
	<g transform="matrix(1.25,0,0,-1.25,0,9.9375)">
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</svg> in both physiological and pathological processes in the gastrointestinal epithelium.

Brian M. Necela

E. Aubrey Thompson

Pathophysiological Roles of PPAR<svg style="vertical-align:-2.7573pt" height="11.4125" version="1.1" viewBox="0 0 8.4499998 11.4125" width="8.4499998" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns="http://www.w3.org/2000/svg">
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Cholangiocarcinoma is a predominantly fatal cancer, which can be difficult to treat. It has been reported that the administration of pioglitazone temporarily improved not only diabetic control, but also bile duct carcinoma-induced cholangiohepatitis. Pioglitazone is considered to have both direct and indirect mechanisms of action on the tumor-related hepatitis. Several molecules induced by thiazolidinedione, including Smad pathway-related molecules, adipokines, and other lipid metabolism-related proteins, may directly or indirectly suppress tumor development and/or tumor-induced cholangiohepatitis. Although the most frequent and critical side effect of thiazolidinedione is drug-induced hepatitis, it can probably be avoided by careful monitoring of serum hepatic enzyme levels. Thiazolidinedione should be considered for management of tumor-induced hepatitis in the presence of diabetes unless severe side effects occur.

Satoru Suzuki

Kiyoshi Hashizume

Do PPAR<svg style="vertical-align:-3.56265pt" height="12.175" version="1.1" viewBox="0 0 8.6374998 12.175" width="8.6374998" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns="http://www.w3.org/2000/svg"><g transform="matrix(.017,-0,0,-.017,.062,7.675)"><path id="x1D6FE" d="M478 372q0 -39 -31 -97t-61 -98t-78 -98q-45 -55 -73 -102q-13 -79 -13 -197q-11 -11 -43.5 -25.5t-53.5 -15.5l-15 17q5 35 26 101.5t47 123.5q8 72 -1.5 174.5t-37.5 178.5q-14 37 -29 37q-20 0 -67 -65l-25 21q37 60 73 90.5t63 30.5q47 0 72 -112q13 -56 17.5 -141.5t0.5 -143.5h2q155 193 155 297q0 26 -12 47q-5 8 -5 15q0 16 12.5 27t29.5 11q21 0 34 -21t13 -55z"/></g></svg> Ligands Suppress the Growth of Cholangiocarcinoma or the Cholangiohepatitis Induced by the Tumor?

Peroxisome proliferator-activated receptor-<svg style="vertical-align:-2.34499pt;width:8.0625px;" id="M3" height="9.9375" version="1.1" viewBox="0 0 8.0625 9.9375" width="8.0625"  xmlns="http://www.w3.org/2000/svg">
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</svg> (PPAR<svg style="vertical-align:-2.34499pt;width:8.0625px;" id="M4" height="9.9375" version="1.1" viewBox="0 0 8.0625 9.9375" width="8.0625"  xmlns="http://www.w3.org/2000/svg">
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</svg>) and retinoic acid X-receptor (RXR) heterodimer, which regulates cell growth and differentiation, represses the TGF<svg style="vertical-align:-2.29482pt;width:8.8500004px;" id="M5" height="13.425" version="1.1" viewBox="0 0 8.8500004 13.425" width="8.8500004"  xmlns="http://www.w3.org/2000/svg">
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				<tspan style="font-size: 12.50px; " x="0" y="0">𝛽</tspan>
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</svg>1 gene that encodes for the protein involved in cancer biology. This review will introduce the novel mechanism associated with the inhibition of the TGF<svg style="vertical-align:-2.29482pt;width:8.8500004px;" id="M6" height="13.425" version="1.1" viewBox="0 0 8.8500004 13.425" width="8.8500004"  xmlns="http://www.w3.org/2000/svg">
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</svg>1 gene by PPAR<svg style="vertical-align:-2.34499pt;width:8.0625px;" id="M7" height="9.9375" version="1.1" viewBox="0 0 8.0625 9.9375" width="8.0625"  xmlns="http://www.w3.org/2000/svg">
	<g transform="matrix(1.25,0,0,-1.25,0,9.9375)">
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</svg> activation, which regulates the dephosphorylation of Zf9 transcription factor. Pharmacological manipulation of TGF<svg style="vertical-align:-2.29482pt;width:8.8500004px;" id="M8" height="13.425" version="1.1" viewBox="0 0 8.8500004 13.425" width="8.8500004"  xmlns="http://www.w3.org/2000/svg">
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</svg> activators can be applied for treating TGF<svg style="vertical-align:-2.29482pt;width:8.8500004px;" id="M10" height="13.425" version="1.1" viewBox="0 0 8.8500004 13.425" width="8.8500004"  xmlns="http://www.w3.org/2000/svg">
	<g transform="matrix(1.25,0,0,-1.25,0,13.425)">
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</svg>1-induced pathophysiologic disorders such as cancer metastasis and fibrosis. In this article, we will discuss the opposing effects of TGF<svg style="vertical-align:-2.29482pt;width:8.8500004px;" id="M11" height="13.425" version="1.1" viewBox="0 0 8.8500004 13.425" width="8.8500004"  xmlns="http://www.w3.org/2000/svg">
	<g transform="matrix(1.25,0,0,-1.25,0,13.425)">
		<g transform="translate(72,-61.26)">
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</svg>  on tumor growth and metastasis, and address the signaling pathways regulated by PPAR<svg style="vertical-align:-2.34499pt;width:8.0625px;" id="M12" height="9.9375" version="1.1" viewBox="0 0 8.0625 9.9375" width="8.0625"  xmlns="http://www.w3.org/2000/svg">
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Chang Ho Lee

Hyung Don Kim

Sang Mi Shin

Sang Geon Kim

A Novel Mechanism of PPAR<svg style="vertical-align:-3.56265pt" height="12.175" version="1.1" viewBox="0 0 8.6374998 12.175" width="8.6374998" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns="http://www.w3.org/2000/svg"><g transform="matrix(.017,-0,0,-.017,.062,7.675)"><path id="x1D6FE" d="M478 372q0 -39 -31 -97t-61 -98t-78 -98q-45 -55 -73 -102q-13 -79 -13 -197q-11 -11 -43.5 -25.5t-53.5 -15.5l-15 17q5 35 26 101.5t47 123.5q8 72 -1.5 174.5t-37.5 178.5q-14 37 -29 37q-20 0 -67 -65l-25 21q37 60 73 90.5t63 30.5q47 0 72 -112q13 -56 17.5 -141.5&#xA;t0.5 -143.5h2q155 193 155 297q0 26 -12 47q-5 8 -5 15q0 16 12.5 27t29.5 11q21 0 34 -21t13 -55z" /></g></svg> Regulation of TGF<svg style="vertical-align:-3.56265pt" height="16.6625" version="1.1" viewBox="0 0 18.1625 16.6625" width="18.1625" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns="http://www.w3.org/2000/svg"><g transform="matrix(.017,-0,0,-.017,.062,12.162)"><path id="x1D6FD" d="M558 587q0 -32 -14 -61t-40 -53.5t-48.5 -41t-54.5 -36.5q144 -51 144 -174q0 -55 -43.5 -108t-104.5 -87q-77 -42 -131 -42q-31 0 -54 20t-31 47l11 18q48 -29 108 -29q79 0 119.5 43t40.5 109t-44.5 107.5t-119.5 50.5l22 47q34 1 65 21q96 61 96 157q0 42 -24 67.5&#xA;t-62 25.5q-24 0 -43.5 -9t-35 -29.5t-27 -44t-22.5 -63t-19.5 -75.5t-18.5 -91q-57 -294 -68 -380q-26 -190 -35 -200q-26 -31 -97 -37l-4 26q19 9 48 170l77 413q23 121 52.5 187.5t83.5 114.5q70 62 148 62q51 0 88.5 -34t37.5 -91z" /></g><g transform="matrix(.017,-0,0,-.017,9.939,12.162)"><path id="x31" d="M384 0h-275v27q67 5 81.5 18.5t14.5 68.5v385q0 38 -7.5 47.5t-40.5 10.5l-48 2v24q85 15 178 52v-521q0 -55 14.5 -68.5t82.5 -18.5v-27z" /></g></svg>: Implication in Cancer Biology

Mononuclear phagocytes often function as control switches of the immune system, securing the balance between pro- and anti-inflammatory reactions. For this purpose and depending on the activating stimuli, these cells can develop into different subsets: proinflammatory classically activated (M1) or anti-inflammatory alternatively activated (M2) macrophages. The expression of the nuclear peroxisome proliferator-activated receptors (PPARs) is regulated by M1- or M2-inducing stimuli, and these receptors are generally considered to counteract inflammatory M1 macrophages, while actively promoting M2 activation. This is of importance in a tumor context, where M1 are important initiators of inflammation-driven cancers. As a consequence, PPAR agonists are potentially usefull for inhibiting the early phases of tumorigenesis through their antagonistic effect on M1. In more established tumors, the macrophage phenotype is more diverse, making it more difficult to predict the outcome of PPAR agonism. Overall, in our view current knowledge provides a sound basis for the clinical evaluation of PPAR ligands as chemopreventive agents in chronic inflammation-associated cancer development, while cautioning against the unthoughtful application of these agents as cancer therapeutics.

Jo A. Van Ginderachter

Kiavash Movahedi

Jan Van den Bossche

Patrick De Baetselier

Macrophages, PPARs, and Cancer

In recent years, the study of the peroxisome proliferators activated receptor gamma (PPAR-<svg style="vertical-align:-2.34499pt;width:8.0625px;" id="M2" height="9.9375" version="1.1" viewBox="0 0 8.0625 9.9375" width="8.0625"  xmlns="http://www.w3.org/2000/svg">
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</svg>) as a potential target for cancer prevention and therapy has gained a strong interest. However, the overall biological significance of PPAR-<svg style="vertical-align:-2.34499pt;width:8.0625px;" id="M3" height="9.9375" version="1.1" viewBox="0 0 8.0625 9.9375" width="8.0625"  xmlns="http://www.w3.org/2000/svg">
	<g transform="matrix(1.25,0,0,-1.25,0,9.9375)">
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</svg> in cancer development and progression is still controversial. While many reports documented antiproliferative effects in human cancer cell and animal models, several studies demonstrating potential tumor promoting actions of PPAR-<svg style="vertical-align:-2.34499pt;width:8.0625px;" id="M4" height="9.9375" version="1.1" viewBox="0 0 8.0625 9.9375" width="8.0625"  xmlns="http://www.w3.org/2000/svg">
	<g transform="matrix(1.25,0,0,-1.25,0,9.9375)">
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</svg> ligands raised considerable concerns about the role of PPAR-<svg style="vertical-align:-2.34499pt;width:8.0625px;" id="M5" height="9.9375" version="1.1" viewBox="0 0 8.0625 9.9375" width="8.0625"  xmlns="http://www.w3.org/2000/svg">
	<g transform="matrix(1.25,0,0,-1.25,0,9.9375)">
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</svg> in human cancers. Controversy also exists about the role of PPAR-<svg style="vertical-align:-2.34499pt;width:8.0625px;" id="M6" height="9.9375" version="1.1" viewBox="0 0 8.0625 9.9375" width="8.0625"  xmlns="http://www.w3.org/2000/svg">
	<g transform="matrix(1.25,0,0,-1.25,0,9.9375)">
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</svg> in human pancreatic cancers. The current review summarizes the data about PPAR-<svg style="vertical-align:-2.34499pt;width:8.0625px;" id="M7" height="9.9375" version="1.1" viewBox="0 0 8.0625 9.9375" width="8.0625"  xmlns="http://www.w3.org/2000/svg">
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Guido Eibl

The Role of PPAR-<svg style="vertical-align:-3.56265pt" height="12.175" version="1.1" viewBox="0 0 8.6374998 12.175" width="8.6374998" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns="http://www.w3.org/2000/svg"><g transform="matrix(.017,-0,0,-.017,.062,7.675)"><path id="x1D6FE" d="M478 372q0 -39 -31 -97t-61 -98t-78 -98q-45 -55 -73 -102q-13 -79 -13 -197q-11 -11 -43.5 -25.5t-53.5 -15.5l-15 17q5 35 26 101.5t47 123.5q8 72 -1.5 174.5t-37.5 178.5q-14 37 -29 37q-20 0 -67 -65l-25 21q37 60 73 90.5t63 30.5q47 0 72 -112q13 -56 17.5 -141.5t0.5 -143.5h2q155 193 155 297q0 26 -12 47q-5 8 -5 15q0 16 12.5 27t29.5 11q21 0 34 -21t13 -55z"/></g></svg> and Its Interaction with COX-2 in Pancreatic Cancer

Peroxisome proliferator-activated receptors (PPARs) are ligand binding transcription factors which function in many physiological roles including lipid metabolism, cell growth, differentiation, and apoptosis. PPARs and their ligands have been shown to play a role in cancer.  In particular, PPAR<svg style="vertical-align:-2.34499pt;width:8.0625px;" id="M2" height="9.9375" version="1.1" viewBox="0 0 8.0625 9.9375" width="8.0625"  xmlns="http://www.w3.org/2000/svg">
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</svg> ligands including endogenous prostaglandins and the synthetic thiazolidinediones (TZDs) can induce apoptosis of cancer cells with antitumor activity. Thus, PPAR<svg style="vertical-align:-2.34499pt;width:8.0625px;" id="M3" height="9.9375" version="1.1" viewBox="0 0 8.0625 9.9375" width="8.0625"  xmlns="http://www.w3.org/2000/svg">
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</svg> ligands have a potential in both chemoprevention and therapy of several types of cancer either as single agents or in combination with other antitumor agents. Accordingly, the involvement of PPAR<svg style="vertical-align:-2.34499pt;width:8.0625px;" id="M4" height="9.9375" version="1.1" viewBox="0 0 8.0625 9.9375" width="8.0625"  xmlns="http://www.w3.org/2000/svg">
	<g transform="matrix(1.25,0,0,-1.25,0,9.9375)">
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</svg> and its ligands in regulation of apoptosis of cancer cells have been extensively studied. Depending on cell types or ligands, induction of apoptosis in cancer cells by PPAR<svg style="vertical-align:-2.34499pt;width:8.0625px;" id="M5" height="9.9375" version="1.1" viewBox="0 0 8.0625 9.9375" width="8.0625"  xmlns="http://www.w3.org/2000/svg">
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</svg> ligands can be either PPAR<svg style="vertical-align:-2.34499pt;width:8.0625px;" id="M6" height="9.9375" version="1.1" viewBox="0 0 8.0625 9.9375" width="8.0625"  xmlns="http://www.w3.org/2000/svg">
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</svg>-dependent or -independent. Through increasing our understanding of the mechanisms of PPAR<svg style="vertical-align:-2.34499pt;width:8.0625px;" id="M7" height="9.9375" version="1.1" viewBox="0 0 8.0625 9.9375" width="8.0625"  xmlns="http://www.w3.org/2000/svg">
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		</g>
	</g>
</svg> ligand-induced apoptosis, we can develop better strategies which may include combining other antitumor agents for PPAR<svg style="vertical-align:-2.34499pt;width:8.0625px;" id="M8" height="9.9375" version="1.1" viewBox="0 0 8.0625 9.9375" width="8.0625"  xmlns="http://www.w3.org/2000/svg">
	<g transform="matrix(1.25,0,0,-1.25,0,9.9375)">
		<g transform="translate(72,-64.05)">
			<text transform="matrix(1,0,0,-1,-71.95,66.44)">
				<tspan style="font-size: 12.50px; " x="0" y="0">𝛾</tspan>
			</text>

		</g>
	</g>
</svg>-targeted cancer chemoprevention and therapy. This review will highlight recent research advances on PPAR<svg style="vertical-align:-2.34499pt;width:8.0625px;" id="M9" height="9.9375" version="1.1" viewBox="0 0 8.0625 9.9375" width="8.0625"  xmlns="http://www.w3.org/2000/svg">
	<g transform="matrix(1.25,0,0,-1.25,0,9.9375)">
		<g transform="translate(72,-64.05)">
			<text transform="matrix(1,0,0,-1,-71.95,66.44)">
				<tspan style="font-size: 12.50px; " x="0" y="0">𝛾</tspan>
			</text>

		</g>
	</g>
</svg> and apoptosis in cancer.

Heath A. Elrod

Shi-Yong Sun

PPAR<svg style="vertical-align:-3.56265pt" height="12.175" version="1.1" viewBox="0 0 8.6374998 12.175" width="8.6374998" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns="http://www.w3.org/2000/svg"><g transform="matrix(.017,-0,0,-.017,.062,7.675)"><path id="x1D6FE" d="M478 372q0 -39 -31 -97t-61 -98t-78 -98q-45 -55 -73 -102q-13 -79 -13 -197q-11 -11 -43.5 -25.5t-53.5 -15.5l-15 17q5 35 26 101.5t47 123.5q8 72 -1.5 174.5t-37.5 178.5q-14 37 -29 37q-20 0 -67 -65l-25 21q37 60 73 90.5t63 30.5q47 0 72 -112q13 -56 17.5 -141.5t0.5 -143.5h2q155 193 155 297q0 26 -12 47q-5 8 -5 15q0 16 12.5 27t29.5 11q21 0 34 -21t13 -55z"/></g></svg> and Apoptosis in Cancer

Peroxisome proliferator-activated receptor-gamma (PPAR<svg style="vertical-align:-2.34499pt;width:8.0625px;" id="M2" height="9.9375" version="1.1" viewBox="0 0 8.0625 9.9375" width="8.0625"  xmlns="http://www.w3.org/2000/svg">
	<g transform="matrix(1.25,0,0,-1.25,0,9.9375)">
		<g transform="translate(72,-64.05)">
			<text transform="matrix(1,0,0,-1,-71.95,66.44)">
				<tspan style="font-size: 12.50px; " x="0" y="0">𝛾</tspan>
			</text>

		</g>
	</g>
</svg>) exerts multiple functions in determination of cell fate, tissue metabolism, and host immunity. Two synthetic PPAR<svg style="vertical-align:-2.34499pt;width:8.0625px;" id="M3" height="9.9375" version="1.1" viewBox="0 0 8.0625 9.9375" width="8.0625"  xmlns="http://www.w3.org/2000/svg">
	<g transform="matrix(1.25,0,0,-1.25,0,9.9375)">
		<g transform="translate(72,-64.05)">
			<text transform="matrix(1,0,0,-1,-71.95,66.44)">
				<tspan style="font-size: 12.50px; " x="0" y="0">𝛾</tspan>
			</text>

		</g>
	</g>
</svg> ligands (rosiglitazone and pioglitazone) were approved for the therapy of type-2 diabetes mellitus and are expected to serve as novel cures for inflammatory diseases and cancer. However, PPAR<svg style="vertical-align:-2.34499pt;width:8.0625px;" id="M4" height="9.9375" version="1.1" viewBox="0 0 8.0625 9.9375" width="8.0625"  xmlns="http://www.w3.org/2000/svg">
	<g transform="matrix(1.25,0,0,-1.25,0,9.9375)">
		<g transform="translate(72,-64.05)">
			<text transform="matrix(1,0,0,-1,-71.95,66.44)">
				<tspan style="font-size: 12.50px; " x="0" y="0">𝛾</tspan>
			</text>

		</g>
	</g>
</svg> and its ligands exhibit a janus-face behaviour as tumor modulators in various systems, resulting in either tumor suppression or tumor promotion. This may be in part due to signaling crosstalk to the mitogen-activated protein kinase (MAPK) cascades. The genomic activity of PPAR<svg style="vertical-align:-2.34499pt;width:8.0625px;" id="M5" height="9.9375" version="1.1" viewBox="0 0 8.0625 9.9375" width="8.0625"  xmlns="http://www.w3.org/2000/svg">
	<g transform="matrix(1.25,0,0,-1.25,0,9.9375)">
		<g transform="translate(72,-64.05)">
			<text transform="matrix(1,0,0,-1,-71.95,66.44)">
				<tspan style="font-size: 12.50px; " x="0" y="0">𝛾</tspan>
			</text>

		</g>
	</g>
</svg> is modulated, in addition to ligand binding, by phosphorylation of a serine residue by MAPKs, such as extracellular signal-regulated protein kinases-1/2 (ERK-1/2), or by nucleocytoplasmic compartmentalization through the ERK activators MAPK kinases-1/2 (MEK-1/2). PPAR<svg style="vertical-align:-2.34499pt;width:8.0625px;" id="M6" height="9.9375" version="1.1" viewBox="0 0 8.0625 9.9375" width="8.0625"  xmlns="http://www.w3.org/2000/svg">
	<g transform="matrix(1.25,0,0,-1.25,0,9.9375)">
		<g transform="translate(72,-64.05)">
			<text transform="matrix(1,0,0,-1,-71.95,66.44)">
				<tspan style="font-size: 12.50px; " x="0" y="0">𝛾</tspan>
			</text>

		</g>
	</g>
</svg> ligands themselves activate the ERK cascade through nongenomic and often PPAR<svg style="vertical-align:-2.34499pt;width:8.0625px;" id="M7" height="9.9375" version="1.1" viewBox="0 0 8.0625 9.9375" width="8.0625"  xmlns="http://www.w3.org/2000/svg">
	<g transform="matrix(1.25,0,0,-1.25,0,9.9375)">
		<g transform="translate(72,-64.05)">
			<text transform="matrix(1,0,0,-1,-71.95,66.44)">
				<tspan style="font-size: 12.50px; " x="0" y="0">𝛾</tspan>
			</text>

		</g>
	</g>
</svg>-independent signaling. In the current review, we discuss the molecular mechanisms and physiological implications of the crosstalk of PPAR<svg style="vertical-align:-2.34499pt;width:8.0625px;" id="M8" height="9.9375" version="1.1" viewBox="0 0 8.0625 9.9375" width="8.0625"  xmlns="http://www.w3.org/2000/svg">
	<g transform="matrix(1.25,0,0,-1.25,0,9.9375)">
		<g transform="translate(72,-64.05)">
			<text transform="matrix(1,0,0,-1,-71.95,66.44)">
				<tspan style="font-size: 12.50px; " x="0" y="0">𝛾</tspan>
			</text>

		</g>
	</g>
</svg> with MEK-ERK signaling and its potential as a novel drug target for cancer therapy in patients.

Elke Burgermeister

Rony Seger

PPAR<svg style="vertical-align:-3.56265pt" height="12.175" version="1.1" viewBox="0 0 8.6374998 12.175" width="8.6374998" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns="http://www.w3.org/2000/svg"><g transform="matrix(.017,-0,0,-.017,.062,7.675)"><path id="x1D6FE" d="M478 372q0 -39 -31 -97t-61 -98t-78 -98q-45 -55 -73 -102q-13 -79 -13 -197q-11 -11 -43.5 -25.5t-53.5 -15.5l-15 17q5 35 26 101.5t47 123.5q8 72 -1.5 174.5t-37.5 178.5q-14 37 -29 37q-20 0 -67 -65l-25 21q37 60 73 90.5t63 30.5q47 0 72 -112q13 -56 17.5 -141.5t0.5 -143.5h2q155 193 155 297q0 26 -12 47q-5 8 -5 15q0 16 12.5 27t29.5 11q21 0 34 -21t13 -55z"/></g></svg> and MEK Interactions in Cancer

Peroxisome proliferator-activated receptors (PPARs) are ligand-activated 
                  transcription factors that belong to the nuclear hormone receptor superfamily. 
                  PPAR<svg style="vertical-align:-0.1254pt;width:8.9375px;" id="M1" height="7.1750002" version="1.1" viewBox="0 0 8.9375 7.1750002" width="8.9375"  xmlns="http://www.w3.org/2000/svg">
	<g transform="matrix(1.25,0,0,-1.25,0,7.175)">
		<g transform="translate(72,-66.26)">
			<text transform="matrix(1,0,0,-1,-71.95,66.44)">
				<tspan style="font-size: 12.50px; " x="0" y="0">𝛼</tspan>
			</text>

		</g>
	</g>
</svg> is mainly 
                  expressed in the liver, where it activates fatty acid catabolism. PPAR<svg style="vertical-align:-0.1254pt;width:8.9375px;" id="M2" height="7.1750002" version="1.1" viewBox="0 0 8.9375 7.1750002" width="8.9375"  xmlns="http://www.w3.org/2000/svg">
	<g transform="matrix(1.25,0,0,-1.25,0,7.175)">
		<g transform="translate(72,-66.26)">
			<text transform="matrix(1,0,0,-1,-71.95,66.44)">
				<tspan style="font-size: 12.50px; " x="0" y="0">𝛼</tspan>
			</text>

		</g>
	</g>
</svg> activators have been used to treat dyslipidemia, causing a reduction in plasma triglyceride 
                  and elevation of high-density lipoprotein cholesterol. PPAR<svg style="vertical-align:-0.13794pt;width:7.9875002px;" id="M3" height="10.7375" version="1.1" viewBox="0 0 7.9875002 10.7375" width="7.9875002"  xmlns="http://www.w3.org/2000/svg">
	<g transform="matrix(1.25,0,0,-1.25,0,10.7375)">
		<g transform="translate(72,-63.41)">
			<text transform="matrix(1,0,0,-1,-71.95,63.6)">
				<tspan style="font-size: 12.50px; " x="0" y="0">𝛿</tspan>
			</text>

		</g>
	</g>
</svg> is expressed ubiquitously and is 
                  implicated in fatty acid oxidation and keratinocyte differentiation. PPAR<svg style="vertical-align:-0.13794pt;width:7.9875002px;" id="M4" height="10.7375" version="1.1" viewBox="0 0 7.9875002 10.7375" width="7.9875002"  xmlns="http://www.w3.org/2000/svg">
	<g transform="matrix(1.25,0,0,-1.25,0,10.7375)">
		<g transform="translate(72,-63.41)">
			<text transform="matrix(1,0,0,-1,-71.95,63.6)">
				<tspan style="font-size: 12.50px; " x="0" y="0">𝛿</tspan>
			</text>

		</g>
	</g>
</svg> activators 
                  have been proposed for the treatment of metabolic disease. PPAR<svg style="vertical-align:-2.34499pt;width:8.0625px;" id="M5" height="9.9375" version="1.1" viewBox="0 0 8.0625 9.9375" width="8.0625"  xmlns="http://www.w3.org/2000/svg">
	<g transform="matrix(1.25,0,0,-1.25,0,9.9375)">
		<g transform="translate(72,-64.05)">
			<text transform="matrix(1,0,0,-1,-71.95,66.44)">
				<tspan style="font-size: 12.50px; " x="0" y="0">𝛾</tspan>
			</text>

		</g>
	</g>
</svg>2 is expressed 
                  exclusively in adipose tissue and plays a pivotal role in adipocyte differentiation. 
                  PPAR<svg style="vertical-align:-2.34499pt;width:8.0625px;" id="M6" height="9.9375" version="1.1" viewBox="0 0 8.0625 9.9375" width="8.0625"  xmlns="http://www.w3.org/2000/svg">
	<g transform="matrix(1.25,0,0,-1.25,0,9.9375)">
		<g transform="translate(72,-64.05)">
			<text transform="matrix(1,0,0,-1,-71.95,66.44)">
				<tspan style="font-size: 12.50px; " x="0" y="0">𝛾</tspan>
			</text>

		</g>
	</g>
</svg> is involved in glucose metabolism through the improvement of insulin sensitivity 
                  and represents a potential therapeutic target of type 2 diabetes. Thus PPARs are molecular 
                  targets for the development of drugs treating metabolic syndrome. However, PPARs also play 
                  a role in the regulation of cancer cell growth. Here, we review the function of PPARs in tumor 
                  growth.

Keisuke Tachibana

Daisuke Yamasaki

Kenji Ishimoto

Takefumi Doi

The Role of PPARs in Cancer

PPAR<svg style="vertical-align:-2.34499pt;width:8.0625px;" id="M3" height="9.9375" version="1.1" viewBox="0 0 8.0625 9.9375" width="8.0625"  xmlns="http://www.w3.org/2000/svg">
	<g transform="matrix(1.25,0,0,-1.25,0,9.9375)">
		<g transform="translate(72,-64.05)">
			<text transform="matrix(1,0,0,-1,-71.95,66.44)">
				<tspan style="font-size: 12.50px; " x="0" y="0">𝛾</tspan>
			</text>

		</g>
	</g>
</svg> and PPAR<svg style="vertical-align:-0.13794pt;width:7.9875002px;" id="M4" height="10.7375" version="1.1" viewBox="0 0 7.9875002 10.7375" width="7.9875002"  xmlns="http://www.w3.org/2000/svg">
	<g transform="matrix(1.25,0,0,-1.25,0,10.7375)">
		<g transform="translate(72,-63.41)">
			<text transform="matrix(1,0,0,-1,-71.95,63.6)">
				<tspan style="font-size: 12.50px; " x="0" y="0">𝛿</tspan>
			</text>

		</g>
	</g>
</svg> agonists represent unique classes of drugs that act through their ability to modulate gene transcription associated with intermediary metabolism, differentiation, tumor suppression, and in some instances proliferation and cell adhesion. PPAR<svg style="vertical-align:-2.34499pt;width:8.0625px;" id="M5" height="9.9375" version="1.1" viewBox="0 0 8.0625 9.9375" width="8.0625"  xmlns="http://www.w3.org/2000/svg">
	<g transform="matrix(1.25,0,0,-1.25,0,9.9375)">
		<g transform="translate(72,-64.05)">
			<text transform="matrix(1,0,0,-1,-71.95,66.44)">
				<tspan style="font-size: 12.50px; " x="0" y="0">𝛾</tspan>
			</text>

		</g>
	</g>
</svg> agonists are used by millions of people each year to treat type 2 diabetes but may also find additional utility as relatively nontoxic potentiators of chemotherapy. PPAR<svg style="vertical-align:-0.13794pt;width:7.9875002px;" id="M6" height="10.7375" version="1.1" viewBox="0 0 7.9875002 10.7375" width="7.9875002"  xmlns="http://www.w3.org/2000/svg">
	<g transform="matrix(1.25,0,0,-1.25,0,10.7375)">
		<g transform="translate(72,-63.41)">
			<text transform="matrix(1,0,0,-1,-71.95,63.6)">
				<tspan style="font-size: 12.50px; " x="0" y="0">𝛿</tspan>
			</text>

		</g>
	</g>
</svg> agonists produce complex actions as shown by their tumor promoting effects in rodents and their cholesterol-lowering action in dyslipidemias. There is now emerging evidence that PPARs regulate tumor suppressor genes and developmental pathways associated with transformation and cell fate determination. This review discusses the role of PPAR<svg style="vertical-align:-2.34499pt;width:8.0625px;" id="M7" height="9.9375" version="1.1" viewBox="0 0 8.0625 9.9375" width="8.0625"  xmlns="http://www.w3.org/2000/svg">
	<g transform="matrix(1.25,0,0,-1.25,0,9.9375)">
		<g transform="translate(72,-64.05)">
			<text transform="matrix(1,0,0,-1,-71.95,66.44)">
				<tspan style="font-size: 12.50px; " x="0" y="0">𝛾</tspan>
			</text>

		</g>
	</g>
</svg> and PPAR<svg style="vertical-align:-0.13794pt;width:7.9875002px;" id="M8" height="10.7375" version="1.1" viewBox="0 0 7.9875002 10.7375" width="7.9875002"  xmlns="http://www.w3.org/2000/svg">
	<g transform="matrix(1.25,0,0,-1.25,0,10.7375)">
		<g transform="translate(72,-63.41)">
			<text transform="matrix(1,0,0,-1,-71.95,63.6)">
				<tspan style="font-size: 12.50px; " x="0" y="0">𝛿</tspan>
			</text>

		</g>
	</g>
</svg> agonists as modulators of these processes.

Robert I. Glazer

Hongyan Yuan

Zhihui Xie

Yuzhi Yin

PPAR<svg style="vertical-align:-3.56265pt" height="12.175" version="1.1" viewBox="0 0 8.6374998 12.175" width="8.6374998" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns="http://www.w3.org/2000/svg"><g transform="matrix(.017,-0,0,-.017,.062,7.675)"><path id="x1D6FE" d="M478 372q0 -39 -31 -97t-61 -98t-78 -98q-45 -55 -73 -102q-13 -79 -13 -197q-11 -11 -43.5 -25.5t-53.5 -15.5l-15 17q5 35 26 101.5t47 123.5q8 72 -1.5 174.5t-37.5 178.5q-14 37 -29 37q-20 0 -67 -65l-25 21q37 60 73 90.5t63 30.5q47 0 72 -112q13 -56 17.5 -141.5&#xA;t0.5 -143.5h2q155 193 155 297q0 26 -12 47q-5 8 -5 15q0 16 12.5 27t29.5 11q21 0 34 -21t13 -55z" /></g></svg> and PPAR<svg style="vertical-align:-0.1638pt" height="12.4375" version="1.1" viewBox="0 0 8.9125004 12.4375" width="8.9125004" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns="http://www.w3.org/2000/svg"><g transform="matrix(.017,-0,0,-.017,.062,12.162)"><path id="x1D6FF" d="M494 514l-10 -15q-56 76 -106.5 117t-110.5 41q-45 0 -45 -30q0 -28 109 -152q59 -68 86 -118.5t27 -107.5q0 -62 -29.5 -119.5t-86.5 -96.5q-64 -45 -138 -45q-76 0 -121.5 53t-45.5 136q0 74 40.5 135t98.5 95q43 26 87 42q-40 59 -57.5 92t-17.5 62q0 46 39 77.5&#xA;t90 31.5q54 0 97.5 -35.5t65 -78.5t28.5 -84zM359 234q0 84 -90 191q-47 -17 -74 -47q-81 -89 -81 -200q0 -71 32.5 -109.5t72.5 -38.5q47 0 80 33t46.5 77.5t13.5 93.5z" /></g></svg> as Modulators of Neoplasia and Cell Fate

Peroxisome proliferator-activated receptor <svg style="vertical-align:-2.34499pt;width:8.0625px;" id="M2" height="9.9375" version="1.1" viewBox="0 0 8.0625 9.9375" width="8.0625"  xmlns="http://www.w3.org/2000/svg">
	<g transform="matrix(1.25,0,0,-1.25,0,9.9375)">
		<g transform="translate(72,-64.05)">
			<text transform="matrix(1,0,0,-1,-71.95,66.44)">
				<tspan style="font-size: 12.50px; " x="0" y="0">𝛾</tspan>
			</text>

		</g>
	</g>
</svg> (PPAR<svg style="vertical-align:-2.34499pt;width:8.0625px;" id="M3" height="9.9375" version="1.1" viewBox="0 0 8.0625 9.9375" width="8.0625"  xmlns="http://www.w3.org/2000/svg">
	<g transform="matrix(1.25,0,0,-1.25,0,9.9375)">
		<g transform="translate(72,-64.05)">
			<text transform="matrix(1,0,0,-1,-71.95,66.44)">
				<tspan style="font-size: 12.50px; " x="0" y="0">𝛾</tspan>
			</text>

		</g>
	</g>
</svg>) is a ligand-activated transcription factor and a member of the nuclear receptor superfamily. PPAR<svg style="vertical-align:-2.34499pt;width:8.0625px;" id="M4" height="9.9375" version="1.1" viewBox="0 0 8.0625 9.9375" width="8.0625"  xmlns="http://www.w3.org/2000/svg">
	<g transform="matrix(1.25,0,0,-1.25,0,9.9375)">
		<g transform="translate(72,-64.05)">
			<text transform="matrix(1,0,0,-1,-71.95,66.44)">
				<tspan style="font-size: 12.50px; " x="0" y="0">𝛾</tspan>
			</text>

		</g>
	</g>
</svg> and its ligands appear to serve diverse biological functions. In addition to the well-studied effects of PPAR<svg style="vertical-align:-2.34499pt;width:8.0625px;" id="M5" height="9.9375" version="1.1" viewBox="0 0 8.0625 9.9375" width="8.0625"  xmlns="http://www.w3.org/2000/svg">
	<g transform="matrix(1.25,0,0,-1.25,0,9.9375)">
		<g transform="translate(72,-64.05)">
			<text transform="matrix(1,0,0,-1,-71.95,66.44)">
				<tspan style="font-size: 12.50px; " x="0" y="0">𝛾</tspan>
			</text>

		</g>
	</g>
</svg> on metabolism and cellular differentiation, abundant evidence suggests that PPAR<svg style="vertical-align:-2.34499pt;width:8.0625px;" id="M6" height="9.9375" version="1.1" viewBox="0 0 8.0625 9.9375" width="8.0625"  xmlns="http://www.w3.org/2000/svg">
	<g transform="matrix(1.25,0,0,-1.25,0,9.9375)">
		<g transform="translate(72,-64.05)">
			<text transform="matrix(1,0,0,-1,-71.95,66.44)">
				<tspan style="font-size: 12.50px; " x="0" y="0">𝛾</tspan>
			</text>

		</g>
	</g>
</svg> is an important regulator of the immune system and cancers. Since cytokines are not only key modulators of inflammation with pro- and anti-inflammatory functions but they also can either stimulate or inhibit tumor growth and progression, this review summarizes the role for PPAR<svg style="vertical-align:-2.34499pt;width:8.0625px;" id="M7" height="9.9375" version="1.1" viewBox="0 0 8.0625 9.9375" width="8.0625"  xmlns="http://www.w3.org/2000/svg">
	<g transform="matrix(1.25,0,0,-1.25,0,9.9375)">
		<g transform="translate(72,-64.05)">
			<text transform="matrix(1,0,0,-1,-71.95,66.44)">
				<tspan style="font-size: 12.50px; " x="0" y="0">𝛾</tspan>
			</text>

		</g>
	</g>
</svg> in the regulation of cytokine production and cytokine-mediated signal transduction pathways in immune cells and cancer.

Xiao Yi Yang

Li Hua Wang

William L. Farrar

[Retracted] A Role for PPAR<svg style="vertical-align:-3.56265pt" height="12.175" version="1.1" viewBox="0 0 8.6374998 12.175" width="8.6374998" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns="http://www.w3.org/2000/svg"><g transform="matrix(.017,-0,0,-.017,.062,7.675)"><path id="x1D6FE" d="M478 372q0 -39 -31 -97t-61 -98t-78 -98q-45 -55 -73 -102q-13 -79 -13 -197q-11 -11 -43.5 -25.5t-53.5 -15.5l-15 17q5 35 26 101.5t47 123.5q8 72 -1.5 174.5t-37.5 178.5q-14 37 -29 37q-20 0 -67 -65l-25 21q37 60 73 90.5t63 30.5q47 0 72 -112q13 -56 17.5 -141.5
t0.5 -143.5h2q155 193 155 297q0 26 -12 47q-5 8 -5 15q0 16 12.5 27t29.5 11q21 0 34 -21t13 -55z" /></g></svg> in the Regulation of Cytokines in Immune Cells and Cancer

About this journal

<p><em>PPAR Research</em> publishes articles related to mechanisms involved in the activation of peroxisome proliferator-activated receptors, as well as their role in regulation of cellular differentiation, development, energy homeostasis and metabolic function.</p>


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Meet the editorial board

<p>Chief Editor, Dr Xiao-Jie Lu, is dedicated to basic and translational research on liver diseases. His research at Nanjing Medical University, China, focuses&nbsp;on exploring these diseases' underlying mechanisms that may be translatable to novel diagnostic biomarkers or therapeutic targets.</p>


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PPAR Research publishes articles related to mechanisms involved in the activation of peroxisome proliferator-activated receptors, as well as their role in regulation of cellular differentiation, development, energy homeostasis and metabolic function.

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PPAR Research | Hindawi

PPAR Research

<p>This Issue is now open for submissions.</p>
<p>Papers are published upon acceptance, regardless of the Special Issue publication date.</p>


PPAR Research

PPARs: A Double-Edged Sword in Cancer Therapy?

PPARs: A Double-Edged Sword in Cancer Therapy?

Articles

Pathophysiological Roles of PPAR in Gastrointestinal Epithelial Cells

Do PPAR Ligands Suppress the Growth of Cholangiocarcinoma or the Cholangiohepatitis Induced by the Tumor?

A Novel Mechanism of PPAR Regulation of TGF: Implication in Cancer Biology

Macrophages, PPARs, and Cancer

The Role of PPAR- and Its Interaction with COX-2 in Pancreatic Cancer

PPAR and Apoptosis in Cancer

PPAR and MEK Interactions in Cancer

The Role of PPARs in Cancer

PPAR and PPAR as Modulators of Neoplasia and Cell Fate

[Retracted] A Role for PPAR in the Regulation of Cytokines in Immune Cells and Cancer