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Journal of Obesity
Volume 2013 (2013), Article ID 312153, 7 pages
Maternal Docosahexaenoic Acid Increases Adiponectin and Normalizes IUGR-Induced Changes in Rat Adipose Deposition
1Division of Nutrition, University of Utah, Salt Lake City, UT 84158, USA
2Department of Pediatrics, University of Utah, Salt Lake City, UT 84158, USA
3Division of Neonatology, University of Utah, P.O. Box 581289, Salt Lake City, UT 84158, USA
Received 7 December 2012; Accepted 1 February 2013
Academic Editor: Nicola Abate
Copyright © 2013 Heidi N. Bagley et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
Intrauterine growth restriction (IUGR) predisposes to obesity and adipose dysfunction. We previously demonstrated IUGR-induced increased visceral adipose deposition and dysregulated expression of peroxisome proliferator activated receptor-γ2 (PPARγ2) in male adolescent rats, prior to the onset of obesity. In other studies, activation of PPARγ increases subcutaneous adiponectin expression and normalizes visceral adipose deposition. We hypothesized that maternal supplementation with docosahexaenoic acid (DHA), a PPARγ agonist, would normalize IUGR adipose deposition in association with increased PPARγ, adiponectin, and adiponectin receptor expression in subcutaneous adipose. To test these hypotheses, we used a well-characterized model of uteroplacental-insufficiency-(UPI-) induced IUGR in the rat with maternal DHA supplementation. Our primary findings were that maternal DHA supplementation during rat pregnancy and lactation (1) normalizes IUGR-induced changes in adipose deposition and visceral PPARγ expression in male rats and (2) increases serum adiponectin, as well as adipose expression of adiponectin and adiponectin receptors in former IUGR rats. Our novel findings suggest that maternal DHA supplementation may normalize adipose dysfunction and promote adiponectin-induced improvements in metabolic function in IUGR.
Intrauterine growth restriction (IUGR) predisposes to adult onset disease. The development of obesity following IUGR is well documented and results from adipose dysfunction [1–3]. While IUGR infants are smaller than their appropriately grown counterparts at birth, their rate of weight accretion is accelerated in childhood and they acquire more adipose tissue. An important concept is that IUGR adipose tissue is dysregulated before the onset of obesity [4, 5]. In addition to increased relative amounts of adipose tissue, adipose deposition in IUGR children favors formation of visceral adipose tissue (VAT) over subcutaneous adipose tissue (SAT) [6–8].
We previously demonstrated that IUGR increases the ratio of VAT to SAT in male adolescent rats, prior to the onset of obesity, with no effect in female rats . The changes in adipose deposition in IUGR were accompanied by increased expression of the adipogenic transcription factor peroxisome proliferator activated receptor-γ2 (PPARγ2) in VAT, but not SAT, of male rats .
An important transcriptional target of PPARγ is adiponectin [10, 11]. Adiponectin improves insulin sensitivity and normalizes adipose deposition . When mice with excessive VAT deposition overexpress adiponectin, VAT is redistributed to SAT in association with improved metabolic parameters . Interestingly, the same outcome occurs when obese mice are given a PPARγ agonist . PPARγ agonists, such as the long chain fatty acid (FA) docosahexaenoic acid (DHA), improve metabolic disease in both human and animal models and increase PPARγ mediated transcription of targets such as adiponectin [11, 13, 14].
The effects of adiponectin are imparted through one of its two receptors Adiponectin receptor 1 (AdipoR1) and adiponectin receptor 2 (AdipoR2) . AdipoR1 and AdipoR2 have been found to be decreased with obesity leading to reduced adiponectin sensitivity . Additionally, AdipoR1 and AdipoR2 are significantly decreased in adipose tissue of insulin resistant ob/ob mice when compared with control mice .
The effects of IUGR on adiponectin and adiponectin receptor expression in the rat are unknown. Also unknown are the effects of maternal DHA supplementation on adipose distribution, as well as expression of PPARγ, adiponectin, and adiponectin receptors in the context of IUGR. Because DHA activates PPARγ, we hypothesized that maternal DHA supplementation would normalize IUGR VAT and SAT levels in association with increased PPARγ, adiponectin, AdipoR1 and AdipoR2 expression in SAT. To test these hypotheses, we used a well-characterized model of uteroplacental-insufficiency-(UPI-) induced IUGR in the rat [9, 17, 18] and developed a model of maternal DHA supplementation in the context of the UPI-induced IUGR rat .
2. Materials and Methods
All procedures were approved by the University of Utah Animal Care Committee and are in accordance with the American Physiological Society’s guiding principles . IUGR was induced by uteroplacental insufficiency (UPI) in Sprague Dawley rats as previously described [9, 19, 21]. Briefly, on day 19 of gestation, pregnant Sprague-Dawley rats were anesthetized with intraperitoneal xylazine (8 mg/kg) and ketamine (40 mg/kg), and both uterine arteries ligated giving rise to IUGR pups. Control dams underwent identical anesthetic procedures. After recovery, rat dams had ad libitum access to food and water.
Maternal rats were allowed to deliver spontaneously at term; pups were weighed and litters randomly culled to six, to normalize postnatal nutrition. The pups remained with their mothers, feeding via lactation, until day 21 of postnatal life (d21). At d21, control and IUGR rat offspring underwent euthanasia using a sodium pentobarbital overdose (150 mg/kg), blood and serum were collected, and subcutaneous and retroperitoneal (a representative visceral depot) adipose was immediately harvested and flash frozen in liquid nitrogen.
2.2. Maternal DHA Supplementation
DHA was administered via a custom diet . The diet, based on Harlen Teklad 8640 standard rodent diet (TD.8640, Harlan-Teklad, WI), substitutes 1% of the soybean oil in the standard chow with 1% purified DHA (cis-docosahexaenoic acid, no. U-84-A, Nu-Chek Prep, MN). The resulting diet (here called 1% DHA diet) contains the same macronutrient content as standard rodent chow (21.8% protein, 40.8% carbohydrate, and 5.4% fat, with a resulting caloric density of 3 Kcal/g). DHA at 1% was chosen based on our previous studies demonstrating that maternal supplementation with 1% DHA was sufficient to increase pup DHA levels and to be associated with alterations in PPARγ in other tissues .
The pregnant rats were pair-fed regular diet or 1% DHA diet from E13 and through lactation. The continuation of the maternal diet is important to this study as the fatty acid composition of the maternal milk reflects the maternal dietary fatty acid profile [22, 23]. Each group (Control, IUGR and DHA-IUGR) consisted of 6 male and 6 female pups derived from different litters.
2.3. Magnetic Resonance Imaging
Magnetic resonance imaging (MRI) experiments were conducted using a Bruker Biospec 70/30 instrument (Billerica, MA) and a 72 mm-diameter birdcage radiofrequency (RF) transmit-receive resonator as previously described . ImageJ macros were created to automate the process of image analysis while still allowing manual intervention at key steps that were less amenable to automation [9, 24].
2.4. Serum Adiponectin Quantification
Serum adiponectin was quantified using an enzyme linked immunosorbent assay (ELISA) (Alpco Diagnostics, NH, (44-ADPRT-E01)) according to the manufacturer’s instructions.
2.5. Real-Time RT-PCR
Real-time reverse transcriptase polymerase chain reaction (RT-PCR) was used to evaluate mRNA levels in subcutaneous and visceral adipose tissue of adiponectin and adiponectin receptors as previously described [9, 19, 25]. The following Assay-on-demand primer/probe sets were used: PPARγ2-Rn00440940_m1, adiponectin-Rn00595250 m1, AdipoR1-Rn01483784 m1, and AdipoR2-Rn01463173 m1 (Applied Biosystems, CA, USA). GAPDH was used as an internal control (GAPDH primer and probe sequences; Forward: CAAGATGGTGAAGGTCGGTGT; Reverse: CAAGAGAAGGCAGCCCTGGT; Probe: GCGTCCGATACGGCCAAATCCG).
2.6. Protein Analysis
Adipose tissue levels of PPARγ2, AdoR1, and AdoR2 protein were quantified using immunoblotting as previously described [9, 19]. The following primary antibodies were used: PPARγ (H-100, sc-7196, Santa Cruz Biotechnology), AdipoR1 (Santa Cruz Biotechnology, CA, sc-46748), and AdipoR2 (Alpha Diagnostic International, TX, ApidoR21-A).
Data are presented as IUGR or DHA-IUGR relative to sex-matched controls ± SEM. Statistical significance was determined using ANOVA using the StatView 5 software package (SAS Institute, Inc.). was considered significant.
3.1. Body Weights
Control rat dams supplemented with DHA did not differ in body weight from control rat dams fed a regular diet. Similarly, IUGR rat dams supplemented with DHA did not differ in body weight from IUGR rat dams fed a regular diet. DHA diet also did not affect newborn pup weights for pups from either control dams or IUGR dams (Table 1). Consistent with previously published findings , IUGR pups weighed significantly less than control pups through d21. DHA-IUGR significantly increased body weight of male pups and normalized weight of female pups relative to regular diet controls (Figure 1(a)).
3.2. Adipose Tissue Distribution
Relative levels of VAT (retroperitoneal) and SAT were quantified from MRI images in male and female control, IUGR and DHA-IUGR rats at d21. Consistent with our previously published study, in male rats, IUGR increased levels of both SAT and VAT relative to regular diet control . In female rats, IUGR did not significantly alter levels of VAT or SAT (Figure 1(b)). DHA-IUGR did not significantly alter levels of VAT or SAT in either male or female rats relative to regular diet controls (Figure 1(b)).
3.3. PPARγ2 mRNA and Protein
Consistent with our previous study, PPARγ2 mRNA was unchanged in SAT and increased in VAT of male rats relative to male control rats. PPARγ2 mRNA was unchanged in female SAT or VAT relative to female control rats. PPARγ2 protein abundance was similarly increased in the VAT of male rats relative to male control. PPARγ2 protein abundance was unchanged in SAT or VAT of IUGR females. DHA-IUGR significantly increased PPARγ2 mRNA in SAT of male and female rats relative to sex-matched controls. DHA-IUGR did not significantly alter PPARγ2 protein abundance in male or female SAT or VAT (Figure 2).
3.4. Serum Adiponectin
IUGR did not affect serum adiponectin levels in either male or female rats relative to sex-matched controls. However, DHA-IUGR significantly increased serum adiponectin levels in male and female rats relative to sex-matched regular diet controls (Figure 3).
3.5. Adiponectin mRNA
Adiponectin mRNA was unaffected by IUGR in SAT and VAT of male or female rats. DHA-IUGR significantly increased adiponectin mRNA in SAT of male and female rats relative to regular diet controls. DHA-IUGR did not affect VAT levels of adiponectin mRNA in male or female rats (Figure 4).
3.6. AdipoR1 mRNA and Protein
In male rats, IUGR significantly increased AdipoR1 mRNA in VAT relative to male control VAT. IUGR did not alter AdipoR1 mRNA in SAT and VAT of female rats. AdipoR1 protein abundance was also unchanged by IUGR in SAT and VAT of male or female rats relative to sex-matched controls. DHA-IUGR significantly increased AdipoR1 mRNA in male SAT relative to male control SAT. DHA-IUGR did not affect AdipoR1 mRNA levels of female rats in VAT or SAT. DHA-IUGR significantly increased AdipoR1 protein levels in female SAT , with a trend towards significance in male SAT . Levels of AdipoR1 protein were undetectable in DHA-IUGR rat male and female VAT (Figure 5).
3.7. AdipoR2 mRNA and Protein
In male rats, IUGR significantly increased AdipoR2 mRNA in SAT relative to male control SAT. AdipoR2 mRNA was unaffected by IUGR in SAT or VAT of female rats. AdipoR2 protein was unaffected by IUGR in SAT and VAT of male or female rats. DHA-IUGR increased AdipoR2 mRNA in male and female SAT. DHA-IUGR AdipoR2 protein abundance was increased in male and female SAT (Figure 6).
Important findings of our study are twofold. Firstly, maternal DHA supplementation during rat pregnancy and lactation normalizes IUGR-induced changes in adipose deposition and visceral PPARγ expression in male rats. Secondly, maternal DHA supplementation increases serum adiponectin, as well as adipose expression of adiponectin and adiponectin receptors in former IUGR rats. Our novel findings suggest that maternal DHA supplementation may normalize adipose dysfunction and promote adiponectin-induced improvements in metabolic function in IUGR.
Individuals born IUGR develop adult obesity, with preferential VAT deposition, and insulin resistance [8, 26, 27]. Obesity, preferential VAT deposition, and insulin resistance have been demonstrated in IUGR animal models by our group and others [9, 28–31], often with a sex-specific bias [9, 29, 31]. A common theme amongst IUGR animal models is dysfunctional adipose gene expression that occurs prior to the onset of overt obesity. Our previous observation of increased VAT deposition in adolescent IUGR male rats is consistent with the subsequent development of insulin resistance in this model. This is because VAT and SAT contribute differently to the development of insulin resistance, with VAT being detrimental and SAT potentially conferring protective roles [12, 32, 33]. Normalization of VAT levels in IUGR males following maternal DHA supplementation may be metabolically protective in IUGR. Interestingly, while VAT levels normalized and SAT levels did not increase in IUGR-DHA male rat pups, DHA-IUGR male body weight was increased in our study. This may represent alterations in lean body mass accretion in DHA-IUGR pups.
Supplementation with DHA is physiologically relevant in IUGR. A maternal plasma FA profile low in DHA has been shown to be associated with small for gestational age (SGA) and preterm birth. Additionally, maternal supplementation with DHA during gestation is associated with longer gestation duration [34–36]. In our IUGR rat model, serum DHA is decreased in male neonatal rat pups compared to control, with no significant difference seen in females . The addition of DHA to the maternal diet increases serum DHA levels in male and female DHA-IUGR relative to control . In our model, improved DHA status normalizes VAT PPARγ2 levels in male IUGR rats and increases SAT PPARγ2 levels in both male and female IUGR rats. These findings are consistent with results of PPARγ activation in obese mice. In ob/ob mice, the synthetic PPARγ agonist, Rosiglitazone, results in a redistribution of adipose from VAT to SAT stores, with a concomitant resolution of metabolic disturbances . It is important to note however, that DHA may also help normalize adipose physiology by contributing to other mechanisms, including inhibition of inflammatory pathways [37, 38].
There is evidence that adiponectin may be the link between SAT PPARγ activation and subsequent ablation of metabolic disturbances. Adiponectin expression and release are higher in SAT compared with VAT . When systemically activated, SAT PPARγ prevents adipocyte hypertrophy by increasing the number of small adipocytes which increases adiponectin levels . In ob/ob mice, overexpression of adiponectin produces a similar effect to that of PPARγ activation, with adipose redistribution from VAT to SAT and normalization of metabolic disturbances . Adiponectin deficient mice have increased insulin resistance [41, 42]. Interestingly, obese humans express significantly lower levels of adiponectin even though adiponectin is expressed solely by adipose tissue . Of note, children who are born IUGR also have lower circulating adiponectin at birth [43, 44]. Increased serum adiponectin, especially in individuals who have a predisposition to be insulin resistant, such as those born IUGR, may improve insulin sensitivity.
In addition to increased serum adiponectin, maternal DHA supplementation increased expression of AdipoR1 and AdipoR2 in SAT in our study. AdipoR1 and AdipoR2 play physiologically important roles in the regulation of insulin sensitivity and glucose metabolism in vivo . Obese, insulin resistant mice have decreased expression of adiponectin receptors in adipose tissue (23). The decreased expression of adiponectin receptors is associated with a reduction in the insulin-sensitizing effects of adiponectin. Increasing AdipoR1 and/or AdipoR2 may enhance adiponectin binding capacities in adipose cells and in turn may lead to an increase in the adiponectin effects, even without change in adiponectin levels . Overexpression of AdipoR1 and AdipoR2 in ob/ob mice normalizes insulin signaling . Therefore, DHA-induced increases in both adiponectin as well as its receptors observed in this study may lead to the greatest degree of insulin sensitizing through adiponectin signaling mechanisms.
Our study is not without limitations. First, while we assessed the expression of adiponectin and AdipoR’s in adipose tissue, we did not assess adiponectin signaling. An understanding of the downstream consequences of AdipoR activation in IUGR with and without DHA supplementation is important and warrants further investigation. Secondly, while we demonstrated improvement in adipose deposition and increased adiponectin with DHA supplementation in IUGR, we did not assess the effect of DHA supplementation on the development of insulin resistance in this model. Future studies are required to assess the effects of maternal DHA supplementation during gestation and lactation on the development of insulin resistance in IUGR rats. We also did not differentiate between prenatal DHA effects and postnatal DHA effects. Determining the minimum window in which DHA may be effective will be important to enhance the translational relevance of our study.
In conclusion, maternal DHA supplementation increases adiponectin and adiponectin receptor expression in SAT of IUGR rats. We speculate that increased adiponectin production may improve insulin sensitivity in IUGR rats. Our study suggests that early DHA supplementation may provide a means of tempering adipose dysregulation and subsequent metabolic disturbances in IUGR individuals.
Conflict of Interests
None of the authors have any conflict of interests.
The authors would like to acknowledge the Division of Neonatology for support and the University of Utah, Small Animal Imaging Facility for MRI scans. This study was supported by the NIH (K01-DK080558 (L. Joss-Moore) and R03-DK095970 (L. Joss-Moore)).
- M. G. Ross and M. H. Beall, “Adult Sequelae of Intrauterine Growth Restriction,” Seminars in Perinatology, vol. 32, no. 3, pp. 213–218, 2008.
- E. C. Cottrell and S. E. Ozanne, “Early life programming of obesity and metabolic disease,” Physiology and Behavior, vol. 94, no. 1, pp. 17–28, 2008.
- J. C. K. Wells, S. Chomtho, and M. S. Fewtrell, “Programming of body composition by early growth and nutrition,” Proceedings of the Nutrition Society, vol. 66, no. 3, pp. 423–434, 2007.
- S. Chakraborty, D. V. Joseph, M. J. G. Bankart, S. A. Petersen, and M. P. Wailoo, “Fetal growth restriction: relation to growth and obesity at the age of 9 years,” Archives of Disease in Childhood, vol. 92, no. 6, pp. F479–F483, 2007.
- D. Jaquet, S. Deghmoun, D. Chevenne, D. Collin, P. Czernichow, and C. Lévy-Marchal, “Dynamic change in adiposity from fetal to postnatal life is involved in the metabolic syndrome associated with reduced fetal growth,” Diabetologia, vol. 48, no. 5, pp. 849–855, 2005.
- E. L. Rasmussen, C. Malis, C. B. Jensen et al., “Altered fat tissue distribution in young adult men who had low birth weight,” Diabetes Care, vol. 28, no. 1, pp. 151–153, 2005.
- L. Ibáñez, A. Lopez-Bermejo, L. Suárez, M. V. Marcos, M. Díaz, and F. De Zegher, “Visceral adiposity without overweight in children born small for gestational age,” Journal of Clinical Endocrinology and Metabolism, vol. 93, no. 6, pp. 2079–2083, 2008.
- C. S. Yajnik, H. G. Lubree, S. S. Rege et al., “Adiposity and hyperinsulinemia in Indians are present at birth,” Journal of Clinical Endocrinology and Metabolism, vol. 87, no. 12, pp. 5575–5580, 2002.
- L. A. Joss-Moore, Y. Wang, M. S. Campbell et al., “Uteroplacental insufficiency increases visceral adiposity and visceral adipose PPARγ2 expression in male rat offspring prior to the onset of obesity,” Early Human Development, vol. 86, no. 3, pp. 179–185, 2010.
- A. Banga, R. Unal, P. Tripathi et al., “Adiponectin translation is increased by the PPARγ agonists pioglitazone and ω-3 fatty acids,” American Journal of Physiology, vol. 296, no. 3, pp. E480–E489, 2009.
- G. Krey, O. Braissant, F. L'Horset et al., “Fatty acids, eicosanoids, and hypolipidemic agents identified as ligands of peroxisome proliferator-activated receptors by coactivator-dependent receptor ligand assay,” Molecular Endocrinology, vol. 11, no. 6, pp. 779–791, 1997.
- J. Kim, E. Van De Wall, M. Laplante et al., “Obesity-associated improvements in metabolic profile through expansion of adipose tissue,” Journal of Clinical Investigation, vol. 117, no. 9, pp. 2621–2637, 2007.
- P. R. Devchand, A. Ijpenberg, B. Devesvergne, and W. Wahli, “PPARs: nuclear receptors for fatty acids, eicosanoids, and xenobiotics,” Advances in Experimental Medicine and Biology, vol. 469, pp. 231–236, 2000.
- P. Flachs, O. Horakova, P. Brauner et al., “Polyunsaturated fatty acids of marine origin upregulate mitochondrial biogenesis and induce β-oxidation in white fat,” Diabetologia, vol. 48, no. 11, pp. 2365–2375, 2005.
- C. Stryjecki and D. M. Mutch, “Fatty acid-gene interactions, adipokines and obesity,” European Journal of Clinical Nutrition, vol. 65, no. 3, pp. 285–297, 2011.
- T. Kadowaki and T. Yamauchi, “Adiponectin and adiponectin receptors,” Endocrine Reviews, vol. 26, no. 3, pp. 439–451, 2005.
- R. H. Lane, A. E. Tsirka, and E. M. Gruetzmacher, “Uteroplacental insufficiency alters cerebral mitochondrial gene expression and DNA in fetal and juvenile rats,” Pediatric Research, vol. 47, no. 6, pp. 792–797, 2000.
- E. S. Ogata, M. E. Bussey, and S. Finley, “Altered gas exchange, limited glucose and branched chain amino acids, and hypoinsulinism retard fetal growth in the rat,” Metabolism, vol. 35, no. 10, pp. 970–977, 1986.
- L. A. Joss-Moore, Y. Wang, M. L. Baack et al., “IUGR decreases PPARγ and SETD8 Expression in neonatal rat lung and these effects are ameliorated by maternal DHA supplementation,” Early Human Development, vol. 86, no. 12, pp. 785–791, 2010.
- APS, “Guiding principles for research involving animals and human beings,” American Journal of Physiology, vol. 283, no. 2, pp. R281–R283, 2002.
- M. Baserga, A. L. Bares, M. A. Hale et al., “Uteroplacental insufficiency affects kidney VEGF expression in a model of IUGR with compensatory glomerular hypertrophy and hypertension,” Early Human Development, vol. 85, no. 6, pp. 361–367, 2009.
- F. Scopesi, S. Ciangherotti, P. B. Lantieri et al., “Maternal dietary PUFAs intake and human milk content relationships during the first month of lactation,” Clinical Nutrition, vol. 20, no. 5, pp. 393–397, 2001.
- E. Amusquivar and E. Herrera, “Influence of changes in dietary fatty acids during pregnancy on placental and fetal fatty acid profile in the rat,” Biology of the Neonate, vol. 83, no. 2, pp. 136–145, 2003.
- M. D. Abramoff, P. J. Magelhaes, and S. J. Ram, “Image processing with ImageJ,” Biophotonics International, vol. 11, no. 7, pp. 36–42, 2004.
- L. A. Joss-Moore, Y. Wang, E. M. Ogata et al., “IUGR differentially alters MeCP2 expression and H3K9Me3 of the PPARγ gene in male and female rat lungs during alveolarization,” Birth Defects Research A, vol. 91, no. 8, pp. 672–681, 2011.
- L. Ibáñez, G. Sebastiani, A. Lopez-Bermejo, M. Díaz, M. D. Gómez-Roig, and F. De Zegher, “Gender specificity of body adiposity and circulating adiponectin, visfatin, insulin, and insulin growth factor-I at term birth: relation to prenatal growth,” Journal of Clinical Endocrinology and Metabolism, vol. 93, no. 7, pp. 2774–2778, 2008.
- F. Rasmussen, M. Kark, S. Tholin, N. Karnehed, and P. Tynelius, “The Swedish young male twins study: a resource for longitudinal research on risk factors for obesity and cardiovascular diseases,” Twin Research and Human Genetics, vol. 9, no. 6, pp. 883–889, 2006.
- M. Desai, J. Babu, and M. G. Ross, “Programmed metabolic syndrome: prenatal undernutrition and postweaning overnutrition,” American Journal of Physiology, vol. 293, no. 6, pp. R2306–R2314, 2007.
- J. A. Owens, P. Thavaneswaran, M. J. De Blasio, I. C. McMillen, J. S. Robinson, and K. L. Gatford, “Sex-specific effects of placental restriction on components of the metabolic syndrome in young adult sheep,” American Journal of Physiology, vol. 292, no. 6, pp. E1879–E1889, 2007.
- S. Louey, M. L. Cock, and R. Harding, “Long term consequences of low birthweight on postnatal growth, adiposity and brain weight at maturity in sheep,” Journal of Reproduction and Development, vol. 51, no. 1, pp. 59–68, 2005.
- G. Y. Choi, D. N. Tosh, A. Garg, R. Mansano, M. G. Ross, and M. Desai, “Gender-specific programmed hepatic lipid dysregulation in intrauterine growth-restricted offspring,” American Journal of Obstetrics and Gynecology, vol. 196, no. 5, pp. 477.e1–477.e7, 2007.
- G. Medina-Gomez, S. L. Gray, L. Yetukuri et al., “PPAR gamma 2 prevents lipotoxicity by controlling adipose tissue expandability and peripheral lipid metabolism.,” PLoS Genetics, vol. 3, no. 4, article e64, 2007.
- T. T. Tran, Y. Yamamoto, S. Gesta, and C. R. Kahn, “Beneficial effects of subcutaneous fat transplantation on metabolism,” Cell Metabolism, vol. 7, no. 5, pp. 410–420, 2008.
- M. S. Reece, J. A. McGregor, K. G. Allen, and M. A. Harris, “Maternal and perinatal long-chain fatty acids: possible roles in preterm birth,” American Journal of Obstetrics and Gynecology, vol. 176, no. 4, pp. 907–914, 1997.
- M. Van Eijsden, G. Hornstra, M. F. Van Der Wal, T. G. M. Vrijkotte, and G. J. Bonsel, “Maternal n-3, n-6, and trans fatty acid profile early in pregnancy and term birth weight: a prospective cohort study,” American Journal of Clinical Nutrition, vol. 87, no. 4, pp. 887–895, 2008.
- S. F. Olsen, M. L. Osterdal, J. D. Salvig, T. Weber, A. Tabor, and N. J. Secher, “Duration of pregnancy in relation to fish oil supplementation and habitual fish intake: a randomised clinical trial with fish oil,” European Journal of Clinical Nutrition, vol. 61, no. 8, pp. 976–985, 2007.
- B. K. Itariu, M. Zeyda, E. E. Hochbrugger et al., “Long-chain n-3 PUFAs reduce adipose tissue and systemic inflammation in severely obese nondiabetic patients: a randomized controlled trial,” The American Journal of Clinical Nutrition, vol. 96, no. 5, pp. 1137–1149, 2012.
- A. Neuhofer, M. Zeyda, D. Mascher et al., “Impaired local production of pro-resolving lipid mediators in obesity and 17-HDHA as a potential treatment for obesity-associated inflammation,” Diabetes, 2013.
- P. K. Sharma, A. Bhansali, R. Sialy, S. Malhotra, and P. Pandhi, “Effects of pioglitazone and metformin on plasma adiponectin in newly detected type 2 diabetes mellitus,” Clinical Endocrinology, vol. 65, no. 6, pp. 722–728, 2006.
- A. Tsuchida, T. Yamauchi, S. Takekawa et al., “Peroxisome proliferator-activated receptor (PPAR)α activation increases adiponectin receptors and reduces obesity-related inflammation in adipose tissue: comparison of activation of PPARα, PPARγ, and their combination,” Diabetes, vol. 54, no. 12, pp. 3358–3370, 2005.
- P. A. Kern, G. B. Di Gregorio, T. Lu, N. Rassouli, and G. Ranganathan, “Adiponectin expression from human adipose tissue: relation to obesity, insulin resistance, and tumor necrosis factor-α expression,” Diabetes, vol. 52, no. 7, pp. 1779–1785, 2003.
- N. Rasouli and P. A. Kern, “Adipocytokines and the metabolic complications of obesity,” Journal of Clinical Endocrinology and Metabolism, vol. 93, no. 11, supplement, pp. s64–s73, 2008.
- D. D. Briana and A. Malamitsi-Puchner, “Intrauterine growth restriction and adult disease: the role of adipocytokines,” European Journal of Endocrinology, vol. 160, no. 3, pp. 337–347, 2009.
- A. López-Bermejo, “Insulin resistance after prenatal growth restriction: is it mediated by adiponectin deficiency?” Clinical Endocrinology, vol. 64, no. 5, pp. 479–480, 2006.
- T. Yamauchi and T. Kadowaki, “Physiological and pathophysiological roles of adiponectin and adiponectin receptors in the integrated regulation of metabolic and cardiovascular diseases,” International Journal of Obesity, vol. 32, no. 7, pp. S13–S18, 2008.
- C. Kim, J. Park, J. Park et al., “Comparison of body fat composition and serum adiponectin levels in diabetic obesity and non-diabetic obesity,” Obesity, vol. 14, no. 7, pp. 1164–1171, 2006.
- S. Perrini, L. Laviola, A. Cignarelli et al., “Fat depot-related differences in gene expression, adiponectin secretion, and insulin action and signalling in human adipocytes differentiated in vitro from precursor stromal cells,” Diabetologia, vol. 51, no. 1, pp. 155–164, 2008.