Insights into the Roles of Midazolam in Cancer Therapy

Jiao, Jinghua; Wang, Yuheng; Sun, Xiaofeng; Jiang, Xiaojing

doi:https://doi.org/10.1155/2017/3826506

Evidence-Based Complementary and Alternative Medicine

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Abstract Introduction Results and Discussion Conflicts of Interest Acknowledgments References Copyright Related Articles

Research Article | Open Access

Volume 2017 | Article ID 3826506 | https://doi.org/10.1155/2017/3826506

Insights into the Roles of Midazolam in Cancer Therapy

Jinghua Jiao,^1,2Yuheng Wang,²Xiaofeng Sun,²and Xiaojing Jiang¹

Academic Editor: Shuang-En Chuang

Received21 Mar 2017

Revised15 May 2017

Accepted28 May 2017

Published19 Jun 2017

Abstract

With its high worldwide mortality and morbidity, cancer has gained increasing attention and novel anticancer drugs have become the focus for cancer research. Recently, studies have shown that most anesthetic agents can influence the activity of tumor cells. Midazolam is a γ-aminobutyric acid A () receptor agonist, used widely for preoperative sedation and as an adjuvant during neuraxial blockade. Some studies have indicated the potential for midazolam as a novel therapeutic cancer drug; however, the mechanism by which midazolam affects cancer cells needs to be clarified. This systematic review aims to summarize the progress in assessing the molecular mechanism of midazolam as an anticancer agent.

1. Introduction

Cancer has become the most common disease worldwide and is the leading cause of death [1]. Currently, the primary treatment for a solid tumor is still surgical resection. During surgery, anesthesia and the drugs used may affect the tumor and result in the release of tumor cells into the blood, lymphatic system, bone marrow, and even organs, leading to the formation of micrometastatic lesions, an increased risk of tumor recurrence and metastasis, and ultimately affecting postoperative survival rate [2, 3]. A number of in vitro studies have confirmed that most anesthetic agents, including midazolam, have substantial antitumor effects [4–6]. To date, a few studies have used various cell lines to determine the mechanism underlying the effect of midazolam on cancer cells. However, this mechanism is multifaceted and the means by which midazolam affects a variety of cancer signaling pathways needs to be clarified. This article reviews the biochemical properties of midazolam, its activity, its antitumor properties, and the possible mechanisms involved. We hope to provide a theoretical basis for the potential clinical application of midazolam as a therapeutic agent for tumors.

2. Chemistry and Clinical Pharmacology of Midazolam

The chemical structure of midazolam (dormicum) is 8-chloro-6-(2-fluorophenyl)-1-methyl-4H-imidazo[1,5-a][1,4]benzodiazepine (Figure 1).

As a benzodiazepine, anticonvulsant drug, midazolam has a rapid onset and short-lasting effect. In addition, midazolam has significant hypnotic, anxiolytic, amnesic, and sedative properties and these occur via modulation of the receptor in the central nervous system [7, 8]. In the clinical situation, midazolam is the current drug of choice for sedation, including preoperative sedation. For patients undergoing caesarean section under spinal anesthesia, midazolam is effective for the prevention of nausea and vomiting [9] and produces postoperative pain relief [10].

However, midazolam was recently reported to be among the 20 most often utilized medications in cancer patients to be associated with toxic side effects [11]. In addition, it has been shown to have neuronal cytotoxicity and apoptosis-inducing activity in hematogenic, ectodermal, mesenchymal, and neuronal cells [12–15].

3. Systematic Review

3.1. Search Strategy

A systematic and comprehensive literature search was performed by two authors (J.J.H. and J.X.J.) independently and using the PubMed, Embase, Web of Science, Ovid evidence-based medicine, Chinese science and technology periodicals (CNKI, VIP, and Wan Fang), and Chinese Biomedical Literature (CBM) databases, for publications up to March 5, 2017. Disagreement between reviewers was resolved by discussion. The following terms were used in each search: cancer, carcinoma, neoplasm, tumor, midazolam, dormicum, and 8-chloro-6-(2-fluorophenyl)-1-methyl-4H-imidazo[1,5-a][1,4]benzodiazepine. The results were limited to English or Chinese language.

3.2. Inclusion and Exclusion Criteria

Any study that clearly stated a link between midazolam and cancer, both in vitro and in vivo, was included. Studies were excluded based on the following criteria: (1) conference abstracts, reviews, conference papers, case reports, editorials, comments, news, congresses, and letters; (2) non-English or Chinese.

3.3. Quality Assessment and Data Extraction

The quality of all eligible studies was assessed by two independent reviewers using the EBLIP Critical Appraisal Checklist [16]. The extracted data from included studies are shown in Table 1.

4. Results and Discussion

A total of 822 studies were identified in PubMed, Embase, Web of Science, Ovid evidence-based medicine, Chinese science and technology periodicals (CNKI, VIP, and Wan Fang), and Chinese Biomedical Literature (CBM) using our search strategy. After detailed screening, 12 studies were considered eligible for inclusion in this review (summarized in Figure 2).

4.1. Possible Antitumor Mechanisms of Midazolam In Vitro

There are thirty-three trillion cells in the human body and numerous cellular functions that maintain the balance of these cells. In disease situations, this balance may be disrupted by multiple external stimuli, stress, and the generation of mutant cells [17]. Cell death plays an important role in maintaining cellular balance by removing cells that are “unnecessary” or potentially harmful [18] and may occur via two means, necrosis and apoptosis. Apoptosis is a programmed cell death, whereas necrosis is an “accidental” death resulting from a physical or chemical assault [19]. During the process of necrosis, the cell membrane is distorted and the cell nucleus disintegrates resulting in degradation products. Apoptosis, on the other hand, is a far more regulated process that results in the cell degenerating into contained apoptotic bodies that can be phagocytosed and removed.

4.2. Induction of Apoptosis

Apoptosis plays a crucial role in eliminating cells that are unnecessary or harmful and it also has a role in numerous biological processes, including cell differentiation and proliferation [20, 21]. With respect to cancer, apoptosis has become a popular target for many treatment strategies as there is a close relationship with apoptosis and many of the processes involved in cancer progression [22–27].

Previous studies using flow cytometry showed that midazolam induced apoptosis in the human lymphoma and neuroblastoma cell lines, MA-10 Leydig tumor cells, and the mantle cell lymphoma cell line, JeKo-1, in a concentration-dependent manner [12, 29, 37]. Potential biomarkers of apoptosis include B cell lymphoma 2 (Bcl-2) family proteins, caspase-3, and caspase-9. In the mantle cell lymphoma cell line, JeKo-1, a dose-dependent reduction of Bcl-2, procaspase-9 and procaspase-3 protein expression and an increase in cyto-C protein expression were found. The expression of procaspase-8 protein did not change. It was concluded that midazolam potentially initiates the mitochondrial pathway, not the death receptor pathway, by reducing the expression of Bcl-2, leading in turn to the release of cyto-C in mitochondria. This leads to the activation of caspase 9 and caspase 3 protein and triggers the caspase cascade, ultimately leading to the induction of apoptosis in the JeKo-1 cells [37].

However, in the human lymphoma and neuroblastoma cell lines, Bcl-2 overexpression and caspase 9 deficiency protected against midazolam toxicity, whereas a deficiency in caspase 8 or Fas-associating protein with a novel death domain (FADD) had no effect. Although pancaspase inhibition had a strong protective effect, flumazenil could not inhibit midazolam-induced apoptosis. Midazolam induced apoptosis via activation of the mitochondrial pathway in a concentration-dependent manner. The induction of apoptosis by midazolam is presumably unrelated to receptor pathway signaling [12].

The endoplasmic reticulum stress (ER stress) pathway, also known as the Unfolded Protein Response, is the response of the cell to a dangerous buildup of unfolded or misfolded proteins in the ER [39–41]. C/EBP-homologous protein (CHOP), activating transcription factor 4 (ATF-4), and phosphorylated α subunit of eukaryotic initiation factor 2 (p-eIF2α) are typical ER stress markers [42]. eIF2α/ATF4/CHOP is an essential signal pathway regulating ER stress [43]. In MA-10 Leydig tumor cells, where apoptosis is induced with midazolam, the overexpression of p-eIF2α, ATF4, ATF3, and CHOP was observed, suggesting that midazolam may induce apoptosis via the ER stress pathway [31]. Midazolam was also suggested to induce the activation of caspase-8, caspase-9, and caspase-3 and poly(ADP-ribose) polymerase proteins in the mouse Leydig tumor cells. There were no changes in the levels of Bcl-2 associated X protein (Bax) (a proapoptotic family member) [44], but Bid (also proapoptotic and which is activated by various death stimuli) was significantly decreased after midazolam intervention [45, 46]. Midazolam decreases the expression of pAkt and Akt and upregulates the phosphorylation of p38 and c-Jun NH2-terminal kinase, rather than extracellular signal-regulated kinases [29]. Thus, midazolam-induced apoptosis may be induced via the activation of the caspase cascade, the inhibition of the pAkt pathway, and the induction of p38 and c-Jun NH2-terminal kinase pathways [29].

4.3. Necrosis

In decreasing order, midazolam showed the greatest toxicity for HL-60 cells, epidermal keratinocytes, oral squamous cell carcinoma (OSCC), and glioblastoma cells. Midazolam did not induce the generation of apoptosis markers in OSCC cells (including DNA cleavage between nucleosomes and activation of caspase-3, caspase-8, and caspase-9) but did induce many vacuoles, mitochondrial swelling, and cell membrane rupture [32]. Midazolam cytotoxicity for human lymphoma and neuroblastoma cell lines affected a switch from caspase-dependent apoptosis to necrosis as the concentration increased [12].

4.4. Autophagy

Autophagy is a newly recognized innate defense mechanism that has been observed in cancer and is a physiological program that enables the body to deal with the destruction of cells [47]. Autophagy maintains a homeostatic balance via protein degradation and the turnover of destroyed cellular organelles [48]. Autophagy was not induced with midazolam as midazolam cytotoxicity was not reduced by pretreatment with autophagy inhibitors (3-methyladenine and bafilomycin A1) in the OSCC cell lines [30]. Thus, midazolam appears to induce necrosis, and not apoptosis or autophagy, in OSCC cell lines.

However, in MA-10 cells, the staining and expression of LC3-phosphatidylethanolamine conjugate (LC3-II), which is recruited to autophagosomal membranes, was observed following midazolam treatment, suggesting that midazolam induced autophagy in MA-10 cells [31].

4.5. Effect on the Cell Cycle

The rate of cell proliferation is always determined by cell cycle distribution. There are four phases in the cell cycle including G1, G2, S, and M; G1 and G2 phases are gap phases; S phase is the synthesis phase during which the genetic material is duplicated; and the M phase is where mitosis partitions the genetic material and the cell divides [49, 50]. As the genetic material is duplicated in the S phase, the percentage of cells in this phase also reflects the rate of proliferating cells. As the balance between proliferation and apoptosis is destroyed in tumor cells, the percentage of tumor cells in the S phase is much larger than that in normal cells from the same tissues or organs [51].

Another study that looked at the effect of midazolam in mouse Leydig tumor cells showed an accumulation of MA-10 cells in the sub-G₁ phase and a reduction of cells in the G₂/M phase in a time- and dose-dependent manner [29]. It was suggested that midazolam may inhibit the expression of cyclin-A, cyclin-B, and cyclin-dependent kinase 1 (CDK1) in MA-10 cells and alter the phosphorylation of P21, P27, and p53, thus controlling the cell cycle through the regulation of the p53 pathway [31].

On the other hand, a study by Dou and coworkers showed that midazolam triggered G₀/G₁ cell cycle arrest in the human head and neck squamous carcinoma FaDu cell line by regulating cell cycle regulators [34].

4.6. Inhibition of Proliferation

The human E1A binding protein, p300, also known as EP300 or p300, is encoded by the EP300 gene and regulates the activity of many genes in tissues throughout the body [52]. It plays an essential role in regulating cell growth and division, prompting cells to mature, differentiate, and assume specialized functions, and preventing the growth of cancerous tumors [53]. The p300 protein appears to be critical for normal development before and after birth. The p300 protein carries out its function by activating transcription, the process of translating the genetic blueprint into protein production. Specifically, p300 connects transcription factors and proteins that initiate the transcription process with numerous proteins that carry out the transcription process in the cell’s nucleus [54].

Midazolam was shown to inhibit the proliferation of FaDu cells, a cell line from a squamous cell carcinoma of the hypopharynx, and attenuated the mRNA and protein levels of p300. The knockdown of p300 resulted in an upregulation of p21 and p27 proteins and downregulation of p-Rb protein. Thus, it appeared that midazolam inhibited the proliferation of FaDu cells via downregulation of p300 expression [33].

Similarly, another study on FaDu cells showed that midazolam was able to inhibit the growth and proliferation of FaDu cells [34]. However, this study reported that the inhibition of FaDu cell proliferation was mediated by the targeting of transient receptor potential melastatin 7 (TRPM7). TRPM7, which is expressed in human head and neck squamous carcinoma cells, is one of the TRP channel family members. The growth and proliferation of FaDu cell lines can be inhibited by the inhibition of TRPM7 expression or blocking of TRPM7 channels [55]. Similar results were found in a malignant glioblastoma cell line, T98-MG cell [36].

A further study demonstrated that midazolam inhibited the growth and proliferation of SW480 colonic adenocarcinoma cells in a time- and dose-dependent manner and downregulated ubiquitin-specific protease 22 (USP22) expression. With the use of USP22 small interfering RNA (Si-RNA), they were able to silence USP22 expression and found that SW480 cell proliferation was inhibited, while P21 and P27 expression was upregulated, and pRB downregulated. Thus, a feasible mechanism by which midazolam inhibits proliferation may be via the mediation of cyclin-dependent kinase inhibitor/retinoblastoma protein (CDKI/RB) pathways through the downregulation of USP22 [38].

Midazolam has been shown to inhibit the in vitro growth and differentiation of two murine myeloid leukemia cell lines (WEHI 3B (JCS) and M1 cells) in a dose-dependent manner [28]. Midazolam enhanced the expression of the differentiation antigens Mac-1, F4/80, and Gr-1 in the cells and expression of tumor necrosis factor (TNF-alpha), and the neutrophil-specific J11d differentiation marker was significantly upregulated in midazolam-treated JCS cells.

4.7. Antitumor Effects of Midazolam in Animal Models and Possible Mechanisms

There has only been one animal model study. This was carried out in BALB/c-nu mice bearing K562 and HT29 cell human tumor xenografts. The results showed that midazolam inhibited growth of the cancer cells via activation of the mitochondrial intrinsic pathway of apoptosis and inhibited HT29 tumor growth in the xenograft mice. The mechanism of inhibition of carcinogenesis by midazolam may be a suppression of reactive oxygen species (ROS) production leading to modulation of apoptosis and growth regulatory proteins [35].

5. Concluding Remarks

It is interesting to consider the possibility that, besides its use as an anesthetic agent, midazolam may have the ability to prevent or inhibit tumor development. New insights are rapidly being gained into the role of the midazolam in cancer treatment. In this review, the protective role of midazolam in cancer and the potential mechanisms underlying this have been described. Studies suggest a critical role for midazolam in influencing many signaling pathways on which cancer cells death is induced including necrosis and apoptosis. Midazolam can also inhibit the proliferation of cancer by inhibiting cell cycle progression. However, the impact of midazolam on other behavior of tumor cells, such as invasion and metastasis, remains to be further studied.

In relating observations in vitro to molecular events in vivo, a main focus is the different concentrations of midazolam used. In vitro studies, the concentrations of midazolam were usually from 0 to 100 μM, even achieving 200 μM or 1000 μM. The effect of different concentrations of midazolam on tumor cells was shown in Table 1. However, only one study has sought to evaluate, in vivo, the effect of midazolam on cancer preventive activities and the concentration of midazolam was 0.83 mg/kg body weight for BALB/c-nu mice bearing K562 and HT29 cells human tumor xenografts [35]. Further in vivo studies are needed to evaluate the effect of midazolam on cancer preventive activities and even address the relationship between the effective concentrations of midazolam in vivo versus in vitro.

The above discussions on the anticancer activities of midazolam are based mostly on studies with lymphoma cells and Leydig tumor cells. These theories will serve as a basis for researchers to explore the effect of midazolam on other tumors. For example, we are investigating the effect of midazolam on lung cancer cells (A549), and we found that midazolam could induce the apoptosis of A549 cells through regulating signal transducer and activator of transcription 3 (Stat3) signaling pathway. Although the detailed mechanism by which midazolam acts on cancer cells remains elusive, the results described above suggest that midazolam could present a potential therapeutic in various cancers. Further study into the role of midazolam in the prevention of cancer is crucial if translation from the laboratory to the clinical setting can occur.

Conflicts of Interest

The authors declare no conflicts of interest.

Acknowledgments

Many thanks to Dr. Sharon Forsyth in Biomedical Editing International in Australia for his assistance in this work. This work was supported by Science and Technology Fund Project of Shenyang Medical College (no. 20142034).

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Copyright © 2017 Jinghua Jiao 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.

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