Gene expression profiling reveals potential key pathways involved in pyrazinamide‐mediated hepatotoxicity in Wistar rats

Antimicrob Agents Chemother

Liu

Hassan

et al. 2016

Self Cite

g Pyrazinamide (PZA) is an essential antitubercular drug, but little is still known about its hepatotoxicity potential. This study examined the effects of PZA exposure on zebrafish (Danio rerio) larvae and the mechanisms underlying its hepatotoxicity. A transgenic line of zebrafish larvae that expressed enhanced green fluorescent protein (EGFP) in the liver was incubated with 1, 2.5, and 5 mM PZA from 72 h postfertilization (hpf). Different endpoints such as mortality, morphology changes in the size and shape of the liver, histological changes, transaminase analysis and apoptosis, markers of oxidative and genetic damage, as well as the expression of certain genes were selected to evaluate PZA-induced hepatotoxicity. Our results confirm the manner of PZA dose-dependent hepatotoxicity. PZA was found to induce marked injury in zebrafish larvae, such as liver atrophy, elevations of transaminase levels, oxidative stress, and hepatocyte apoptosis. To further understand the mechanism behind PZA-induced hepatotoxicity, changes in gene expression levels in zebrafish larvae exposed to PZA for 72 h postexposure (hpe) were determined. The results of this study demonstrated that PZA decreased the expression levels of liver fatty acid binding protein (L-FABP) and its target gene, peroxisome proliferator-activated receptor ␣ (PPAR-␣), and provoked more severe oxidative stress and hepatitis via the upregulation of inflammatory cytokines such as tumor necrosis factor alpha (TNF-␣) and transforming growth factor ␤ (TGF-␤). These findings suggest that L-FABP-mediated PPAR-␣ downregulation appears to be a hepatotoxic response resulting from zebrafish larva liver cell apoptosis, and L-FABP can be used as a biomarker for the early detection of PZA-induced liver damage in zebrafish larvae. P yrazinamide (PZA) is an important first-line drug in tuberculosis (TB) combination chemotherapy and is used during the initial 2 months of treatment for its remarkable sterilizing activity (1). Hepatotoxicity is the major adverse effect of PZA and usually occurs in the first 2 months of treatment (2). Previously reported studies showed a high incidence of hepatotoxicity with a high dosage of 40 to 70 mg/kg of body weight and a low rate of liver injury with a daily dose of Ͻ35 mg/kg (3). Although a reduction of the clinical dose considerably decreased the rate of PZA-induced hepatotoxic side effects, PZA is still considered to induce higher hepatotoxicity than other first-line antituberculosis drugs (4, 5). PZA hepatotoxicity cannot be ignored; however, little is known about the exact mechanism of PZA-induced hepatotoxicity.Previous research, by using microarray analyses and proteomics studies, found that metabolism, inflammation, and oxidative stress pathways were probably involved in PZA-induced hepatotoxicity (6, 7). A recent investigation showed that the metabolite 5-hydroxypyrazinoic acid (5-OH-PA) is responsible for PZAinduced hepatotoxicity (8). Despite an increasing number of researchers who are trying to reevaluate the hepatotoxic potentia...

mentioning

confidence: 99%

Liver Fatty Acid Binding Protein Deficiency Provokes Oxidative Stress, Inflammation, and Apoptosis-Mediated Hepatotoxicity Induced by Pyrazinamide in Zebrafish Larvae

Antimicrob Agents Chemother

Liu

Hassan

et al. 2016

Self Cite

“…GSTP2 is a member of the GST Pi class, which is responsible for phase II cellular detoxification and plays an important antioxidant role by eliminating ROS as well through conjugation reactions with glutathione (Dong et al , ). Many xenobiotics can modulate drug‐metabolizing enzymes, and slight imbalances in the metabolic enzymes can have important chemical consequences that lead to oxidative stress or glutathione depletion (Zhang et al , ). Therefore, the upregulation of CYP3A and GSTP2 in the zebrafish larvae observed in this study might be due to exposure to INH.…”

Section: Discussionmentioning

confidence: 99%

Oxidative stress‐mediated developmental toxicity induced by isoniazide in zebrafish embryos and larvae

Zou

J of Applied Toxicology

Han

et al. 2017

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Isoniazide (INH) is an important first-line drug that is used to treat tuberculosis. However, the effect of INH on fetal growth has not yet been elucidated, and the mechanism of INH-induced developmental toxicity is still unknown. In the present study, we employed zebrafish embryos and larvae to investigate the developmental toxicity of INH. The survival rates of the embryos and larvae as well as the hatching rates of embryos were significantly reduced. Morphological abnormalities, including spinal curvature, yolk retention, swimming bladder absence, tail bending and shorter body lengths were induced by INH. Histopathological analysis showed loose cell-to-cell contacts and large vacuoles in the larval hepatocytes. Thin intestinal walls, frayed gut villi and widespread cell lysis were observed in the intestines of the larvae in the higher concentration (8, 16 mm) exposure groups. In addition, exposure to high doses (≥ 6 mm) of INH significantly reduced the locomotor capacity of the zebrafish larvae. INH significantly increased the levels of reactive oxygen species and malondialdehyde and decreased the superoxide dismutase activity in zebrafish larvae, which suggested that oxidative stress was induced and that the antioxidant capacity was inhibited. Superoxide dismutase 1 and liver fatty acid-binding protein mRNA levels were significantly downregulated, while the GSTP2 and cytochrome P450 3A mRNA levels were significantly upregulated in the INH-exposed zebrafish larvae. The overall results indicated that INH caused a dose- and time-dependent increase in developmental toxicity and that oxidative stress played an important role in the developmental toxicity induced by INH in zebrafish larvae. Copyright © 2017 John Wiley & Sons, Ltd.

“…In our previous study, the analysis of the genome‐wide microarray indicated peroxisome proliferator‐activated receptors (PPARs) signaling that the pathway had significantly changed (Zhang et al , ). PPARs belonging to the family of ligand‐activated transcription factors that were involved in lipid metabolism, inflammation and liver response to injury (Zardi et al , ).…”

Section: Discussionmentioning

confidence: 99%

“…In our previous study (Zhang et al, 2013), the analysis of the genome-wide microarray indicated that the PPARα signaling pathway was significantly changed. Changes in PPARα expression were shown in Fig.…”

Section: Expression Of Pparα In Relationship To the Severity Of Livermentioning

confidence: 95%

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Pyrazinamide induced hepatic injury in rats through inhibiting the PPARα pathway

J of Applied Toxicology

Guo

Hassan

et al. 2016

Self Cite

Pyrazinamide (PZA) causes serious hepatotoxicity, but little is known about the exact mechanism by which PZA induced liver injury. The peroxisome proliferator-activated receptors alpha (PPARα) is highly expressed in the liver and modulates the intracellular lipidmetabolism. So far, the role of PPARα in the hepatotoxicity of PZA is unknown. In the present study, we described the hepatotoxic effects of PZA and the role of PPARα and its target genes in the downstream pathway including L-Fabp, Lpl, Cpt-1b, Acaa1, Apo-A1 and Me1 in this process. We found PZA induced the liver lipid metabolism disorder and PPARα expressionwas down-regulated which had a significant inverse correlation with liver injury degree. These changeswere ameliorated by fenofibrate, the co-treatment that acts as a PPARα agonist. In contrast, short-termstarvation significantly aggravated the severity of PZA-induced liver injury. In conclusion, this study demonstrated the critical role played by PPARα in PZA-induced hepatotoxicity and provided a better understanding of the molecular mechanisms underlying PZA-induced liver injury. Copyright © 2016 John Wiley & Sons, Ltd.