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Abstract
Many potentially toxic electrophilic xenobiotics and some endogenous compounds are detoxified by conversion to the corresponding glutathione S-conjugate, which is metabolized to the N-acetylcysteine S-conjugate (mercapturate) and excreted. Some mercapturate pathway components, however, are toxic. Bioactivation (toxification) may occur when the glutathione S-conjugate (or mercapturate) is converted to a cysteine S-conjugate that undergoes a β-lyase reaction. If the sulfhydryl-containing fragment produced in this reaction is reactive, toxicity may ensue. Some drugs and halogenated workplace/environmental contaminants are bioactivated by this mechanism. On the other hand, cysteine S-conjugate β-lyases occur in nature as a means of generating some biologically useful sulfhydryl-containing compounds.
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Iwakura T, Fujigaki Y, Fujikura T, Tsuji T, Ohashi N, Kato A, Yasuda H. Cytoresistance after acute kidney injury is limited to the recovery period of proximal tubule integrity and possibly involves Hippo-YAP signaling. Physiol Rep 2017; 5:5/11/e13310. [PMID: 28611154 PMCID: PMC5471447 DOI: 10.14814/phy2.13310] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/25/2017] [Revised: 04/29/2017] [Accepted: 05/10/2017] [Indexed: 12/22/2022] Open
Abstract
Rat proximal tubule (PT) cells that have recovered from severe acute kidney injury induced by uranyl acetate (UA) develop cytoresistance to subsequent UA treatments. We reported that enhanced G1 arrest might contribute to cytoresistance. Herein, we examined these mechanisms by investigating Yes-associated protein (YAP), a regulator of cell number, and survivin, a downstream mediator of YAP that inhibits apoptosis. Rats pretreated with saline (vehicle group) or UA (AKI group) were injected with UA 2 weeks, 2 months, or 6 months after treatment. Cytoresistance, evaluated by serum creatinine, was observed at 2 weeks, was attenuated at 2 months, and was lost at 6 months in the AKI group. Based on immunohistochemistry, overexpressed YAP/survivin in PT cells and an increased number of PT cells was found before the second insult at 2 weeks, regressed gradually, and returned to a normal value by 6 months in the AKI group. Cell cycle status, assessed by flow cytometry, was equivalent in all groups before the second insult. However, early G1 phase (cyclin D1-) and p27+ PT cells increased in the AKI group compared to those in the vehicle group until 2 months, but were comparable to those in the vehicle group at 6 months. p21+ PT cells increased at 2 weeks, but normalized by 2 months. Thus, PT cells that have recovered from AKI transiently overexpress YAP/survivin, probably inhibiting apoptosis and resulting in acquired cytoresistance. This effect occurs until PT remodeling is complete, subceullular PT integrity is restored, and cell numbers are normalized.
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Affiliation(s)
- Takamasa Iwakura
- Internal Medicine I, Division of Nephrology, Hamamatsu University School of Medicine, Hamamatsu, Japan
| | - Yoshihide Fujigaki
- Department of Medicine, Teikyo University School of Medicine, Tokyo, Japan
| | - Tomoyuki Fujikura
- Internal Medicine I, Division of Nephrology, Hamamatsu University School of Medicine, Hamamatsu, Japan
| | - Takayuki Tsuji
- Internal Medicine I, Division of Nephrology, Hamamatsu University School of Medicine, Hamamatsu, Japan
| | - Naro Ohashi
- Internal Medicine I, Division of Nephrology, Hamamatsu University School of Medicine, Hamamatsu, Japan
| | - Akihiko Kato
- Blood Purification Unit, Hamamatsu University School of Medicine, Hamamatsu, Japan
| | - Hideo Yasuda
- Internal Medicine I, Division of Nephrology, Hamamatsu University School of Medicine, Hamamatsu, Japan
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Iwakura T, Fujigaki Y, Fujikura T, Ohashi N, Kato A, Yasuda H. Acquired resistance to rechallenge injury after acute kidney injury in rats is associated with cell cycle arrest in proximal tubule cells. Am J Physiol Renal Physiol 2016; 310:F872-84. [PMID: 26823281 DOI: 10.1152/ajprenal.00380.2015] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/20/2015] [Accepted: 01/27/2016] [Indexed: 01/26/2023] Open
Abstract
Rats that have recovered from severe proximal tubule (PT) injury induced by uranyl acetate (UA), a toxic stimulus, developed resistance to subsequent UA treatment. We investigated cell cycle status and progression in PT cells in relation to this acquired resistance. Fourteen days after pretreatment with saline (vehicle group) or UA [acute kidney injury (AKI) group], rats were injected with UA or lead acetate (a proliferative stimulus). Cell cycle status (G0/G1/S/G2/M) was analyzed by flow cytometry. The expression of cell cycle markers, cyclin-dependent kinase inhibitors, and phenotypic markers were examined by immunohistochemistry. Cell cycle status in PT cells in the AKI group was comparable to those of the vehicle group. However, more early G1-phase cells (cyclin D1- or Ki67-) and p21+ or p27+ cells were found in the PT of the AKI group than in that of the vehicle group. UA induced G1 arrest and inhibited S phase progression with earlier dedifferentiation and less apoptosis in PT cells of the AKI group. Lead acetate induced proliferation without dedifferentiation but with delayed G0-G1 transition and inhibited S phase progression in PT cells in the AKI group. Sustained p21 and increased p27 expression in PT cells were found in the AKI group in response to UA and lead acetate. PT cells in the AKI group inhibited cell cycle progression by enhanced G1 arrest, probably via p21/p27 modulation as an injury or proliferation response, resulting in cytoresistance to rechallenge injury.
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Affiliation(s)
- Takamasa Iwakura
- Internal Medicine I, Division of Nephrology, Hamamatsu University School of Medicine, Hamamatsu, Japan
| | - Yoshihide Fujigaki
- Internal Medicine I, Division of Nephrology, Hamamatsu University School of Medicine, Hamamatsu, Japan; Department of Medicine, Teikyo University School of Medicine, Tokyo, Japan; and
| | - Tomoyuki Fujikura
- Internal Medicine I, Division of Nephrology, Hamamatsu University School of Medicine, Hamamatsu, Japan
| | - Naro Ohashi
- Internal Medicine I, Division of Nephrology, Hamamatsu University School of Medicine, Hamamatsu, Japan
| | - Akihiko Kato
- Blood Purification Unit, Hamamatsu University School of Medicine, Hamamatsu, Japan
| | - Hideo Yasuda
- Internal Medicine I, Division of Nephrology, Hamamatsu University School of Medicine, Hamamatsu, Japan
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Shirai N, Ohtsuji M, Hagiwara K, Tomisawa H, Ohtsuji N, Hirose S, Hagiwara H. Nephrotoxic effect of subchronic exposure to S-(1,2-dichlorovinyl)-L-cysteine in mice. J Toxicol Sci 2013; 37:871-8. [PMID: 23037997 DOI: 10.2131/jts.37.871] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/02/2022]
Abstract
The effect of subchronic exposure of S-(1,2-dichlorovinyl)-L-cysteine (DCVC), an active metabolite of trichloroethylene (TCE), was investigated in mice, as a part of mechanistic assessment of renal toxicity of TCE. To examine the subchronic effects of DCVC on kidney function, Balb/c male mice were administered DCVC orally and intraperitoneally once a week for 13 weeks at 1, 10 and 30 mg/kg (Main Study) and for 8 weeks at 30 mg/kg (PCR Study). At the terminal sacrifice, mice orally and intraperitoneally administered with 10 and 30 mg/kg showed significantly lower kidney weight and significantly higher blood urea nitrogen levels than the control group. Pathological examination revealed that a dose of 30 mg/kg delivered by both routes resulted in renal tubular degeneration characterized by tubular necrosis and interstitial fibrosis, and in degradation of the cortex. Degenerative changes were accompanied by the increased expression of tumor necrosis factor-α, interleukin-6 and cyclooxygenase-2 mRNAs in the kidney of mice treated with 30 mg/kg for 8 weeks. These pathohistological observations mostly corresponded to those in short-term toxicity studies on DCVC. DCVC might be a direct cause of renal toxicity, which is suggested from the aggravation in these symptoms with the dose increase.
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Affiliation(s)
- Nobuaki Shirai
- Department of Biomedical Engineering, Toin University of Yokohama, Yokohama, Japan
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Acquired resistance to rechallenge injury in rats that recovered from mild renal damage induced by uranyl acetate: accelerated proliferation and hepatocyte growth factor/c-Met axis. Clin Exp Nephrol 2011; 15:666-675. [DOI: 10.1007/s10157-011-0453-x] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/21/2011] [Accepted: 04/07/2011] [Indexed: 11/27/2022]
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Preconditioning induced by gentamicin protects against acute kidney injury: The role of prostaglandins but not nitric oxide. Toxicol Appl Pharmacol 2011; 253:1-6. [DOI: 10.1016/j.taap.2011.02.022] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/10/2010] [Revised: 02/23/2011] [Accepted: 02/28/2011] [Indexed: 11/21/2022]
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Abstract
Many potentially toxic electrophiles react with glutathione to form glutathione S-conjugates in reactions catalyzed or enhanced by glutathione S-transferases. The glutathione S-conjugate is sequentially converted to the cysteinylglycine-, cysteine- and N-acetyl-cysteine S-conjugate (mercapturate). The mercapturate is generally more polar and water soluble than the parent electrophile and is readily excreted. Excretion of the mercapturate represents a detoxication mechanism. Some endogenous compounds, such as leukotrienes, prostaglandin (PG) A2, 15-deoxy-Δ12,14-PGJ2, and hydroxynonenal can also be metabolized to mercapturates and excreted. On occasion, however, formation of glutathione S- and cysteine S-conjugates are bioactivation events as the metabolites are mutagenic and/or cytotoxic. When the cysteine S-conjugate contains a strong electron-withdrawing group attached at the sulfur, it may be converted by cysteine S-conjugate β-lyases to pyruvate, ammonium and the original electrophile modified to contain an –SH group. If this modified electrophile is highly reactive then the enzymes of the mercapturate pathway together with the cysteine S-conjugate β-lyases constitute a bioactivation pathway. Some endogenous halogenated environmental contaminants and drugs are bioactivated by this mechanism. Recent studies suggest that coupling of enzymes of the mercapturate pathway to cysteine S-conjugate β-lyases may be more common in nature and more widespread in the metabolism of electrophilic xenobiotics than previously realized.
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Acquired resistance to rechallenge injury in rats recovered from subclinical renal damage with uranyl acetate--Importance of proliferative activity of tubular cells. Toxicol Appl Pharmacol 2009; 243:104-10. [PMID: 19931553 DOI: 10.1016/j.taap.2009.11.018] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/01/2009] [Revised: 10/25/2009] [Accepted: 11/10/2009] [Indexed: 02/07/2023]
Abstract
Animals recovered from acute renal failure are resistant to subsequent insult. We investigated whether rats recovered from mild proximal tubule (PT) injury without renal dysfunction (subclinical renal damage) acquire the same resistance. Rats 14 days after recovering from subclinical renal damage, which was induced by 0.2 mg/kg of uranyl acetate (UA) (sub-toxic dose), were rechallenged with 4 mg/kg of UA (nephrotoxic dose). Fate of PT cells and renal function were examined in response to nephrotoxic dose of UA. All divided cells after sub-toxic dose of UA insult were labeled with bromodeoxyuridine (BrdU) for 14 days then the number of PT cells with or without BrdU-labeling was counted following nephrotoxic dose of UA insult. Rats recovered from subclinical renal damage gained resistance to nephrotoxic dose of UA with reduced renal dysfunction, less severity of peak damage (necrotic and TUNEL+ apoptotic cells) and accelerated PT cell proliferation, but with earlier peak of PT damage. The decrease in number of PT cells in the early phase of rechallenge injury with nephrotoxic UA was more in rats pretreated with sub-toxic dose of UA than vehicle pretreated rats. The exaggerated loss of PT cells was mainly caused by the exaggerated loss of BrdU+ divided cells. In contrast, accelerated cell proliferation in rats recovered from sub-toxic dose of UA was observed mainly in BrdU- non-divided cells. The findings suggest that rats recovered from subclinical renal damage showed partial acquired resistance to nephrotoxic insult. Accelerated recovery with increased proliferative activity of non-divided PT cells after subclinical renal damage may mainly contribute to acquired resistance.
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The rat red blood cell proteome is altered by priming with 2-butoxyethanol. Toxicol Appl Pharmacol 2008; 230:338-45. [DOI: 10.1016/j.taap.2008.03.005] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/07/2007] [Revised: 02/29/2008] [Accepted: 03/08/2008] [Indexed: 11/20/2022]
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Korrapati MC, Chilakapati J, Witzmann FA, Rao C, Lock EA, Mehendale HM. Proteomics of S-(1, 2-dichlorovinyl)-L-cysteine-induced acute renal failure and autoprotection in mice. Am J Physiol Renal Physiol 2007; 293:F994-F1006. [PMID: 17581926 DOI: 10.1152/ajprenal.00114.2007] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
Previous studies (Vaidya VS, Shankar K, Lock EA, Bucci TJ, Mehendale HM. Toxicol Sci 74: 215-227, 2003; Korrapati MC, Lock EA, Mehendale HM. Am J Physiol Renal Physiol 289: F175-F185, 2005; Korrapati MC, Chilakapati J, Lock EA, Latendresse JR, Warbritton A, Mehendale HM. Am J Physiol Renal Physiol 291: F439-F455, 2006) demonstrated that renal repair stimulated by a low dose of S-(1,2-dichlorovinyl)l-cysteine (DCVC; 15 mg/kg i.p.) 72 h before administration of a normally lethal dose (75 mg/kg i.p.) protects mice from acute renal failure (ARF) and death (autoprotection). The present study identified the proteins indicative of DCVC-induced ARF and autoprotection in male Swiss Webster mice. Renal dysfunction and injury were assessed by plasma creatinine and histopathology, respectively. Whole-kidney homogenates were run on two-dimensional gel electrophoresis gels, and the expression of 18 common proteins was maximally changed (> or =10-fold) in all the treatment groups and they were conclusively identified by liquid chromatography tandem mass spectrometry. These proteins were mildly downregulated after low dose alone and in autoprotected mice in contrast to severe downregulation with high dose alone. Glucose-regulated protein 75 and proteasome alpha-subunit type 1 were further investigated by immunohistochemistry for their localization in the kidneys of all the groups. These proteins were substantially higher in the proximal convoluted tubular epithelial cells in the low-dose and autoprotected groups compared with high-dose alone group. Proteins involved in energetics were downregulated in all the three groups of mice, leading to a compromise in cellular energy. However, energy is recovered completely in low-dose and autoprotected mice. This study provides the first report on proteomics of DCVC-induced ARF and autoprotection in mice and reflects the application of proteomics in mechanistic studies as well as biomarker development in a variety of toxicological paradigms.
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Affiliation(s)
- Midhun C Korrapati
- Department of Toxicology, College of Pharmacy, University of Louisiana Monroe, Monroe, Louisiana 71209-0470, USA
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Lash LH, Putt DA, Hueni SE, Payton SG, Zwickl J. Interactive toxicity of inorganic mercury and trichloroethylene in rat and human proximal tubules: effects on apoptosis, necrosis, and glutathione status. Toxicol Appl Pharmacol 2007; 221:349-62. [PMID: 17481684 PMCID: PMC2014866 DOI: 10.1016/j.taap.2007.03.023] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/07/2007] [Revised: 03/19/2007] [Accepted: 03/22/2007] [Indexed: 11/30/2022]
Abstract
Simultaneous or prior exposure to one chemical may alter the concurrent or subsequent response to another chemical, often in unexpected ways. This is particularly true when the two chemicals share common mechanisms of action. The present study uses the paradigm of prior exposure to study the interactive toxicity between inorganic mercury (Hg(2+)) and trichloroethylene (TRI) or its metabolite S-(1,2-dichlorovinyl)-l-cysteine (DCVC) in rat and human proximal tubule. Pretreatment of rats with a subtoxic dose of Hg(2+) increased expression of glutathione S-transferase-alpha1 (GSTalpha1) but decreased expression of GSTalpha2, increased activities of several GSH-dependent enzymes, and increased GSH conjugation of TRI. Primary cultures of rat proximal tubular (rPT) cells exhibited both necrosis and apoptosis after incubation with Hg(2+). Pretreatment of human proximal tubular (hPT) cells with Hg(2+) caused little or no changes in GST expression or activities of GSH-dependent enzymes, decreased apoptosis induced by TRI or DCVC, but increased necrosis induced by DCVC. In contrast, pretreatment of hPT cells with TRI or DCVC protected from Hg(2+) by decreasing necrosis and increasing apoptosis. Thus, whereas pretreatment of hPT cells with Hg(2+) exacerbated cellular injury due to TRI or DCVC by shifting the response from apoptosis to necrosis, pretreatment of hPT cells with either TRI or DCVC protected from Hg(2+)-induced cytotoxicity by shifting the response from necrosis to apoptosis. These results demonstrate that by altering processes related to GSH status, susceptibilities of rPT and hPT cells to acute injury from Hg(2+), TRI, or DCVC are markedly altered by prior exposures.
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Affiliation(s)
- Lawrence H Lash
- Department of Pharmacology, Wayne State University School of Medicine, 540 East Canfield Avenue, Detroit, MI 48201, USA.
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Voss AA, Díez-Sampedro A, Hirayama BA, Loo DDF, Wright EM. Imino sugars are potent agonists of the human glucose sensor SGLT3. Mol Pharmacol 2006; 71:628-34. [PMID: 17110502 DOI: 10.1124/mol.106.030288] [Citation(s) in RCA: 53] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
Imino sugars are used to treat type 2 diabetes mellitus [miglitol (Glyset)] and lysosomal storage disorders [miglustat (Zavesca)] based on the inhibition of alpha-glucosidases and glucosyltransferases. In this substrate specificity study, we examined the interactions of imino sugars with a novel human glucose sensor, sodium/glucose cotransporter type 3 (hSGLT3), using expression in Xenopus laevis oocytes and electrophysiology. The results for hSGLT3 are compared with those for alpha-glucosidases and human SGLT type 1 (hSGLT1), a well characterized sodium/glucose cotransporter of the SGLT family. In general, substrates have lower apparent affinities (K0.5) for hSGLT3 than hSGLT1 (D-glucose, alpha-methyl-D-glucose, 1-deoxy-D-glucose, and 4-deoxy-4-fluoro-D-glucose exhibit K0.5 values of 19, 21, 43, and 17 mM, respectively, for hSGLT3, and 0.5, 0.7, 10, and 0.07 mM, respectively, for hSGLT1). However, specificity of hSGLT3 binding is greater (D-galactose and 4-deoxy-4-fluoro-D-galactose are not hSGLT3 substrates, but have hSGLT1 K0.5 values of 0.6 and 1.3 mM). An important deviation from this trend is potent hSGLT3 activation by the imino sugars 1-deoxynojirimycin (DNJ), N-hydroxylethyl-1-deoxynojirimycin (miglitol), N-butyl-1-deoxynojirimycin (miglustat), N-ethyl-1-deoxynojirimycin, and 1-deoxynojirimycin-1-sulfonic acid, with K0.5 values of 0.5 to 9 microM. The diastereomer 1-deoxygalactonojirimycin activates hSGT3 with a K0.5 value of 11 mM, a 3000-fold less potent interaction than is observed for DNJ (4 microM). These imino sugar binding characteristics are similar to those for alpha-glucosidases, but there are no interactions with hSGLT1. This work provides insights into hSGLT3 and -1 substrate binding interactions, establishes a pharmacological profile to study endogenous hSGLT3, and may have important ramifications for the clinical application of imino sugars.
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Affiliation(s)
- Andrew A Voss
- David Geffen School of Medicine at UCLA, Department of Physiology, 10833 Le Conte Avenue, 53-263 Center for Health Sciences, Los Angeles, CA 90095-1751, USA.
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Devi SS, Philip BK, Warbritton A, Latendresse JR, Mehendale HM. Prior administration of a low dose of thioacetamide protects type 1 diabetic rats from subsequent administration of lethal dose of thioacetamide. Toxicology 2006; 226:107-17. [PMID: 16901604 DOI: 10.1016/j.tox.2006.06.007] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/13/2006] [Revised: 05/22/2006] [Accepted: 06/03/2006] [Indexed: 01/22/2023]
Abstract
Previously, we reported that an ordinarily non-lethal dose of thioacetamide (TA, 300 mg/kg) causes 90% mortality in type 1 diabetic rats due to inhibited liver tissue repair, whereas 30 mg TA/kg allows 100% survival due to stimulated although delayed tissue repair. Objective of this investigation was to test whether prior administration of a low dose of TA (30 mg/kg) would lead to sustainable stimulation of liver tissue repair in type 1 diabetic rats sufficient to protect from a subsequently administered lethal dose of TA. Therefore, in the present study, the hypothesis that preplacement of tissue repair by a low dose of TA (30 mg TA/kg, ip) can reverse the hepatotoxicant sensitivity (autoprotection) in type 1 diabetic rats was tested. Preliminary studies revealed that a single intraperitoneal (ip) administration of TA causes 90% mortality in diabetic rats with as low as 75 mg/kg. To establish an autoprotection model in diabetic condition, diabetic rats were treated with 30 mg TA/kg (priming dose). Administration of priming dose stimulated tissue repair that peaked at 72h, at which time these rats were treated with a single ip dose of 75 mg TA/kg. Our results show that tissue repair stimulated by the priming dose enabled diabetic rats to overexpress, calpastatin, endogenous inhibitor of calpain, to inhibit calpain-mediated progression of liver injury induced by the subsequent administration of lethal dose, resulting in 100% survival. Further investigation revealed that protection observed in these rats is not due to decreased bioactivation. These studies underscore the importance of stimulation of tissue repair in the final outcome of liver injury (survival/death) after hepatotoxicant challenge. Furthermore, these results also suggest that it is possible to stimulate tissue repair in diabetics to overcome the enhanced sensitivity of hepatotoxicants.
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Affiliation(s)
- Sachin S Devi
- Department of Toxicology, College of Pharmacy, The University of Louisiana at Monroe, 700 University Ave, Monroe, LA 71209, USA
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