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Protection of chlordecone-potentiated carbon tetrachloride hepatotoxicity and lethality by partial hepatectomy

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Abstract

Chlordecone (CD) pretreatment is known to markedly potentiate CCl4 hepatotoxicity. Previous studies have shown that prior exposure to CD obtunds the increased hepatocellular regeneration and repair observed in non-treated rats challenged with a single, low dose of CCl4. These observations allowed us to hypothesize that suppression of hepatic regeneration and tissue repair by CD + CCl4 combination treatment might be involved in this interaction. To test this hypothesis, CCl4 hepatotoxicity was evaluated in actively regenerating livers using CD-treated (10 ppm in the diet for 15 days), surgically partially hepatectomized (PH) male Sprague-Dawley rats. Rats undergoing no surgical manipulation (CTRL) and sham operation (SH) were included as appropriate controls. Surgical manipulations were conducted on day 15 of the dietary protocol. Based on liver-to-body weight ratios (LW/BW), mitotic indices, hepatic cytochrome P-450 content, and hepatic glutathione (GSH and GSSG) levels, PH-induced hepatocellular regeneration was not affected by pretreatment with CD. Thus, the PH model was considered valid for assessing the effects of CD + CCl4 combination treatment. CCl4 (100 μl/kg; i.p.) was administered 1, 2, 4 or 7 days after the surgical manipulations. Hepatotoxicity was assessed 24 h later by measuring LW/BW and serum enzymes (SGPT, SGOT and ICD) in all four groups. Hepatic histopathological, histomorphometric and lethal effects were assessed in animals receiving CCl4 1 or 7 days after the surgical manipulations. CCl4-induced increases in LW/BW were observed in CD + PH rats receiving CCl4 4 or 7 days post-PH, but not in the 1 or 2 day post-PH groups in which the hepatocellular regeneration was maximal. CCl4-induced serum enzyme elevations were significantly less in the CD + PH rats as compared to CD + SH. This decrease in the serum enzyme elevations was most prominent in the 1 day post-PH group, where the hepatocellular mitotic activity was most pronounced. CCl4 lethality, assessed in the 1 day post-surgical manipulation group, was also decreased in the CD + PH rats in comparison to CD + SH rats. Such a protection was not observed in rats receiving CCl4 7 days post-PH. These data are consistent with and are supportive of the hypothesis that a suppression of otherwise normally stimulated hepatocellular regeneration following low-dose CCl4 administration is involved in the marked amplification of CCl4 toxicity by CD.

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Abbreviations

CD:

chlordecone

GSH:

reduced glutathione

GSSG:

oxidized glutathione

PH:

partial hepatectomy

SH:

shamhepatectomy

CTRL:

control, not surgically manipulated

N:

normal diet

LW/BW:

liver weight-to-body weight ratio

SGPT:

serum glutamic; pyruvic transaminase

SGOT:

serum glutamic oxaloacetic transaminase

ICD:

isocitrate dehydrogenase

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Authors and Affiliations

  1. Department of Pharmacology and Toxicology, University of Mississippi Medical Center, 39216, Jackson, MS, USA

    Andrea N. Bell, Robert A. Young & Harihara M. Mehendale

  2. Department of Pathology, University of Mississippi Medical Center, 39216, Jackson, MS, USA

    Virginia G. Lockard

Authors
  1. Andrea N. Bell
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  2. Robert A. Young
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  3. Virginia G. Lockard
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  4. Harihara M. Mehendale
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Additional information

These studies were made possible by a grant from the US Environmental Protection Agency R-811072

A. N. Bell is a Predoctoral Toxicology Trainee and Robert A. Young is a Postdoctoral Trainee supported by Toxicology Training grant from National Institute of Environmental Health Science ES-07045

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Bell, A.N., Young, R.A., Lockard, V.G. et al. Protection of chlordecone-potentiated carbon tetrachloride hepatotoxicity and lethality by partial hepatectomy. Arch Toxicol 61, 392–405 (1988). https://doi.org/10.1007/BF00334621

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  • DOI: https://doi.org/10.1007/BF00334621

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