Evaluation of the toxicity of a substituted 2,4-thiazolidinedione moiety to isolated rat hepatocytes: relevance to glitazone toxicity

A.J. Meechan, C.J. Henderson, Geoff Coxon, J.N.A. Tettey, M.H. Grant

Research output: Contribution to journalConference Contribution

Abstract

Troglitazone (TGZ), a 2,4 thiazolidinedione (TZD) anti-diabetic agent, has been associated with hepatotoxicity in type II diabetic patients. The mechanism of toxicity has not yet been established. However, it has been reported (Kennedy et al., 2003) that the incorporation of a sulphur atom in the cyclic imide structure of N-(3,5-dichlorophenyl)succinimide (NDPS), analogous to the 2,4-TZD moiety in TGZ, resulted in hepatotoxicity. In this study we have examined the relative in vitro hepatotoxicity of 3-(3,5-dichlorophenyl)-2,4,thiazolidinedione (DCPT), which contains the 2,4-TZD moiety, and that of its structural analogue NDPS.
NDPS and DCPT were synthesised using a modification of the method of Fujinami et al (1971) and characterised by NMR and mass spectrometry. Hepatocytes were prepared from male Sprague-Dawley rats (180-220g), and cell viability was measured using Trypan Blue exclusion. Preparations with initial cell viability above 80% were used in all experiments. Cells were incubated for 3 hours with NDPS and DCPT at (0μM, 100μM, 500μM and 1mM in dimethylsulphoxide (0.1% (v/v)) at 37oC in an atmosphere of 95%O2/5%CO2). Samples were taken at regular time intervals (0, 15, 30, 60 90, 120, 180 minutes) for the measurement of viability, reduced glutathione (GSH) content and lactate dehydrogenase (LDH) activity in the extracellular medium.
Statistical analyses (ANOVA followed by Dunnett’s test) of the data (Table 1) obtained for hepatocytes exposed to DCPT and NDPS did not reveal significant differences in GSH content, LDH activity or cell viability over a 3h incubation period. These data indicate that the incorporation of a sulphur atom in the succinamide ring of NDPS to produce the corresponding 2,4 TZD (DCPT) does not result in an increase in hepatotoxic effects in vitro. This finding, together with our previous report on the lack of toxicity of the 2,4-TZD containing, rosiglitazone (Ball et al 2004 ), would suggest that a chemical mechanism of toxicity of TGZ (if feasible) might be a function of the whole molecule rather than the TZD moiety alone.

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Thiazolidinediones
troglitazone
Hepatocytes
Cell Survival
N-(3,5-dichlorophenyl)succinimide
rosiglitazone
L-Lactate Dehydrogenase
Sulfur
Imides
Trypan Blue
Dimethyl Sulfoxide
Atmosphere
Glutathione
Sprague Dawley Rats
2,4-thiazolidinedione
Mass Spectrometry
Analysis of Variance
3-(3,5-dichlorophenyl)-2,4-thiazolidinedione
N,N-di-n-propylserotonin

Keywords

  • evaluation
  • toxicity
  • substituted
  • 2,4-thiazolidinedione moiety
  • isolated rat hepatocytes
  • glitazone toxicity

Cite this

@article{8b1f5a2af72744ac8fea5c359789e534,
title = "Evaluation of the toxicity of a substituted 2,4-thiazolidinedione moiety to isolated rat hepatocytes: relevance to glitazone toxicity",
abstract = "Troglitazone (TGZ), a 2,4 thiazolidinedione (TZD) anti-diabetic agent, has been associated with hepatotoxicity in type II diabetic patients. The mechanism of toxicity has not yet been established. However, it has been reported (Kennedy et al., 2003) that the incorporation of a sulphur atom in the cyclic imide structure of N-(3,5-dichlorophenyl)succinimide (NDPS), analogous to the 2,4-TZD moiety in TGZ, resulted in hepatotoxicity. In this study we have examined the relative in vitro hepatotoxicity of 3-(3,5-dichlorophenyl)-2,4,thiazolidinedione (DCPT), which contains the 2,4-TZD moiety, and that of its structural analogue NDPS. NDPS and DCPT were synthesised using a modification of the method of Fujinami et al (1971) and characterised by NMR and mass spectrometry. Hepatocytes were prepared from male Sprague-Dawley rats (180-220g), and cell viability was measured using Trypan Blue exclusion. Preparations with initial cell viability above 80{\%} were used in all experiments. Cells were incubated for 3 hours with NDPS and DCPT at (0μM, 100μM, 500μM and 1mM in dimethylsulphoxide (0.1{\%} (v/v)) at 37oC in an atmosphere of 95{\%}O2/5{\%}CO2). Samples were taken at regular time intervals (0, 15, 30, 60 90, 120, 180 minutes) for the measurement of viability, reduced glutathione (GSH) content and lactate dehydrogenase (LDH) activity in the extracellular medium. Statistical analyses (ANOVA followed by Dunnett’s test) of the data (Table 1) obtained for hepatocytes exposed to DCPT and NDPS did not reveal significant differences in GSH content, LDH activity or cell viability over a 3h incubation period. These data indicate that the incorporation of a sulphur atom in the succinamide ring of NDPS to produce the corresponding 2,4 TZD (DCPT) does not result in an increase in hepatotoxic effects in vitro. This finding, together with our previous report on the lack of toxicity of the 2,4-TZD containing, rosiglitazone (Ball et al 2004 ), would suggest that a chemical mechanism of toxicity of TGZ (if feasible) might be a function of the whole molecule rather than the TZD moiety alone.",
keywords = "evaluation, toxicity, substituted, 2,4-thiazolidinedione moiety , isolated rat hepatocytes, glitazone toxicity",
author = "A.J. Meechan and C.J. Henderson and Geoff Coxon and J.N.A. Tettey and M.H. Grant",
year = "2004",
language = "English",
volume = "2",
journal = "pA2 Online: E Journal of the British Pharmacological Society",
issn = "1741-1157",
number = "4",

}

Evaluation of the toxicity of a substituted 2,4-thiazolidinedione moiety to isolated rat hepatocytes : relevance to glitazone toxicity. / Meechan, A.J.; Henderson, C.J.; Coxon, Geoff ; Tettey, J.N.A.; Grant, M.H.

In: pA2 Online: E Journal of the British Pharmacological Society, Vol. 2, No. 4, 2004.

Research output: Contribution to journalConference Contribution

TY - JOUR

T1 - Evaluation of the toxicity of a substituted 2,4-thiazolidinedione moiety to isolated rat hepatocytes

T2 - pA2 Online: E Journal of the British Pharmacological Society

AU - Meechan, A.J.

AU - Henderson, C.J.

AU - Coxon, Geoff

AU - Tettey, J.N.A.

AU - Grant, M.H.

PY - 2004

Y1 - 2004

N2 - Troglitazone (TGZ), a 2,4 thiazolidinedione (TZD) anti-diabetic agent, has been associated with hepatotoxicity in type II diabetic patients. The mechanism of toxicity has not yet been established. However, it has been reported (Kennedy et al., 2003) that the incorporation of a sulphur atom in the cyclic imide structure of N-(3,5-dichlorophenyl)succinimide (NDPS), analogous to the 2,4-TZD moiety in TGZ, resulted in hepatotoxicity. In this study we have examined the relative in vitro hepatotoxicity of 3-(3,5-dichlorophenyl)-2,4,thiazolidinedione (DCPT), which contains the 2,4-TZD moiety, and that of its structural analogue NDPS. NDPS and DCPT were synthesised using a modification of the method of Fujinami et al (1971) and characterised by NMR and mass spectrometry. Hepatocytes were prepared from male Sprague-Dawley rats (180-220g), and cell viability was measured using Trypan Blue exclusion. Preparations with initial cell viability above 80% were used in all experiments. Cells were incubated for 3 hours with NDPS and DCPT at (0μM, 100μM, 500μM and 1mM in dimethylsulphoxide (0.1% (v/v)) at 37oC in an atmosphere of 95%O2/5%CO2). Samples were taken at regular time intervals (0, 15, 30, 60 90, 120, 180 minutes) for the measurement of viability, reduced glutathione (GSH) content and lactate dehydrogenase (LDH) activity in the extracellular medium. Statistical analyses (ANOVA followed by Dunnett’s test) of the data (Table 1) obtained for hepatocytes exposed to DCPT and NDPS did not reveal significant differences in GSH content, LDH activity or cell viability over a 3h incubation period. These data indicate that the incorporation of a sulphur atom in the succinamide ring of NDPS to produce the corresponding 2,4 TZD (DCPT) does not result in an increase in hepatotoxic effects in vitro. This finding, together with our previous report on the lack of toxicity of the 2,4-TZD containing, rosiglitazone (Ball et al 2004 ), would suggest that a chemical mechanism of toxicity of TGZ (if feasible) might be a function of the whole molecule rather than the TZD moiety alone.

AB - Troglitazone (TGZ), a 2,4 thiazolidinedione (TZD) anti-diabetic agent, has been associated with hepatotoxicity in type II diabetic patients. The mechanism of toxicity has not yet been established. However, it has been reported (Kennedy et al., 2003) that the incorporation of a sulphur atom in the cyclic imide structure of N-(3,5-dichlorophenyl)succinimide (NDPS), analogous to the 2,4-TZD moiety in TGZ, resulted in hepatotoxicity. In this study we have examined the relative in vitro hepatotoxicity of 3-(3,5-dichlorophenyl)-2,4,thiazolidinedione (DCPT), which contains the 2,4-TZD moiety, and that of its structural analogue NDPS. NDPS and DCPT were synthesised using a modification of the method of Fujinami et al (1971) and characterised by NMR and mass spectrometry. Hepatocytes were prepared from male Sprague-Dawley rats (180-220g), and cell viability was measured using Trypan Blue exclusion. Preparations with initial cell viability above 80% were used in all experiments. Cells were incubated for 3 hours with NDPS and DCPT at (0μM, 100μM, 500μM and 1mM in dimethylsulphoxide (0.1% (v/v)) at 37oC in an atmosphere of 95%O2/5%CO2). Samples were taken at regular time intervals (0, 15, 30, 60 90, 120, 180 minutes) for the measurement of viability, reduced glutathione (GSH) content and lactate dehydrogenase (LDH) activity in the extracellular medium. Statistical analyses (ANOVA followed by Dunnett’s test) of the data (Table 1) obtained for hepatocytes exposed to DCPT and NDPS did not reveal significant differences in GSH content, LDH activity or cell viability over a 3h incubation period. These data indicate that the incorporation of a sulphur atom in the succinamide ring of NDPS to produce the corresponding 2,4 TZD (DCPT) does not result in an increase in hepatotoxic effects in vitro. This finding, together with our previous report on the lack of toxicity of the 2,4-TZD containing, rosiglitazone (Ball et al 2004 ), would suggest that a chemical mechanism of toxicity of TGZ (if feasible) might be a function of the whole molecule rather than the TZD moiety alone.

KW - evaluation

KW - toxicity

KW - substituted

KW - 2,4-thiazolidinedione moiety

KW - isolated rat hepatocytes

KW - glitazone toxicity

UR - http://www.pa2online.org/Vol2Issue4abst138P.html

M3 - Conference Contribution

VL - 2

JO - pA2 Online: E Journal of the British Pharmacological Society

JF - pA2 Online: E Journal of the British Pharmacological Society

SN - 1741-1157

IS - 4

ER -