Abstract
In the present study, the toxicity of arsenic trioxide and lead acetate was assessed in adult hepatic stem cells induced in the 2-acetyl-aminofluorene/partial hepatectomy rat model. Isolated oval cells were incubated separately for 6 h with 40 μM each of arsenic trioxide and lead acetate. 3-(4,5-Dimethylthiazole-2-yl)-2,5-diphenyltetrazolium bromide assay denoted significant time-dependent cell death in arsenic and lead treated oval cells. The degree of stress imposed by these metals was evidenced by induction of heat shock protein (HSP) 70 and HSP 90. Arsenic and lead were found to trigger apoptosis as revealed by DNA ladder formation, Western blots of apoptotic factors, and reverse transcriptase polymerase chain reaction analyses of bax and bcl-2. Results clearly indicate that both arsenic and lead induced apoptosis is caspase-mediated and accompanied by extracellular signal-regulated kinase (ERK) dephosphorylation. Full-length BH3-interacting-domain death agonist expression in presence of caspase 3 inhibitor unravels a direct involvement of caspase in As and Pb induced apoptosis. Expression patterns of apoptosis inducing factor, B cell lymphoma-2 (Bcl-2) antagonist of cell death, Bcl-2-associated X protein, and Bcl2 also signify mitochondrial regulation of apoptosis effected by lead and arsenic. It is concluded that stimulation of caspase cascade and simultaneous ERK dephosphorylation are the most significant operative pathways directly associated with apoptotic signals triggered by arsenic and lead in the oval cells.
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Abbreviations
- AAF:
-
2-acetylaminofluorene
- AIF:
-
Apoptosis-inducing factor
- AP-1:
-
Activator protein-1
- Apaf-1:
-
Apoptotic protease activating factor-1
- Bcl-2:
-
B cell lymphoma-2
- Bax:
-
Bcl-2-associated X protein
- Bad:
-
Bcl-2 antagonist of cell death
- Bid:
-
BH3-interacting-domain death agonist
- CK-19:
-
cytokeratin 19
- DMA:
-
Dimethylarsinic acid
- DMEM:
-
Dulbecco’s minimum essential medium
- ERK:
-
Extracellular signal-regulated kinase
- GAPDH:
-
Glyceraldehyde phosphate dehydrogenase
- HBSS:
-
Hanks balanced salt solution
- HSP:
-
Heat shock protein
- MMA:
-
Monomethylarsonic acid
- MTT:
-
3-(4,5-dimethylthiazole-2-yl)-2,5-diphenyltetrazolium bromide
- NFkB:
-
Nuclear factor kB
- OV1:
-
Oval cell marker 1
- OV6:
-
Oval cell marker 6
- PH:
-
Partial hepatectomy
- RT PCR:
-
Reverse transcriptase polymerase chain reaction
- SCF:
-
Stem cell factor
- ZFL:
-
Zebra fish liver cell line
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Acknowledgements
SB, SM, and SR gratefully acknowledge the Council of Scientific and Industrial Research for project grant (Project No. 37(1179)/04/EMR-II) and the CAS (UGC) grants to the department which enabled the present study. AR and SA are thankful for the UGC Research Fellowships. Authors are expressing their sincere gratitude to Professor Kaoru Kubokawa, Ocean Research Institute, University of Tokyo, Japan for providing Actinase-E for the present study. Authors also express their sincere gratitude to Mr Hemanta Yadav for his technical assistance.
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Agarwal, S., Roy, S., Ray, A. et al. Arsenic trioxide and lead acetate induce apoptosis in adult rat hepatic stem cells. Cell Biol Toxicol 25, 403–413 (2009). https://doi.org/10.1007/s10565-008-9094-6
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DOI: https://doi.org/10.1007/s10565-008-9094-6