Effect of oophorectomy and exogenous estrogen replacement on liver injury in experimental obstructive jaundice

To investigate the role of estrogen on liver injury in an experimental obstructive jaundice model. Three groups of female rats were constituted; group 1 was oophorectomized and given E2 (n = 14), group 2 was oophorectomized and given placebo (n = 14), and group 3 was sham operated (n = 14). Fourteen...

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Published in:World journal of gastroenterology : WJG 2008-05, Vol.14 (18), p.2818-2824
Main Authors: Ucan, Hamdi Bulent, Kaplan, Mehmet, Salman, Bulent, Yilmaz, Utku, Mentes, B-Bulent, Aybay, Cemalettin
Format: Article
Language:English
Subjects:
Animals
Clinical Research
Estrogen Replacement Therapy
Estrogens - pharmacology
Female
Interferon-gamma - metabolism
Interleukin-6 - metabolism
Jaundice, Obstructive - metabolism
Jaundice, Obstructive - pathology
Jaundice, Obstructive - therapy
Kupffer Cells - drug effects
Kupffer Cells - metabolism
Kupffer Cells - pathology
Liver - drug effects
Liver - metabolism
Liver - pathology
Ovariectomy
Random Allocation
Rats
Rats, Wistar
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Summary:To investigate the role of estrogen on liver injury in an experimental obstructive jaundice model. Three groups of female rats were constituted; group 1 was oophorectomized and given E2 (n = 14), group 2 was oophorectomized and given placebo (n = 14), and group 3 was sham operated (n = 14). Fourteen days following constitution of bile duct ligation, all groups were compared in terms of serum tests, histopathologic parameters, and tissue levels of IFN-gamma and IL-6. The parameters representing both the injury and/or the reactive response and healing were more pronounced in groups 1 and 2 (c2 = 17.2, c2 = 10.20; c2 = 12.4, P < 0.05). In the sham operated or E2 administered groups significantly lower tissue levels of IFN-gamma and higher IL-6 levels were found. In contrast, high IFN-gamma and low IL-6 tissue levels were found in the oophorectomized and placebo group (P < 0.001). Kupffer cell alterations were observed to be more pronounced in the groups 1 and 3 (c2 = 6.13, P < 0.05). Our study indicates that E2 impaired liver functions, accelerated both the liver damage and healing. In the conditions of bile duct obstruction, estrogen significantly changed the cytokine milieu in the liver.
ISSN:1007-9327
DOI:10.3748/wjg.14.2818