Role of tumor necrosis factor-alpha and nitric oxide in luteolysis in cattle.

Abstract:

:Although prostaglandin (PG) F2alpha is known to be a principal luteolytic factor, its action on the bovine corpus luteum (CL) is mediated by other intra-ovarian factors. Tumor necrosis factor-alpha (TNFalpha) and its specific receptors are present in the bovine CL with the highest expressions at luteolysis. TNFalpha in combination with interferon-gamma reduced progesterone (P4) secretion, increased PGF2alpha and leukotriene C4 (LTC4) production, and induced apoptosis of the luteal cells in vitro. Low concentrations of TNFalpha caused luteolysis, which resulted in a decreased level of P4, and increased levels of PGF2alpha, LTC4 and nitrite/nitrate (stable metabolites of nitric oxide-NO) in the blood. Inhibition of local NO production counteracts spontaneous and PGF2alpha-induced luteolysis. Therefore, NO is a likely candidate for the molecule that mediates PGF2alpha and TNFalpha actions during luteolysis. Both PGF2alpha and TNFalpha increase NO concentrations in blood, and stimulate NO synthase expression on protein level in the bovine CL cells. NO stimulates PGF2alpha and LTC4 secretion, inhibits P4 production and reduces the number of viable luteal cells. TNFalpha and NO induce apoptotic death of the CL by modulating expression of bcl-2 family genes and by stimulating expression and activity of caspase-3. The above findings indicate that TNFalpha and NO play crucial roles in functional and structural luteolysis in cattle.

journal_name

Domest Anim Endocrinol

authors

Skarzynski DJ,Jaroszewski JJ,Okuda K

doi

10.1016/j.domaniend.2005.02.005

subject

Has Abstract

pub_date

2005-08-01 00:00:00

pages

340-6

issue

2

eissn

0739-7240

issn

1879-0054

pii

S0739-7240(05)00023-8

journal_volume

29

pub_type

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