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Is interleukin-1alpha a luteotrophic or luteolytic agent in cattle?
Magdalena Majewska1, Izabela Woclawek-Potocka, Mamadou M Bah
1Department of Reproductive Immunology and Pathology, Institute of Animal Reproduction and Food Research, Polish Academy of Sciences, 10-747 Olsztyn, Poland.
Reproduction (Cambridge, England)
|December 25, 2009
Summary
Interleukin-1alpha (IL1A) influences prostaglandin secretion in cows. In vivo, IL1A supports corpus luteum function by increasing progesterone and PGE2, prolonging lifespan, and inhibiting luteolysis.
Area of Science:
- Reproductive Biology
- Endocrinology
- Immunology
Background:
- Cytokines are implicated in regulating prostaglandin (PG) secretion in the bovine endometrium.
- The precise role of interleukin-1alpha (IL1A) in PG secretion remains unclear.
- Interferon-tau (IFNT) is a key pregnancy recognition hormone in cattle.
Purpose of the Study:
- To investigate the effects of IL1A on basal and IFNT-regulated PG secretion in vitro.
- To determine the in vivo impact of IL1A on PG secretion, progesterone (P4) output, and corpus luteum (CL) lifespan.
- To elucidate the dual role of IL1A in luteotrophic and luteolytic processes.
Main Methods:
- Bovine endometrial explants were treated with IL1A, IFNT, or both in vitro.
- In vivo experiments involved intra-uterine administration of IL1A on day 16 of the estrous cycle.
- Measurements included PG secretion (PGE2, PGF2α), P4 levels, and CL lifespan.
Main Results:
- IL1A stimulated PGE2 secretion in vitro in both pregnant and non-pregnant cows.
- IL1A induced luteolytic PGF2α secretion in the late luteal phase in vitro.
- In vivo, IL1A at specific doses stimulated P4 and PGE2, prolonged CL lifespan, and inhibited luteolysis.
Conclusions:
- IL1A exhibits a dual role, potentially stimulating luteolytic PGF2α in vitro but acting as a luteotrophic factor in vivo.
- IL1A enhances luteotrophic PGE2 and P4 output, thereby inhibiting spontaneous luteolysis.
- These findings suggest IL1A contributes to luteal development and function during the estrous cycle and early pregnancy in cows.
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