Heat-induced hyperthermia impacts the follicular fluid proteome of the periovulatory follicle in lactating dairy cows.

Autor: Rispoli LA; Department of Animal Science, The University of Tennessee, Institute of Agriculture, AgResearch, Knoxville, TN, United States of America., Edwards JL; Department of Animal Science, The University of Tennessee, Institute of Agriculture, AgResearch, Knoxville, TN, United States of America., Pohler KG; Department of Animal Science, The University of Tennessee, Institute of Agriculture, AgResearch, Knoxville, TN, United States of America., Russell S; ITSI-Biosciences, LLC, Johnstown, PA, United States of America., Somiari RI; ITSI-Biosciences, LLC, Johnstown, PA, United States of America., Payton RR; Department of Animal Science, The University of Tennessee, Institute of Agriculture, AgResearch, Knoxville, TN, United States of America., Schrick FN; Department of Animal Science, The University of Tennessee, Institute of Agriculture, AgResearch, Knoxville, TN, United States of America.
Jazyk: angličtina
Zdroj: PloS one [PLoS One] 2019 Dec 30; Vol. 14 (12), pp. e0227095. Date of Electronic Publication: 2019 Dec 30 (Print Publication: 2019).
DOI: 10.1371/journal.pone.0227095
Abstrakt: We hypothesized that heat-induced perturbations in cumulus cells surrounding the maturing oocyte may extend to the mural granulosa of the periovulatory follicle in the heat-stressed cow to subsequently the follicular fluid proteome. Lactating Holsteins were pharmacologically stimulated to have a dominant follicle that was capable of responding to a gonadotropin releasing hormone-induced luteinizing hormone surge. Following gonadotropin releasing hormone administration, cows were maintained at ~67 temperature humidity index (THI; thermoneutral conditions) or exposed to conditions simulating an acute heat stress event (71 to 86 THI; heat stress for ~12 h). Dominant follicle collection was conducted in the periovulatory period ~16 h after gonadotropin releasing hormone. Follicular fluid proteome from thermoneutral (n = 5) and hyperthermic (n = 5) cows was evaluated by quantitative tandem mass spectrometry (nano LC-MS/MS). We identified 35 differentially-abundant proteins. Functional annotation revealed numerous immune-related proteins. Subsequent efforts revealed an increase in levels of the proinflammatory mediator bradykinin in follicular fluid (P = 0.0456) but not in serum (P = 0.9319) of hyperthermic cows. Intrafollicular increases in transferrin (negative acute phase protein) in hyperthermic cows (P = 0.0181) coincided with a tendency for levels to be increased in the circulation (P = 0.0683). Nine out of 15 cytokines evaluated were detected in follicular fluid. Heat stress increased intrafollicular interleukin 6 levels (P = 0.0160). Whether hyperthermia-induced changes in the heat-stressed cow's follicular fluid milieu reflect changes in mural granulosa, cumulus, other cell types secretions, and/or transudative changes from circulation remains unclear. Regardless of origin, heat stress/hyperthermia related changes in the follicular fluid milieu may have an impact on components important for ovulation and competence of the cumulus-oocyte complex contained within the periovulatory follicle.
Competing Interests: Authors JLE/LAR/KGP/RRP/FNS have no competing interests. Authors SR/RIS are affiliated/employed by ITSI Biosciences. Their commercial affiliation does not alter our adherence to PLOS ONE policies on sharing data and materials.
Databáze: MEDLINE
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