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SAM PMN Parturition

ABSTRACT: Bovine blood neutrophil RNA from 4 primiparous Holstein cows was collected on days -7, 0, 0.25, and 1 (relative to parturition on day 0). RNA was pooled across the four animals at the independent time points to obtain the 20 ug necessary for use in a loop design. RNA pools were separated into two 10 ug aliquots prior to cDNA synthesis and dye coupling in a loop design. Each sample was labeled with Cy3 and Cy5 and run in paired hybridizations as follows: GSM8506 compaired day 0.25 and day -7, GSM8507 compaired day 1 and day 0, GSM8508 compaired day -7 and day 1, GSM8509 compaired day 0 and 0.25. This pairing strategy was utilized to directly compare day -7 samples with days 0.25 and 1 samples because results from previous experiments suggested that the most pronounced differences in gene expression would occur between these days. Keywords = microarray, cDNA, bovine, neutrophil, parturition Keywords: time-course

ORGANISM(S): Bos taurus

PROVIDER: GSE544 | GEO | 2003/07/22

SECONDARY ACCESSION(S): PRJNA85295

REPOSITORIES: GEO

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Project description:Cows exposed to short day photoperiod (SD, 8L:16D) during the 60-day non-lactating period prior to parturition produce more milk in their subsequent lactation compared to cows exposed to long day photoperiod (LD,16L:8D). Although this response is well-established in dairy cows, the underlying mechanisms are not understood. We hypothesized that differential gene expression in cows exposed to SD or LD photoperiods during the dry period could be used to identify the functional basis for the subsequent increase in milk production during lactation. Pregnant, multiparous cows were maintained on a SD or LD photoperiod for 60-days prior to parturition. Mammary biopsies were obtained on days -24 and -9 relative to parturition and Affymetrix GeneChip® Bovine Genome Arrays were used to quantify gene expression. Sixty-four genes were differentially expressed (p ≤ 0.05 and fold-change ≥ |1.5|) between SD and LD treatments. Many of these genes were associated with cell growth and proliferation, or immune function. Ingenuity Pathway Analysis predicted upstream regulators to include TNF, TGFβ1, interferon γ and several interleukins. In addition, expression of 125 genes was significantly different between day -24 and day -9; those genes were associated with milk component metabolism and immune function. The interaction of photoperiod and time affected 32 genes associated with insulin-like growth factor (IGF-I) signaling. Genes differentially expressed in response to photoperiod were associated with mammary development and immune function consistent with the enhancement of milk yield in the ensuing lactation. Our results provide insight into the mechanisms by which photoperiod affects the mammary gland and subsequently lactation. Data were analyzed for the effect of photoperiod treatment (LD minus SD), time relative to parturition (day -24 minus day -9) and the interaction of photoperiod treatment and time ((LD minus SD day -9) minus (LD minus SD day -24))

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SAM PMN Parturition

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