ACTA VETERINARIA ET ZOOTECHNICA SINICA ›› 2015, Vol. 46 ›› Issue (1): 77-84.doi: 10.11843/j.issn.0366-6964.2015.01.010

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Study on ISG15 and OAS1 Transcriptions in Peripheral Blood of Dairy Cows during Early Pregnancy

CHENG Lei*,WANG Ding-fa,LIU Xiao-hua,XIANG Min,LING Ming-hu,HU Xiu-zhong,XIA Yu   

  1. (Institute of Animal Science and Veterinary Medicine,Wuhan Academy of Agricultural Sciences,Wuhan 430208,China)
  • Received:2014-07-11 Online:2015-01-23 Published:2015-01-23

Abstract:

This study aimed to investigate mRNA transcriptions of interferon stimulated genes ISG15 and OAS1 in the peripheral blood of Chinese Holstein dairy cows during early pregnancy,by which we hope to provide an insight into their applications in bovine early pregnancy diagnosis.A total of 27 heifers following spontaneous estrus(n=10) or oestrus synchronisation(n=17) were used for the study.Peripheral blood were collected at 0,14,18,21 and 28 d post artificial insemination(AI);subsets of peripheral blood leukocytes(lymphocyte,monocyte,and natural killer cell) were isolated at 0,18 and 21 d;Real-time PCR was employed to detect the relative mRNA transcriptions of ISG15 and OAS1 in the whole white blood cells(WBC) and/or the leukocyte subpopulations.The results showed that bovine ISG15 and OAS1 in the peripheral blood of pregnant cows were significantly elevated versus non-pregnant cows at 18 d(P<0.05);On 18 d post AI,ISG15 was up-regulated in pregnant cows with the average fold change(FC) of 3.92,whereas it was down-regulated in non-pregnant cows with the average FC of 1.46;OAS1 was similarly up-regulated(FC=3.49) in pregnant cows and down-regulated(FC=1.28) in non-pregnant cows.The relative transcriptions of ISG15 and OAS1 in pregnant cows following spontaneous estrus were significantly higher than those in non-pregnant cows at 18 d post AI;although the tendency in cows following oestrus synchronisation was the same,the difference was not statistically significant.Further analysis in the subpopulations of leukocytes showed that OAS1 in lymphocytes of pregnant cows was significantly elevated(+2.14),whereas depressed in non-pregnant cows (-1.80) at 18 d post AI(P<0.05).The results indicated that regulations of ISG15 in peripheral blood of pregnant cows were more obvious than OAS1 at 18 d after AI;differential expressions of ISG15 and OAS1 between pregnant cows and non-pregnant cows were more obvious in cows following spontaneous estrus.In conclusion,ISG15 transcriptions in peripheral WBC could be a better indicator for bovine early pregnancy diagnosis(18 d post AI),especially in cows following spontaneous estrus.Gene expression analysis of bovine ISG15 and OAS1 in the leukocyte subsets has provided additional insight into their roles during early maternal recognition of pregnancy.

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