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Expression Analysis of Solute Carrier (SLC2A) Genes in Milk Derived Mammary Epithelial Cells during Different Stages of Lactation in Sahiwal (Bos indicus) Cows
ISSN: 2329-888X
Advances in Dairy Research
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Expression Analysis of Solute Carrier (SLC2A) Genes in Milk Derived Mammary Epithelial Cells during Different Stages of Lactation in Sahiwal (Bos indicus) Cows

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Abstract

Solute carriers (SLC2A/ GLUT) are one of the major types of transporter superfamily that have been predominantly involved in active transport of glucose across the plasma membrane. Glucose uptake by mammary epithelial cells (MECs) is an important step in the milk synthesis during lactation, and hence directly influences the milk yield. Use of MEC isolated from milk has been speculated to be a good alternative to mammary gland tissues in order to understand the expression profile of important genes associated with lactation, in particular large dairy animals where obtaining biopsies is sometimes difficult. The present study was therefore undertaken in milk purified MECs to assess relative mRNA expression of major solute carriers/glucose transporters (SLC2A/GLUTs) viz., SLC2A1(GLUT1), SLC2A(GLUT4), SLC2A8(GLUT8), SLC2A12(GLUT12) and hexokinase (HK2) genes during; early(10-20 days), peak (30-50 days), mid (100-140 days) and late (215-245 days) lactation stages of Sahiwal cows. MECs were isolated from fresh milk, using Dyna Beads coated with anticytokeratin 18 antibodies. For normalization of qPCR expression data, 10 known housekeeping genes (HKGs) from different functional classes were evaluated. A panel of four best stable HKGs; eukaryotic translation elongation factor 1 alpha (EEF1A1), ribosomal protein L4(RPL4), glyceraldehyde-3-phosphate dehydrogenase (GAPDH), actin-beta (ACTB) were identified through ge Norm, Norm Finder and Best Keeper analysis. Expression level of SLC2A1 was significantly (P<0.05) higher during peak/mid lactation period as compared to late lactation period. Similarly, SLC2A8 mRNA expression was relatively higher during mid-lactation stages than other stages of lactation. In contrast, SLC2A4 expression level was relatively higher during the late lactation stages. The SLC2A12 mRNA on the other hand was undetectable, indicating its expression to be either very low or absent in MEC of Sahiwal cows. Our expression data indicated SLC2A1, SLC2A4 and SLC2A8 to be the major solute carriers in Sahiwal MEC. Further, HK2 expression was significantly (P<0.05) higher during early and mid-lactation stages. The stage specific expression about of major SLC2A/GLUT and HK2 genes indicate their functional role in regulating glucose uptake in MECs of Sahiwal cows.

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