Early down-regulation of milk production after weaning by pup removal and prior to involution in mouse mammary glands

被引:21
作者
Uejyo, Takaaki [1 ]
Kuki, Chinatsu [1 ]
Oyama, Shoko [1 ]
Kumura, Haruto [1 ]
Kobayashi, Ken [1 ]
机构
[1] Hokkaido Univ, Res Fac Agr, Lab Dairy Food Sci, Sapporo, Hokkaido 0608589, Japan
基金
日本学术振兴会;
关键词
Mammary gland; Alveolar epithelial cell; Involution; Lactation; Weaning; EPITHELIAL-CELLS; SECRETORY EPITHELIUM; LIPID-SYNTHESIS; LACTATING MICE; MESSENGER-RNA; KEY STAGES; EXPRESSION; APOPTOSIS; PROTEIN; PREGNANCY;
D O I
10.1007/s00441-014-2013-7
中图分类号
Q2 [细胞生物学];
学科分类号
071009 ; 090102 ;
摘要
The mammary gland is a highly specialized organ that is able to repeat development and regression (involution) of alveolar structures for milk production. Mammary involution consists in two phases. The first phase is reversible and lasts until approximately 48 h after weaning in mice. Interestingly, an extended milking interval can change the milk-secretory activity of alveolar epithelial cells (AECs) before the first phase of involution begins. In this study, we investigate the changes in the ability of AECs to secrete milk during the involution progression. Careful observation of the number and locations of cleaved caspase-3 positive AECs revealed that the first phase of involution occurred approximately 24 h after weaning and the second phase began between 48 and 72 h after weaning. However, initial changes in the milk production ability of AECs began just 1 h after weaning and milk production gradually ceased within 24 h. In addition, activation of STAT3 and inactivation of STAT5 had occurred in some AECs by 6 h after weaning and more broadly by 24 h. In addition, milk production processes such as nutrient uptake, synthesis, and secretion ceased by 24 h post-weaning. Interestingly, enlarged cytoplasmic lipid droplets were observed in AECs 12 h after weaning even though the expression levels of genes relevant to triglyceride production (Srebp1 and AQP3) were down-regulated. These results indicate that several changes in the milk production ability of AECs occur during expanded suckling intervals and prior to involution.
引用
收藏
页码:643 / 653
页数:11
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