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Title: CLOCK regulates mammary epithelial cell growth and differentiation
Authors: Casey, Theresa
Crodian, Jennifer
Suarez-Trujillo, Aridany 
Erickson, Emily
Weldon, Bethany
Crow, Kristi
Cummings, Shelby
Chen, Yulu
Shamay, Avi
Mabjeesh, Sameer J.
Plaut, Karen
UNESCO Clasification: 3109 Ciencias veterinarias
3104 Producción Animal
240113 Fisiología animal
Keywords: Circadian
Mammary development
Issue Date: 2016
Journal: American Journal of Physiology - Regulatory Integrative and Comparative Physiology 
Abstract: Circadian clocks influence virtually all physiological processes, including lactation. Here, we investigate the role of the CLOCK gene in regulation of mammary epithelial cell growth and differentiation. Comparison of mammary morphology in late-pregnant wild-type and ClockΔ19 mice, showed that gland development was negatively impacted by genetic loss of a functional timing system. To understand whether these effects were due, in part, to loss of CLOCK function in the gland, the mouse mammary epithelial cell line, HC11, was transfected with short hairpin RNA that targeted Clock (shClock). Cells transfected with shClock expressed 70% less Clock mRNA than wild-type (WT) HC11 cultures, which resulted in significantly depressed levels of CLOCK protein (P < 0.05). HC11 lines carrying shClock had four-fold higher growth rates (P < 0.05), and the percentage of cells in G1 phase was significantly higher (90.1 ± 1.1% of shClock vs. 71.3 ± 3.6% of WT-HC11) following serum starvation. Quantitative-PCR (qPCR) analysis showed shClock had significant effects (P < 0.0001) on relative expression levels of Ccnd1, Wee1, and Tp63. qPCR analysis of the effect of shClock on Fasn and Cdh1 expression in undifferentiated cultures and cultures treated 96 h with dexamethasone, insulin, and prolactin (differentiated) found levels were reduced by twofold and threefold, respectively (P < 0.05), in shClock line relative to WT cultures. Abundance of CDH1 and TP63 proteins were significantly reduced in cultures transfected with shClock. These data support how CLOCK plays a role in regulation of epithelial cell growth and differentiation in the mammary gland.
ISSN: 0363-6119
DOI: 10.1152/ajpregu.00032.2016
Source: American Journal Of Physiology-Regulatory Integrative And Comparative Physiology[ISSN 0363-6119],v. 311 (6), p. R1125-R1134
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