Document Detail

Parity and short-term estradiol treatment utilizes similar cellular mechanisms to confer protection against breast cancer.
MedLine Citation:
PMID:  25116349     Owner:  NLM     Status:  In-Data-Review    
BACKGROUND: Protective effect of early pregnancy and short-term estrogen treatment (STET), against breast cancer is well established. The underlying mechanisms are not well understood. In this study, we compared the mammary gland cellular microenvironment influenced/induced by parity and STET alongside age-matched controls.
METHODS: Parous, STET, and control rats were injected with N-methyl-N-nitrosourea at 15 weeks and monitored for the development of mammary cancer. A subset of 4 rats were killed five weeks post carcinogen treatment and mammary gland samples were isolated and subjected to molecular analysis.
RESULTS: Our results demonstrated a reduction in cell survival, extracellular matrix associated proliferation, hormonal and growth factor receptor pathways in the experimental groups compared to control rats. Moreover, concomitant reductions in the EMT markers along with cell migration regulators were also observed in parous and STET groups. Hormonal receptor such as GHR, PR, ERα and growth factor receptors IGFR, EGFR and erbB2 were down regulated in the treatment groups. Further analysis revealed that parity and STET drastically reduced the expression, activation of JAK2 and nuclear localization of STATs.
CONCLUSION: Parity and STET by targeting major cell signaling pathways involved in cell survival, cell migration and cell death reduces the mammary tumor promoting environment. © 2014 S. Karger AG, Basel.
Arunkumar Arumugam; Ramadevi Subramani; Sushmita Nandy; Rebecca Lopez; Thiyagarajan Boopalan; Rajkumar Lakshmanaswamy
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Publication Detail:
Type:  Journal Article     Date:  2014-08-08
Journal Detail:
Title:  Cellular physiology and biochemistry : international journal of experimental cellular physiology, biochemistry, and pharmacology     Volume:  34     ISSN:  1421-9778     ISO Abbreviation:  Cell. Physiol. Biochem.     Publication Date:  2014  
Date Detail:
Created Date:  2014-08-13     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  9113221     Medline TA:  Cell Physiol Biochem     Country:  Switzerland    
Other Details:
Languages:  eng     Pagination:  491-505     Citation Subset:  IM    
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