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2017 ; 7
(ä): 46485
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Estrogen reprograms the activity of neutrophils to foster protumoral
microenvironment during mammary involution
#MMPMID28429725
Chung HH
; Or YZ
; Shrestha S
; Loh JT
; Lim CL
; Ong Z
; Woo ARE
; Su IH
; Lin VCL
Sci Rep
2017[Apr]; 7
(ä): 46485
PMID28429725
show ga
Epidemiological studies have indicated increased risk for breast cancer within 10
years of childbirth. Acute inflammation during mammary involution has been
suggested to promote this parity-associated breast cancer. We report here that
estrogen exacerbates mammary inflammation during involution. Microarray analysis
shows that estrogen induces an extensive proinflammatory gene signature in the
involuting mammary tissue. This is associated with estrogen-induced neutrophil
infiltration. Furthermore, estrogen induces the expression of protumoral
cytokines/chemokines, COX-2 and tissue-remodeling enzymes in isolated mammary
neutrophils and systemic neutrophil depletion abolished estrogen-induced
expression of these genes in mammary tissue. More interestingly, neutrophil
depletion diminished estrogen-induced growth of ER?-negative mammary tumor 4T1 in
Balb/c mice. These findings highlight a novel aspect of estrogen action that
reprograms the activity of neutrophils to create a pro-tumoral microenvironment
during mammary involution. This effect on the microenvironment would conceivably
aggravate its known neoplastic effect on mammary epithelial cells.