Estrogen deficiency promotes cigarette smoke-induced changes in the extracellular matrix in the lungs of aging female mice.
Transl Res
; 178: 107-117, 2016 12.
Article
in En
| MEDLINE
| ID: mdl-27519148
ABSTRACT
Female smokers have a faster decline in lung function with increasing age and overall develop a greater loss of lung function than male smokers. This raises the question of whether estrogen status in women affects susceptibility to cigarette smoke (CS)-induced lung disease. Mouse models suggest that female mice are more susceptible than males to CS-induced lung disease. Moreover, young CS-exposed female mice develop emphysema earlier than male mice. The purpose of this study was to characterize the relationship of estrogen status on the pattern and severity of CS-induced lung disease. In this study, 15-month-old female C57BL/6J mice were ovariectomized and administered either placebo (pla) or 17ß-estradiol (E2, 0.025 mg) 2 weeks after ovariectomy. They were further divided into those that were exposed to CS and no-smoke controls (NSC). Mice were exposed to CS in stainless steel inhalation chambers 3 hours a day, 5 days a week for 6 months, and sacrificed after 24 weeks of CS exposure. Blood and urine were collected at sacrifice to measure estrogen and cotinine levels, a metabolite of nicotine. Uterine weight was recorded as an indicator of estrogen status. Results showed that CS in the absence of E2 induced a decrease in hydroxyproline content, macrophage number, and respiratory chain complex-1 protein. CS without E2 also resulted in an increase in matrix metalloproteinase-2 activity and apoptosis and a change in the ratio of estrogen receptor subtype. These findings were abrogated with administration of E2, suggesting that estrogen deficiency increases susceptibility to CS-induced lung disease.
Full text:
1
Collection:
01-internacional
Database:
MEDLINE
Main subject:
Aging
/
Smoking
/
Estrogens
/
Extracellular Matrix
/
Lung
Type of study:
Prognostic_studies
Limits:
Animals
Language:
En
Journal:
Transl Res
Journal subject:
MEDICINA
/
TECNICAS E PROCEDIMENTOS DE LABORATORIO
Year:
2016
Document type:
Article