Long-term smoking contributes to aging frailty and inflammatory response

Area of Science:

• Gerontology
• Toxicology
• Immunology

Background:

• Frailty in the elderly is a growing health concern, exacerbated by environmental factors like cigarette smoke.
• Limited quantitative data exists on the dose-dependent impact of smoking on frailty in older adults.

Purpose of the Study:

• To quantitatively assess the impact of varying smoking dosages on frailty in elderly mice.
• To investigate the correlation between smoking, frailty, and inflammatory markers in both animal models and human samples.

Main Methods:

• Elderly mice were exposed to low, medium, and high dosages of cigarette smoke for 30 days.
• Frailty was assessed using grip strength and rotation tests; lung histopathology and inflammatory markers (TNF-α, IL-1β) were analyzed.
• Human data from the Gene Expression Omnibus (GEO) database was used for validation.

Main Results:

• High-dose smoke exposure significantly increased frailty in mice, evidenced by reduced grip strength and drop time (P < 0.01).
• Elderly smokers showed a higher prevalence of frailty (69.2%) compared to non-smokers (15.4%).
• Both mice and humans exhibited elevated TNF-α and IL-1β, activating the NF-κB pathway.

Conclusions:

• This study provides quantitative evidence linking smoking dosage to frailty in the elderly.
• Elevated TNF-α and IL-1β levels are key mediators in smoking-induced frailty.
• Findings support the diagnosis and prevention of frailty in elderly smokers.