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The Aging Human Lung Mucosa: A Proteomics Study.

Andreu Garcia-Vilanova¹, Angélica M Olmo-Fontánez^1,2, Juan I Moliva³

¹Population Health and Host Pathogen Interactions Programs, Texas Biomedical Research Institute, San Antonio, Texas, USA.

The Journals of Gerontology. Series A, Biological Sciences and Medical Sciences

|April 23, 2022

Summary

This summary is machine-generated.

Aging lungs show increased inflammation and oxidative stress, making older adults susceptible to infections. This study reveals key protein changes in alveolar fluid, highlighting neutrophils

Keywords:

Alveolar lining fluid Comparative proteomics Mass spectrometry Respiratory diseases

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Area of Science:

Pulmonary Medicine
Immunology
Proteomics

Background:

The aging population is growing, increasing the risk of respiratory infections.
Lung alveolar environments in older adults are pro-inflammatory and pro-oxidative, yet understudied.
Age-related biochemical changes in lung alveolar lining fluid (ALF) and cells can impair immune responses.

Purpose of the Study:

To investigate the molecular characteristics of the alveolar space in older adults.
To compare the proteomic profile of ALF in older versus younger individuals.
To identify key pathways and regulatory networks in the aging lung.

Main Methods:

Exploratory, quantitative proteomic profiling of soluble proteins in ALF.
Comparative analysis of ALF proteomes between older and younger adults.
Bioinformatic analysis to identify differentially expressed proteins and regulatory networks.

Main Results:

Identified 457 significantly differentially expressed proteins in older adult ALF.
Observed increased levels of matrix metalloproteinases, senescence markers, antimicrobials, and neutrophil granule proteins.
Suggests neutrophils contribute to the dysregulated alveolar environment in aging lungs.

Conclusions:

The aging lung's alveolar space exhibits a distinct, dysregulated proteomic profile.
Neutrophils may play a significant role in age-related pulmonary inflammation and immune dysfunction.
A hypothetical serum response factor-mediated network could explain observed neutrophilic profiles.