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Chronic lung inflammation in aging mice.

Kazutetsu Aoshiba¹, Atsushi Nagai

¹First Department of Medicine, Tokyo Women's Medical University, 8-1 Kawada-cho, Shinjuku-ku, Tokyo 162-8666, Japan. kaoshiba@chi.twmu.ac.jp

|July 14, 2007

Summary

Aging is linked to increased lung inflammation in mice. Aged mice showed higher expression of inflammation-related genes and more immune cells in their lungs, indicating a pro-inflammatory shift.

Area of Science:

Immunology
Aging Research
Respiratory Medicine

Background:

Aging is a complex process that can affect various physiological systems.
The lung is susceptible to age-related changes, including inflammation.
Understanding these changes is crucial for addressing age-related respiratory diseases.

Purpose of the Study:

To investigate if aging induces a pro-inflammatory shift in the mouse lung.
To analyze inflammation-related gene expression in aged versus young mouse lungs.
To identify specific immune cell populations that increase with lung aging.

Main Methods:

Comparative analysis of lung tissue from young (12-week-old) and aged (24-month-old) Balb/c mice.
Gene expression profiling using cDNA microarray and quantitative reverse transcription-polymerase chain reaction (qRT-PCR).

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Immunohistochemistry to quantify immune cell infiltration in lung tissue.

Main Results:

Eight inflammation-related genes (CD20, Burkitt lymphoma receptor 1, CXCR-3, provirus integration site for Moloney murine leukemia virus-2, CD72, IL-8RB, C-Fgr, and CD8beta) were significantly upregulated in aged mice.
Aged mice lungs exhibited increased numbers of CD4+ T cells, CD8+ T cells, B cells, and macrophages.
These molecular and cellular changes indicate a heightened inflammatory state in the lungs of aging mice.

Conclusions:

Aging is associated with a pro-inflammatory shift in the mouse lung.
Upregulation of specific immune genes and increased immune cell presence characterize lung aging.
These findings provide insights into the mechanisms underlying age-related pulmonary inflammation.