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Effect of age on mast cell granules
International Archives of Allergy and Applied Immunology
|January 1, 1981
Summary
Rat mast cells show increased volume and granule content with age. Protease levels rise disproportionately in older rats, suggesting specific granule component regulation.
Area of Science:
- Cell Biology
- Immunology
- Histology
Background:
- Rat mast cells in the peritoneal cavity are proposed to have long lifespans with minimal granule turnover.
- Mast cell volume increases with rat age, impacting organelle structure and function.
Purpose of the Study:
- To investigate the age-related changes in the quantity of secretory granule constituents in rat mast cells.
- To understand the structural and functional dynamics of mast cell organelles over time.
Main Methods:
- Analysis of histamine, heparin, beta-glucuronidase, and mast cell protease levels in rat mast cells.
- Comparison of granule component quantities with mast cell volume across different age groups (from young to 6-month-old rats).
- Assessment of granule isolation efficiency based on age.
Main Results:
- Mast cell volume and the quantities of histamine, heparin, and beta-glucuronidase increase in parallel with rat age.
- Mast cell protease shows a disproportionate increase relative to cell volume and other granule components between 3- and 6-month-old rats.
- Immature granules from younger rats (≤1 month) are more challenging to isolate with intact membranes.
Conclusions:
- Rat mast cell granule composition changes with age, with protease exhibiting unique age-dependent regulation.
- These findings contribute to understanding mast cell maturation, longevity, and secretory granule dynamics.