Related Experiment Videos
[Effect of aging on the mode of Mycobacterium intracellulare infection]
Abstract:
Effect of aging on the mode of Mycobacterium intracellulare infection was examined using female ddy strain mice of 6, 12, 24, 48, 64 and 80 weeks old. When mice were infected intravenously with M. intracellulare 31F093 (8 x 10(7] and the incidence and the degree of gross lesions in the lungs and viable number of the organisms in the lungs and spleen were studied at 8 weeks after bacterial challenge, there was no marked difference in the grade of pathological lesions by age. However, all the mice younger than 25-weeks of age survived over the period of 8 weeks after infection, whereas about 30% of mice older than 48-weeks of age died during the course of infection. Thus, it is thought that some parts of old mice were more susceptible to M. intracellulare infection than young mice on the basis of their survival.
Insights
Older mice showed increased susceptibility to Mycobacterium intracellulare infection, with higher mortality rates compared to younger mice despite similar lesion severity. This highlights aging as a key factor in infection outcomes.
Area of Science:
- Microbiology
- Immunology
- Gerontology
Context:
- Aging significantly impacts immune responses and susceptibility to infectious diseases.
- Mycobacterium intracellulare infections can pose a threat, particularly to vulnerable populations.
- Understanding age-related differences in infection is crucial for public health.
Purpose:
- To investigate the effect of host age on the outcome of Mycobacterium intracellulare infection.
- To compare lesion development and survival rates in mice of different ages following infection.
Summary:
- Female ddy mice of varying ages (6-80 weeks) were intravenously infected with Mycobacterium intracellulare.
- While pathological lesions in lungs were similar across age groups, older mice (≥48 weeks) exhibited significantly higher mortality (approx. 30%) compared to younger mice (<25 weeks), all of whom survived.
- Survival data suggests increased susceptibility to M. intracellulare infection in older mice.
Impact:
- This study reveals a critical age-dependent vulnerability to Mycobacterium intracellulare infection.
- Findings suggest that aging compromises the host's ability to combat this specific mycobacterial infection.
- Highlights the need for age-specific considerations in managing Mycobacterium intracellulare infections.