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Bacterial translocation and wasting in stressed mice
F García Tamayo1, L I Terrazas Valdés, N Malpica López
1Departamento de Biología, Facultad de Química, Universidad Nacional Autónoma de México, México, D.F.
Archives of Medical Research
|January 1, 1996
Summary
Chronic stress in newborn mice led to severe weight loss and immunodeficiency, increasing bacterial translocation from the gut. This study highlights stress impacts on immune function and gut barrier integrity.
Area of Science:
- Immunology
- Microbiology
- Stress Physiology
Background:
- Stress significantly impacts physiological functions, including the immune system.
- Bacterial translocation from the gut can lead to systemic infections.
- The effects of chronic stress on newborn immune development and gut integrity are not fully understood.
Purpose of the Study:
- To investigate the effects of chronic stress on immune function in newborn mice.
- To examine bacterial translocation from the intestine to visceral organs under stress.
- To correlate stress-induced immunodeficiency with bacterial dissemination and wasting.
Main Methods:
- Newborn CD1 mice were subjected to chronic intraperitoneal injections of heat-killed staphylococci (stress group) or saline (control group) for 4 weeks.
- Evaluated parameters included clinical condition, bacterial presence in organs, splenic cell mitochondrial activity, lymphocyte proliferation (Concanavalin-A), and in vitro antibody production.
- Bacterial translocation was assessed in mesenteric lymph nodes, liver, and spleen.
Main Results:
- Stressed mice exhibited significant weight loss and immunodeficiency, characterized by reduced lymphocyte proliferation and antibody production.
- Splenic cells from stressed mice showed increased mitochondrial activity (tetrazolium reduction).
- Bacterial dissemination from the intestine to mesenteric lymph nodes was confirmed in stressed mice.
Conclusions:
- Chronic biological stress in newborn mice induces severe immunodeficiency and weight loss.
- Stress facilitates bacterial translocation from the intestine to lymphoid tissues.
- A correlation between bacterial dissemination and wasting development is proposed, suggesting stress-induced gut barrier dysfunction.