VARYING INFLUENCE OF TUBERCULOUS RABBIT PLASMA ON THE GROWTH OF FIBROBLASTS IN VITRO

Area of Science:

• Immunology
• Cell Biology
• Microbiology

Background:

• Tuberculosis (TB) is a significant infectious disease caused by Mycobacterium tuberculosis.
• Understanding the host's physiological response to TB infection is crucial for developing effective treatments.
• Alterations in host plasma composition during infection may influence cellular behavior.

Purpose of the Study:

• To investigate the effect of plasma from tuberculous rabbits on fibroblast cell growth.
• To determine if the timing of plasma collection influences its effect on cell proliferation.
• To explore potential factors in the plasma associated with observed growth effects.

Main Methods:

• Rabbits were inoculated with bovine tubercle bacilli.
• Plasma was collected at different time points post-inoculation (within 3-4 months and after 4 months).
• The effect of collected plasma on the growth of rabbit fibroblast transplants was assessed.

Main Results:

• Plasma collected within 3-4 months post-inoculation exhibited growth-inhibitory effects on fibroblast transplants.
• Plasma collected after 4 months post-inoculation demonstrated growth-stimulating effects on fibroblast transplants.
• The study suggests a link between early growth inhibition and lipoidemia, and later growth stimulation and leucocytosis.

Conclusions:

• Host plasma composition changes dynamically during tuberculosis progression.
• Early-stage tuberculosis plasma may contain factors that suppress cell growth, potentially related to lipid metabolism changes (lipoidemia).
• Later-stage tuberculosis plasma may contain factors that promote cell growth, possibly associated with inflammatory responses (leucocytosis).