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Serosuppression in experimental filariasis.

P J Lammie, S P Katz, W H Anderson

Clinical and Experimental Immunology

|March 1, 1984

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Serum from chronically Brugia pahangi infected jirds suppresses immune responses to parasite antigens. This immunosuppression is dose-dependent and linked to specific serum components, offering insights into filariasis immunopathology.

Area of Science:

Immunology
Parasitology
Veterinary Medicine

Background:

Cellular immunoregulation in Brugia pahangi infected jirds is known.
The role of serum factors in this infection's immunopathology remains unexamined.

Purpose of the Study:

To investigate the effect of jird serum on immune cell responsiveness.
To determine if serum from infected jirds modulates mitogen and antigen responses.

Main Methods:

Assessed mitogen responsiveness of spleen cells from uninfected jirds.
Evaluated antigen responsiveness of lymph node cells (LNC) from infected jirds.
Used heat-inactivated jird serum and Sephadex G-200 chromatography for analysis.

Main Results:

Related Experiment Videos

Serum from chronically infected jirds (≥20 weeks) dose-dependently suppressed LNC antigen responsiveness.
Suppression was highest in chronically infected (30 weeks) and minimal in acutely infected (4 weeks) or microfilaremic (10 weeks) jirds.
Inhibition of mitogen responses was intermittent and less potent than antigen-specific suppression; suppressor activity localized to void volume and IgG peaks.

Conclusions:

Serum factors, particularly in chronic Brugia pahangi infection, contribute significantly to immunosuppression.
These findings highlight the role of serum-mediated immunoregulation in filariasis.
Further characterization of these serum factors could inform therapeutic strategies.