Immunosuppressive effects of cyclophosphamide in pigs

Area of Science:

• Immunology
• Pharmacology

Background:

• Cyclophosphamide (CY) is an alkylating agent used in chemotherapy.
• Its effects on the immune system, particularly in swine, require detailed investigation.

Purpose of the Study:

• To evaluate the impact of cyclophosphamide on leukocyte counts, lymphoid tissue cellularity, and antibody response in pigs.
• To understand the recovery kinetics of the immune system post-CY treatment.

Main Methods:

• Pigs received intraperitoneal injections of cyclophosphamide (30 mg/kg) at 2-day intervals.
• Leukocyte counts, lymphocyte subsets (B and T cells), and lymphoid tissue cellularity were assessed.
• Antibody production against sheep erythrocytes was measured.

Main Results:

• CY treatment led to significant reductions in total leukocytes, neutrophils, and lymphocytes.
• B-lymphocyte percentages and counts were markedly depleted (80% and 90%, respectively), while T-cell counts decreased by 50%.
• Lymphoid tissues showed lymphocyte depletion, particularly in B-dependent areas, with recovery beginning 4 days post-treatment. Antibody response was suppressed for at least 10 days.

Conclusions:

• Cyclophosphamide profoundly impacts swine immune cell populations and lymphoid organs.
• The drug suppresses humoral immunity, with a prolonged recovery period.
• These findings highlight CY's potent immunomodulatory effects in pigs.