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Thymosin alpha 1 and thymosin beta 4 modulate human colonic lamina propria lymphocyte function
Y Elitsur1, M G Mutchnick, W A Sakr
1Department of Pediatrics, Children's Hospital of Michigan, Detroit.
Immunopharmacology
|September 1, 1990
Summary
Thymosin alpha 1 and thymosin beta 4 peptides suppress human colonic lymphocyte proliferation. Their mechanism may involve protein kinase C, not calcium fluxes or ornithine decarboxylase pathways.
Area of Science:
- Immunology
- Gastroenterology
Background:
- Thymosin alpha 1 and thymosin beta 4 are peptides derived from thymosin fraction 5.
- These peptides are known to modulate various immune functions in human and animal models.
Purpose of the Study:
- To investigate the effects of thymosin alpha 1 and thymosin beta 4 on human colonic lamina propria lymphocyte (LPL) proliferation.
- To examine the impact of these thymosin peptides on ornithine decarboxylase (ODC) activity in LPL.
Main Methods:
- Human colonic lamina propria lymphocytes (LPL) were isolated from eighteen colon specimens.
- LPL were cultured with or without thymosin alpha 1 and thymosin beta 4.
- Thymidine incorporation and ornithine decarboxylase (ODC) activity were measured.
Main Results:
- Both thymosin alpha 1 and thymosin beta 4 significantly suppressed thymidine incorporation into LPL.
- Neither peptide altered thymidine incorporation in phorbol ester (PDB) and calcium ionophore (ionomycin)-stimulated LPL.
- Thymosin alpha 1 and thymosin beta 4 did not affect ODC activity in Con A-stimulated LPL.
Conclusions:
- Thymosin alpha 1 and thymosin beta 4 inhibit human colonic LPL proliferation.
- The inhibitory mechanism may involve protein kinase C rather than calcium fluxes or the ODC pathway.
- These thymosin peptides might play a role in modulating the human mucosal immune system.