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Propionate regulates lymphocyte proliferation and metabolism
1Department of Physiology and Biophysics, São Paulo University, Brazil.
General Pharmacology
|May 1, 1993
Summary
Propionate, a short-chain fatty acid, can stimulate or inhibit lymphocyte proliferation depending on concentration. It impacts lymphocyte metabolism, notably by inhibiting lipid synthesis, which may explain reduced proliferation.
Area of Science:
- Immunology
- Cell Biology
- Biochemistry
Background:
- Lymphocytes play a crucial role in immune responses.
- Short-chain fatty acids (SCFAs) are produced by gut microbiota and can influence host physiology.
- The specific effects of propionate on lymphocyte function require further elucidation.
Purpose of the Study:
- To investigate the impact of propionate on lymphocyte proliferation and metabolism.
- To explore the underlying mechanisms by which propionate affects lymphocytes.
Main Methods:
- Human T lymphocytes and rat T and B lymphocytes were cultured.
- Lymphocyte proliferation was assessed by [3H]thymidine incorporation.
- Metabolic analyses included substrate utilization, oxidation, and lipid synthesis assays.
Main Results:
- Low propionate concentrations (0.04-1.0 mmol/l) stimulated lymphocyte proliferation.
- Higher propionate concentrations (2-5 mmol/l) markedly inhibited proliferation.
- Propionate inhibited lymphocyte lipid synthesis from [1-14C]acetate and [3H]2O incorporation into lipids.
Conclusions:
- Propionate exhibits dose-dependent effects on lymphocyte proliferation.
- Inhibition of lymphocyte lipid synthesis is a potential mechanism for propionate-induced proliferation reduction.
- Propionate metabolism in lymphocytes produces succinate but has low oxidation rates.