Effect of tripeptides on lymphoid and stem cells

Area of Science:

• Biochemistry
• Immunology
• Cell Biology

Background:

• Tripeptides are small peptides with diverse biological functions.
• Investigating the effects of specific tripeptides on cell proliferation and immune responses is crucial for understanding their therapeutic potential.

Purpose of the Study:

• To evaluate the impact of tripeptides T-36 and T-38 on the proliferation of various cell types, including embryonic mesenchymal stem cells, fibroblasts, and cancer cells.
• To assess the effects of these tripeptides on immune cell functions, such as lymphocyte and granulocyte activities.

Main Methods:

• Cell culture techniques were used to grow primary trypsinized embryonic mesenchymal stem cells, rat transplantable KF-1 fibroblasts, and human erythromyelosis K-562 cells.
• Tripeptides T-36 and T-38 were applied at concentrations of 0.1, 1, and 10 ng/ml.
• Proliferation, survival, adhesion, cytotoxicity, and bactericidal activities of various immune cells were measured.

Main Results:

• Tripeptides T-36 and T-38 significantly inhibited the proliferation of embryonic mesenchymal stem cells, KF-1 fibroblasts, and K-562 cells.
• These tripeptides did not affect lymphocyte survival or their adhesive, cytotoxic, and induced proliferative activities.
• Tripeptides did not alter granulocyte engulfment or bactericidal activities.
• T-36 at 0.1 ng/ml enhanced the spontaneous proliferation of normal lymphocytes.

Conclusions:

• The observed inhibition of cancer cell proliferation suggests potential antitumor activity of tripeptides T-36 and T-38.
• Tripeptides appear to stimulate nontumor immune cells in adults, indicating a potential role in immune system enhancement.