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Immunoregulatory effects of two bone-marrow hexapeptides (myelopeptides) in experimental models of immunodeficiency
A A Mikhailova1, S Y Shanurin, R V Petrov
1Department of Immunology, Shemyakin-Ovchinnikov Institute of Bioorganic Chemistry, Russian Academy of Sciences, Moscow, Russia.
Abstract:
Myelopeptide 1 (MP-1, Phe-Leu-Gly-Phe-Pro-Thr) and myelopeptide 2 (MP-2, Leu-Val-Val-Tyr-Pro-Trp) are hexapeptides originally isolated from porcine bone-marrow cell culture. MP-1 enhanced the number of antibody-forming cells in NZB mouse spleen cells in vitro and increased the antibody production in Cy-treated (CBAxC57B1/6)F1 mice in vivo. MP-1 increased ConA-induced proliferation of both NZB spleen cells in vitro and spleen cells of Cy-treated mice in vivo. MP-1 restored polyclonal IgG synthesis depressed by PWM in the NZB spleen cell culture. MP-2 also evoked immunoregulatory effects which were less pronounced and realized at higher concentrations than effects of MP-1. Neither MP-1 nor MP-2 affected LPS-induced spleen cell proliferation in both NZB- and Cy-treated (CBAxC57B1/6)F1 mice.
Insights
Myelopeptide-1 (MP-1) enhances immune responses by boosting antibody production and spleen cell proliferation in mice. Myelopeptide-2 (MP-2) shows similar but weaker immunomodulatory effects.
Area of Science:
- Immunology
- Peptide Science
Background:
- Myelopeptides (MP-1 and MP-2) are hexapeptides derived from porcine bone marrow.
- These peptides are investigated for their potential immunomodulatory functions.
Purpose of the Study:
- To evaluate the immunoregulatory effects of MP-1 and MP-2.
- To assess their impact on antibody production and lymphocyte proliferation in mouse models.
Main Methods:
- In vitro and in vivo studies using NZB mouse spleen cells and cyclophosphamide-treated (CBAxC57B1/6)F1 mice.
- Assays included antibody-forming cell enhancement, Concanavalin A (ConA)-induced proliferation, and pokeweed mitogen (PWM)-induced IgG synthesis.
Main Results:
- MP-1 significantly enhanced antibody-forming cells and ConA-induced proliferation in vitro and in vivo.
- MP-1 restored polyclonal IgG synthesis suppressed by PWM.
- MP-2 demonstrated similar immunoregulatory effects but required higher concentrations.
- Neither peptide affected lipopolysaccharide (LPS)-induced spleen cell proliferation.
Conclusions:
- MP-1 exhibits potent immunomodulatory activity, enhancing specific and polyclonal antibody production and T-cell dependent proliferation.
- MP-2 also possesses immunoregulatory properties, albeit less potent than MP-1.
- These findings highlight the potential of myelopeptides as therapeutic agents in immune modulation.