title: Peculiarities of immunocorrective effects of the bone marrow regulatory peptides (myelopeptides).
abstract: Myelopeptides (MPs) are low-molecular-weight immunoregulatory peptides of bone marrow origin. The peculiarities of their immunoregulatory effects are demonstrated with two of the six synthesized MPs, MP-1 (Phe-Leu-Gly-Phe-Pro-Thr) and MP-2 (Leu-Val-Val-Tyr-Pro-Trp). It is shown that MP action is directed to the damaged links of immunity. MP-1 enhances a decreased level of antibody production in cyclophosphamide (Cy)-treated mice, but does not influence the antibody formation in normal animals. MP-2 inhibits the tumor growth more in a tumor-bearing organism as the tumor size gets larger, insofar as MP-2 antitumor effect is concerned, by its ability to recover functional activity of T lymphocytes suppressed by tumor products. Selective immunocorrective effects of MPs are based on ligand-receptor interactions. Using FITC-labeled MP-1 and [3H]-labeled MP-2, specific binding of these peptides with appropriate cell populations is shown. The cytofluorimetric analysis revealed a target cell for MP-1--CD4+ T lymphocyte (T helper). The data obtained suggest that MPs are endogenic immunoregulators which participate in the maintenance of immune homeostasis.
authors.affiliation: Department of Immunology, Shemyakin and Ovchinnikov Institute of Bioorganic Chemistry, Russian Academy of Sciences, Miklukho-Maklaya Street, 16/10, 117997, Moscow, Russia. stas@ibch.ru
authors.forename: Augusta
authors.initials: A
authors.lastname: Mikhailova
authors.forename: Larissa
authors.initials: L
authors.lastname: Fonina
authors.forename: Elena
authors.initials: E
authors.lastname: Kirilina
authors.forename: Sergey
authors.initials: S
authors.lastname: Gur'yanov
authors.forename: Mikhail
authors.initials: M
authors.lastname: Efremov
authors.forename: Rem
authors.initials: R
authors.lastname: Petrov
mesh_terms: D000818:Animals; D005260:Female; D051379:Mice; D008810:Mice, Inbred C57BL; D008808:Mice, Inbred CBA; D009842:Oligopeptides / Q000737:chemistry / Q000276:immunology*
chemical_list: D009842:Oligopeptides; C048617:myelopeptides