Abstract
We studied cell composition of the pineal lymphoid tissue and the effect of peptides on its differentiation and proliferation capacity. It was shown that the lymphoid component of the pineal gland in organotypic culture is primarily presented by low-differentiated CD5(+)-lymphocytes, while mature T and B cells are less abundant. Dipeptide vilon stimulates differentiation of precursors into T-helpers, cytotoxic T lymphocytes, and B cells, while tetrapeptide epithalon stimulated their differentiation towards B cells. Tripeptide vesugen had no effect on differentiation capacity of immune cells of the pineal gland, but enhanced their proliferation potential. Thus, dipeptide vilon acts as an inductor of differentiation of pineal immune cells, which can play an important compensatory role in age-related atrophy of the thymus, the central organ of the immune system.
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