[Effect of calcitonin on lymphoid tissue cells in vitro]

Calcitonin effect on lymphoid cells of the marrow, thymus, spleen and lymphoid nodes was studied on guinea-pigs and CBA mice. Calcitonin increased ThyI+ cell number in the marrow and thymus, restored rosette-forming ability of the thymus lymphocytes, heated at 45 degrees C within 1 hour, inducing an appearance of heteroerythrocyte receptors on their surface. The data obtained allow a conclusion that calcitonin is a substance, influencing the lymphoid tissue cell differentiation.