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[Specificity of the effect of growth hormone on DNA concentration in the nuclei of the lymphoid cells of hypophysectomized rats].

The effect of growth hormone on the DNA content in the nuclei of the thymus, spleen and the lymph node lymphocytes was studied by means of cytophotometry. In hypophysectomized rats the growth hormone increased the DNA content in the nuclei of the middle lymphocytes of these organs without altering its amount in the small lymphocytes. Thymus lymphocytes were the most sensitive to the hormone action. The DNA content in the nuclei of these cells increased as soon as one hour after the administration of the hormone; in 4 hours it reached the maximum. Other hormones with an anabolic effect (insulin, thyroxin, testosterone), induced no elevation of DNA in the thymocyte nuclei at that period of time. A conclusion was drawn on the high tropicity of the growth hormone to the cells of the lymphoid organs and particularly to the thymocytes (middle lymphocytes of the thymus).