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PubMed1979

Respective influence of extrinsic and intrinsic factors on the age-related decrease of thymic secretion.

The serum level of a circulating thymic factor (FTS) described in our laboratory diminishes in mice after adult thymectomy and with age. However, thymuses from old mice, when grafted into young adult thymectomized recipients lacking circulating FTS, can still partially restore the circulating FTS level of the recipients, whereas newborn thymuses are less efficient in restoring the serum level of FTS in old recipients than in young adult thymectomized recipients. Taken together, our results suggests that in addition to an intrinsic deficiency of the thymic secretion, "environmental" factors play a role in the disappearance of circulating FTS with age, the more so since we observed in old mouse sera factors inhibiting the in vitro biologic activity of FTS, factors that are absent from young mouse sera.

Aging↗
PubMed1979

Effect of different components of the thymic stroma on the onset of AKR leukaemia.

Spontaneous leukaemia in AKR mice is characterized by an accumulation of thymocyte precursors prior to the onset of the disease. An insoluble thymic fraction (ITF), previously shown to provoke such an accumulation when injected to normal mice, caused a significant acceleration of death by leukaemia when given to pre-leukaemic AKR mice. Conversely, the injection of a soluble thymic factor (STF), believed to further differentiate thymocyte precursors, was shown to markedly delay the onset of leukaemia. These results are interpreted as reflecting the specific immune functions of T cells at different stages of maturation.

AKR murine leukemia virus↗
PubMed1983

Which thymic hormone?

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Clinical Trials as Topic↗