Proceedings of the Japan Academy

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Immature rats which had been primed with 5 I.U. PMS and 2 I.U. HCG were given a single injection of 50μg reserpine 2 days after HCG. A majority of the animals exhibited positive deciduomal reaction following uterine traumatization performed 4 days after reserpine injection. This finding together with the writer's previous report that immature rats similarly primed develop deciduomata in response to uterine trauma applied after cervico-vaginal stimulation (Takewaki, 1970) indicates that the hypothalamic mechanism involved in the regulation of hypophysial prolactin secretion is operative, at least in part, in immature rats.
Those animals which had been pretreated with 40 I.U. PMS and 20 I.U. HCG failed to form deciduomata in reaction to uterine trauma given after injection of 50μg reserpine. This is in harmony with the previous report that the endometrium is incapable of responding to trauma in such animals even in the presence of optimal combination of progesterone and estradiol supportive of deciduomal growth (Takewaki, 1969b).

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Some cytogenetic features of mycosis fungoides are described. Two chromosomally abnormal malignant cell lines are noted in each sample from skin tumor, enlarged lymph node, bone marrow and peripheral blood of the patient: the one is characterized by a large submetacentric marker (SM), and the other by two minute fragments. These two lines proliferate predominantly in the in vivo environment of blood and lymph node, while they show an extremely low proliferative ability in non-PHA and PHA-treated cultures.

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Somatic chromosomes of Apodemus giliacus, a new form from Hokkaido, are investigated. The diploid numbers show a wide variation in different individuals. Chromosomal data are presented in some detail in Tables I and II. Many karyotypic variabilities observed are not explicable by a simple mechanism, though there are some which are in favor of the Robertsonian interpretation.

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RNA preparations extracted from mice immunized with Salmonella flagella were capable of inducing immunological memory cells in recipient animals which were then capable of responding to a secondary stimulus with an antigen and producing a high titer of serum antibody. However, secondary responses were not able to be induced by injections of immune RNA preparations in mice primed with either Salmonella flagella or immune RNA preparations.

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