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Biomedical subjects

T Motohashi

Publications and source records attributed to T Motohashi.

12 recordsLinked to original sources
PubMed1979

Changes in sex hormones and calcium regulating hormones with reference to bone mass associated with aging.

Measurement of bone mineral content (BMC), intestinal 47Ca absorption, and calcium regulating hormones and sex steroids in serum were performed on 32 healthy aged subjects and 26 control young subjects. In BMC, there was a progressive fall after age 40, with the rate of decrease being greater in women than in men. A significant correlation was observed between BMC and testosterone in the men and between estrogens and BMC in the women, suggesting the possible importance of testosterone in men and estrogens in women in maintaining bone mass. Plasma PTH showed no change with age. However, the reserve capacity of the parathyroid was significantly reduced in the aged women. Serum levels of ionized calcium were low in aged subjects, indicating a possible alteration with age in the feedback control between ionized calcium levels and parathyroid hormone secretion. C-cell funtion was also decreased with age. Plasma 1,25-(OH)2D and 47Ca absorption tended to decrease with age. Age-related bone loss could be a reflection of the interaction of these hormonal imbalance occurring with age.

Adolescent↗
PubMed1977

Isolation and assay of rabies serogroup viruses in CER cells.

Infection of CER cell cultures with field strains of rabies virus, ranging from 0 to 5 mouse brain passages, was detected by immunoflurescence within 2-4 days after infection. A fluorescent focus assay for measuring infectivity of seven rabies serogroup viruses was rapid and reproducible. Rabies field strians and other rabies serogroup viruses also induced cytopathic effect, usually on initial passage. The hemadsorption-negative (HAD-) plaque test in BSC-1 cells was successfully applied to laboratory-adapted rabies strains. HAD- test attempts were unsuccessful with CER cells and with field isolates of rabies virus in both cell lines. CER cells are heteroploid and are antigenically related to BHK-21 cells by fluorsecent antibody tests.

Antigens, Viral↗
PubMed1976

An enzymologic study of corpora lutea in early pregnant rats treated with abortifacient agents.

Luteal metabolism was investigated in corpora lutea of early pregnant rats treated with four abortifacient agents. In corpora lutea of rats treated with prostaglandin F2alpha or of rats 1 day postpartum, glucose-6-phosphate dehydrogenase (G6PDH) activity increased 140 to 170% and 20alpha-hydroxysteroid dehydrogenase (20alpha-HSD) was activated to significantly high levels, whereas malic enzyme activity decreased to 29% of control values. In aminoglutethimide-treated rats, the activities of G6PDH and malic enzyme decreased, while 20alpha-HSD activity was maintained at a very low level. With the increased dose, complete abortion was observed. In corpora lutea of these aborted rats, 20alpha-HSD was activated moderately and G6PDH values were slightly higher than control values, whereas malic enzyme activity fell to lower levels. All rats treated with clomiphene citrate aborted within 63 hours after the last injection. The activities of G6PDH, malic enzyme, and ATP citrate lyase in these corpora lutea decreased to 66, 68, and 72% of control levels, respectively; 20alpha-HSD activity was maintained at a very low level, and activities of 3beta-hydroxysteroid dehydrogenase, 6-phosphogluconate dehydrogenase, and pyruvate kinase were not appreciably altered. These findings indicated that, at the beginning of luteolysis and fetal resorption, the activities of steroidogenic enzymes decreased and 20alpha-HSD was not yet activated. Therefore, we could gauge the early changes of luteolysis by measuring the activities of G6PDH, MALIC ENZYME, AND ATP citrate lyase as well as 20alpha-HSD.

ATP Citrate (pro-S)-Lyase↗
PubMed1976

Free and protein-bound plasma estradiol-17 beta during the menstrual cycle.

Methods are described for the measurement of the estradiol-binding capacity of TeBG and of the free, TeBG-bound, and non-specifically protein-bound fractions of plasma estradiol. Each determination used undiluted plasma at 37 C, and a total volume of less than 2.0 ml of plasma was required to complete all the assays. The measurement of the per cent of free estradiol was affected by changes in plasma dilution. The measurement of the other fractions of estradiol was not influenced by changes in either the dilution or the volume of plasma. The distribution of plasma estradiol was determined daily throughout 5 individual menstrual cycles. The per cent of free, the per cent of TeBG-bound, and the TeBG binding capacity of estradiol remained constant throughout the cycle with mean values of 2.21 +/- 0.04% (SE), 38.4 +/- 0.7%, and 16.6 +/- 0.43 ng/ml, respectively. The mean association constant of TeBG for estradiol was 6.58 +/- 0.25 x 10(7)M-1. The concentration of the free and non-specifically protein-bound fractions of estradiol paralleled the total plasma concentration of estradiol. The results show that biologic events related to normal cyclic changes of plasma estradiol may be attributed to fluctuations in the free estradiol and to estradiol which is bound with low affinity to non-specific plasma proteins.

Estradiol↗
PubMedDate not supplied

The influence of acupuncture stimulation on plasma levels of LH, FSH, progesterone and estradiol in normally ovulating women.

This is the first attempt to elucidate the direct effect of acupuncture stimulation on plasma levels of LH, FSH, progesterone and esterone and estradiol in normally ovulating women. Four loci, which are known from experience to relate closely to female reproductive organs, were needled with electric stimulation and the responses to synthetic LH-RH with and without acupuncture stimulation were also analyzed in the same cases. Plasma hormone levels were measured by specific radioimmunoassay. All cases showed normal responses to LH-RH corresponding to the day of the menstrual cycle. During the initial part of stimulation, both progesterone and estradiol levels rose in follicular cases and declined in luteal cases. Plasma LH levels declined and FSH showed no change at this time. The analysis of plasma LH responses to LH-RH under acupuncture stimulation revealed extraordinary re-elevation in some cases. It is suggested that properly performed acupuncture stimulation might affect the female endocrine function.

Acupuncture Therapy↗