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Biomedical subjects

K Hoshi

Publications and source records attributed to K Hoshi.

At least 325 records · Page 18Linked to original sources
PubMed1980

Enzyme-linked immunosorbent assay for measuring serum IgE.

Serum IgE was measured by a sandwich method using polystyrene beads coated with anti-IgE gamma-globulin and peroxidase labelled anti-IgE gamma-globulin. The method was simple, and as sensitive as the radioimmunoassay.

Enzyme-Linked Immunosorbent Assay↗
PubMed1980

Effects of alpha blockers on blood pressure and on the Ca-contracture of cat aortic strips.

To further clarify the hypotensive mechanism of adrenergic alpha blockers, effects of several alpha blockers on systemic blood pressure and on Ca-contracture of isolated, cat aortic strips were studied. For this purpose, the effects of known adrenergic alpha blockers, phentolamine, phenoxybenzamine, and a newly synthesized adrenergic alpha blocker (2-(N-(n-Butyloyl)homopiperazine-N'-yl)-4-amino-6,7-dimethoxy quinazoline; E-643) were compared with those of nitroglycerin and verapamil. Systemic blood pressure was decreased by administration (2 x 10(-8) moles/kg i.v.) of all drugs except phenoxybenzamine. The order of maximal fall of diastolic blood pressure after the injection was; nitroglycerin greater than E-643 greater than phentolamine greater than verapamil greater than phenoxybenzamine. Although "adrenaline reversal" was observed after 2 x 10(-7) moles/kg of phenoxybenzamine, i.e. a 10-fold increase in the dose of phenoxybenzamine, there was no decrease in systemic blood pressure with this dose. All these drugs in a concentration of 2 x 10(-6) M inhibited the Ca-contracture (phasic and tonic) of the depolarized aortic strips. The order of inhibition of phasic and tonic contracture was: nitroglycerin greater than E-643, verapamil greater than phentolamine greater than phenoxybenzamine. The pA2 values for phentolamine and E-643 in antagonizing contractions produced by noradrenaline of cat aortic strips were 7.8 and 8.2, respectively. Hypotensive effects of these drugs (except phenoxybenzamine), parallel the inhibitory effects on the Ca-contracture of the aortic strips. These results suggest that alpha blockers such as phentolamine and E-643 exert a systemic hypotensive effect not through their alpha blocking action but by an inhibitory action on the contractile Ca-mechanism.

Adrenergic alpha-Antagonists↗
PubMed1979

Cellular changes in severe dysplasia of the uterine cervix progressing to malignancy.

Of a total of 1321 cases of severe dysplasia of the uterine cervix, 237 lesions (18%) were found by punch biopsy and cytological examination to have progressed to carcinoma in situ or microinvasive carcinoma later in the course of follow-up. The changes in exfoliated cells during the progression to malignancy were examined in 95 of the 237 cases. Results obtained were as follows: (1) The ratio of parabasal (immature) cells to the whole dysplastic cells gradually increased in each specimen. (2) Immature dysplastic cells showing increased nuclear membrane tension and irregular staining of the nuclear membrane gradually increased. (3) The number of immature dysplastic cells with finely or coarsely granular chromatin patterns gradually increased.

Adult↗
PubMed1979

Fluorescence microscopic and enzyme histochemical studies of the innervation of the human spleen.

The innervation of the human spleen was investigated by the fluorescence method for adrenergic nerve fibers (52 cases) and the enzyme histochemical method for cholinergic nerve fibers (27 cases). The spleens examined were removed by laparotomy chiefly for gastric cancer. Adrenergic nerve fibers were demonstrated at the medioadventitial junction and the media in the trabecular arteries, whereas they occurred at the medioadventitial junction in the central and penicillar arteries. They were not found in the trabecular and pulp veins and venules, sheathed capillaries, avascular trabeculae, white and red pulp, and capsule. Nerves containing only a few adrenergic fibers and nerves without adrenergic fibers occurred close to the trabecular arteries. It was also demonstrated that nerves close to the trabecular arteries contain cholinergic fibers. The present study first verifies histochemically that the human spleen is innervated doubly by adrenergic and cholinergic nerve fibers.

Adrenergic Fibers↗