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Biomedical subjects

M Hirose

Publications and source records attributed to M Hirose.

At least 685 records · Page 38Linked to original sources
PubMed1978

Popliteal artery entrapment syndrome: a case report.

A rare case of bilateral popliteal artery entrapment syndrome is reported. Pathological changes of the occluded lesion in this anomaly were investigated in 8 other cases. Abnormal longitudinal muscle in the media was noted in all. Development of these muscle bundles was considered to be due to chronic trauma inflicted by pressure on the arterial wall. Its significance is emphasized to assist in differentiation from other chronic arterial occlusive disease.

Adolescent↗
PubMed1978

Changes in chromatin template activity for in vitro transcription during the development of the rat mammary gland.

The template activities of chromatin isolated from virgin, pregnant, lactating, and regressed rat mammary glands were compared by using exogenously added bacterial and mammalian RNA polymerases. Template activity increased during the stage of pregnancy, then decreased during the stage from early lactation to regression. It showed the highest level at early lactation when intracellular levels of rRNA and mRNA are known to be at their maximums. These results suggest that transcriptional activity in the mammary gland is regulated, at least in part, by a modulation of chromatin template activity.

Animals↗
PubMed1978

Induction of preneoplastic hyperplasia and carcinoma by N-methyl-N'-nitro-N-nitrosoguanidine from regenerated mucosa of ulcers induced by iodoacetamide in fundus of rat stomach.

Differences in susceptibility to N-methyl-N'-nitro-N-nitrosoguanidine (MNNG) of fundic mucosa in various states of regeneration after induction of ulcer with iodoacetamide were examined histologically in male Wistar rats. Iodoacetamide was given to rats in their drinking water, before (Group 1), with (Group 2), or after (Group 3) MNNG. Atypical hyperplasia in the renewed mucosa and pyloric gland metaplasia were observed on the ulcers in Group 1 in higher incidence than in Groups 2 and 3. In addition, adenocarcinoma developed in the ulcer of 2 of 17 effective animals in Group 1. These observations suggest that the mucosa showing pyloric gland metaplasia is more susceptible to MNNG than the young rapidly regenerating mucosa at the margin of ulcers.

Adenocarcinoma↗
PubMed1978

Effect of protease inhibitors in mice treated with the hepatocarcinogen, hexachlorocyclohexane (alpha-isomer) and the bladder carcinogen, N-butyl-N-(4-hydroxybutyl)nitrosamine.

Studies were made on the effect of protease inhibitors (pepstatin, leupeptin, and antipain) on the induction of tumors in mice by the alpha-isomer of 1,2,3,4,5,6-hexachlorocyclohexane (alpha-BHC) and by N-butyl-N-(4-hydroxybutyl)nitrosamine (BBN). Animals were given 0.05% alpha-BHC in the diet or 0.05% BBN in their drinking water and then fed on a powder diet supplemented with 0.1% protease inhibitors. The incidence of liver nodular hyperplasias was significantly higher in the group treated with alpha-BHC and leupeptin than in the group treated with alpha-BIC alone, but pepstatin and antipain did not affect induction of liver nodular hyperplasias by alpha-BHC. None of the three protease inhibitors influenced the induction of bladder tumors by BBN.

Animals↗
PubMed1977

Changes in hemodynamics and bradykinin concentration in coronary sinus blood in experimental coronary artery occlusion.

The following parameters were studied before and after acute occlusion of the anterior descending branch of the left coronary artery in 17 dogs: bradykinin (BK) in the coronary sinus blood, heart rate (HR), left ventricular systolic pressure (LVSP), left ventricular end-diastolic pressure (LVEDP), left ventricular max dp/dt (LV max dp/dt), and an index of myocardial contractility (LV max dp/dt/IP). BK levels increased, reaching a maximum of 30 +/- 13 ng/ml 2 min after coronary ligation, accompanied by a significant elevation of LVEDP, and lowering of the myocardial contractility index. HR and LV max dp/dt showed no significant changes. A positive correlation obtained between the level of BK and LVEDP, as well as a negative correlation between the level of BK and of both LVSP and myocardial contractility index. Pretreatment with aprotinine (Trasylol), an inhibitor of kinin forming enzyme, prevented the increase in both BK and LVEDP after coronary artery ligation and caused an elevation of myocardial contractility index. These results suggest that BK formed within ischemic myocardium exerts a negative inotropic action on the heart.

Animals↗