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Biomedical subjects

Y Maseki

Publications and source records attributed to Y Maseki.

8 recordsLinked to original sources
PubMed1990

[A case report of corrected transposition of the great arteries without any associated defects in a 36-year-old man and the review of adult cases reported in Japan].

We report a case in a 36-year-old man of corrected transposion of the great arteries (CTGA) without any associated defects. We also review clinical characteristics and later complications of adult CTGA cases reported in Japan. The patients was referred to our hospital for further examination of the abnormal ECG found during regular medical check-up. His ECG showed left axis deviation, first degree AV block, abnormal Q waves in the left precordial leads, and disappearance of septal q waves in the left precordial leads. His exercise capacity was found to be more than 12 METS by treadmill exercise testing. His roentgenogram revealed an egg-shaped ventricle with normal CTR (45%). The following findings were obtained by two-dimensional echocardiogram and heart catheterization: 1) the functional left ventricle had the characteristics of the anatomical right ventricle, 2) The positions of the left and right atrioventricular valves were reversed, 3) Other cardiac anomalies such as VSD, pulmonary stenosis, tricuspid regurgitation (TR) were not proved. Therefore, he was diagnosed as having CTGA without any cardiac defects (SLL type). At present, with ages more than 15 years, 36 cases of CTGA without cardiac anomalies have been reported in Japan including this case. But most cases had significant TR. This case was the 7th reported case without the accompaniment of TR. Among 36 cases, TR was found in 71%, complete AV block in 20%, and congestive heart failure was noted in 45%. Prognosis of CTGA without any defects is dependent on the appearance of TR, advanced AV block, and congestive heart failure. As these later fatal complications are observed very often, it is important to detect the patient of CTGA accurately.(ABSTRACT TRUNCATED AT 250 WORDS)

Adult↗
PubMed1983

[Studies on the pathogenesis of idiopathic male infertility by testicular biopsy].

We have been studying the cause of idiopathic male infertility by means of testicular biopsy, and already have made several reports. This is a summary of these reports and a presentation of our concept for hypothetic pathogenesis of idiopathic infertile testes. Testicular biopsies were performed by Charny's accepted technique and tissues examined by light microscopic, histochemical, and transmission and scanning electron microscopic procedures. Also the circulatory sexual hormones; follicle stimulating hormone, luteinizing hormone, and testosterone of all patients were measured. The primary pathogenetic changes occur in the seminiferous tubular walls which are thickened by increase in immature collagen fibers and lamellation of seminiferous basement membrane, and they are followed by increase of follicle stimulating hormone. These seminiferous tubular changes occur discontinuously, so the idiopathic infertile seminiferous tubules resemble a rope strangulated in various places, or a tail-like rope gradually becoming thinner. Also, activated mast cells increase around the strangulated places. Thus, spermatogenesis in strangulated tubular parts decreases because of the nutritional disturbance caused by thickened tubular walls, and the strangulation of tubules interferes with the travel of sperms in the seminiferous tubules by interrupted seminiferous tubular peristalsis. Sloughing or disorganization in the infertile seminiferous tubules can be observed. In the infertile testes, Leydig cells generally increase with the elevation in the level of luteinizing hormone, but serum testosterone does not increase. And this normal value of serum testosterone is statistically found to be caused by the degradation in the quality of Leydig cells in idiopathic infertile testes. Also, galactose deficiency in glycoproteins of idiopathic infertile testicular tissue is reported.

Adult↗
PubMed1981

A dual staining method for neutral complex carbohydrates using alkaline phosphatase-labeled concanavalin A and periodic acid-Schiff.

A method has been developed for the dual staining of neutral complex carbohydrates in light microscopy. It combines an alkaline phosphatase-labeled concanavalin A-5-bromo-3-indolyl phosphate, p-toluidine salt (Con A-ALP-BIPT) method with periodic acid-Schiff (PAS) sequence. With the present dual staining method, it is possible to color alpha-D-glucosyl and alpha-D-mannosyl residues blue and 1,2-glycol groups of neutral complex carbohydrates magenta. The validity of this method has been confirmed with appropriate histochemical controls and enzyme digestions on test tissues.

Alkaline Phosphatase↗
PubMed1979

The histochemistry of complex carbohydrates in the testes of patients of idiopathic male infertility.

In testis tissues from patients with idiopathic male infertility, complex carbohydrates have been studied by means of light microscopic histochemical methods, comparisons being made with the normal testes. In the infertile testes, histochemical reactions for acidic and neutral complex carbohydrates were in general weaker in intensity than in the normal testes. In the seminiferous tubules and interstitium of the infertile testes, a histochemical finding of primary importance was obtained with the demonstration of galactose deficiency in the complex carbohydrates involved. These glycoproteins contained only small numbers of sulfhydryl and disulfide groups. The possible histophysiological significance of these complex carbohydrates is discussed, with special reference to their histochemical properties determined in the present study.

Carbohydrates↗