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Biomedical subjects

S Yoshimura

Publications and source records attributed to S Yoshimura.

At least 109 records · Page 6Linked to original sources
PubMed1987

[Superovulation-induced transient hyperprolactinemia in human in vitro fertilization and embryo transfer].

To examine the effects of transient hyperprolactinemia on in vitro fertilization and embryo transfer, 61 cycles in 50 euprolactinemic ovulatory women with irreparable tubal diseases were stimulated with clomiphene (CC) alone or CC and human menopausal gonadotropin followed by human chorionic gonadotropin (hCG). Serum prolactin (PRL) increased after hCG administration with peak values of 45.4 +/- 4.2 ng/ml on the day of laparoscopic oocyte aspiration. The highest serum estradiol (E2) concentration was found on the day before PRL peak and serum progesterone (P) began to increase after hCG injection concomitant with the PRL rise. The group having 50 ng/ml or more of PRL (34 cycles) had significantly higher levels of E2 during preovulatory and early luteal phase compared to those of the group having less than 50 ng/ml of PRL (27 cycles) but there was no significant difference between the P levels in the two groups. In the higher PRL group 72 (62.1%) of 116 collected oocytes were fertilized and 6 (20.0%) conceived. In the lower PRL group 45 oocytes (58.4%) of 77 were fertilized and 3 (12.5%) became pregnant. These data suggest that elevated serum PRL concentrations may have no effect on fertilization of oocytes in vitro or embryonic development.

Adult↗
PubMed1986

Effects of decalcification on immunoperoxidase staining.

One of the limitations of immunoperoxidase methods applied in surgical pathology is the loss of immunoreactivity during fixation and processing. In this study, the effects of decalcification on the immunoreactivity of various antigens in formalin fixed tissues were examined. The pieces of fixed tissue were placed in four different decalcifying solutions (EDTA, formic acid, nitric acid, and Plank-Rychlo solution) for various time periods and then processed routinely and embedded in paraffin. The paraffin sections of the tissues were stained with immunoperoxidase methods for immunoglobulins, hormones, or tissue/tumor-specific markers. Sections of nondecalcified tissues were used as a control. The immunohistochemical staining intensity and the number of positive cells were not reduced significantly in decalcified tissues within the usual time period of routine decalcification procedures. Many antigens survived even prolonged decalcification. The results of this study indicate that routinely decalcified tissues can be used for immunoperoxidase staining without significant loss of immunoreactivity.

Decalcification Technique↗
PubMed1986

Immunocytochemical study of glutathione peroxidase in normal rat kidney.

In the normal rat kidney, immunohistochemical localization of glutathione peroxidase (GSH-Po) was mainly in the proximal tubules (PTs), where the proximal portions (S1 + S2) were more intensely stained than the distal portion (S3). Immunocytochemically, GSH-Po was localized in cytosol including the core of microvilli and lysosomes of the epithelial cells in the PTs. Since albumin and IgG were not found in cytosol, it is suggested that cytosolic GSH-Po may be generated in situ, but is not derived from the serum.

Albumins↗
PubMed1986

Effects of four antiarrhythmic drugs on the induction and termination of paroxysmal supraventricular tachycardia.

The electrophysiological effects of antiarrhythmic drugs were tested in 36 patients with recurrent paroxysmal supraventricular tachycardia (PSVT), 25 of whom had accessory pathway reentrant tachycardia (APRT) and 11 A-V nodal reentrant tachycardia (AVNRT; 10 of the slow-fast type one of the fast-slow type). The test drugs were procainamide (used in 19 patients), verapamil (in 27), disopyramide (in 31), and propranolol (in 15). The drugs were tested for their ability to terminate episodes of PSVT as well as to inhibit their induction. Procainamide had an inhibitory effect on APRT in nine of 12 patients (75%) and terminated episodes of APRT in seven of 11 patients (63.6%); in all of them V-A block was responsible for the termination. In four of six patients (66.7%) with slow-fast AVNRT and in one patient with fast-slow AVNRT, inhibition of the induction of tachycardia attacks was noted after procainamide. Termination of AVNRT was seen in the same number of patients. Verapamil inhibited the induction of APRT in 12 of 18 patients (66.7%) and terminated episodes of APRT in 10 of 16 patients (62.5%), all by A-V block. In six of eight patients (75%) with slow-fast AVNRT, inhibition of the induction as well as termination of tachycardia were noted after verapamil. Disopyramide had an inhibitory effect on APRT in seven of 23 patients (30.4%) and terminated APRT in five of 21 patients (23.8%) by V-A block, while AVNRT (all slow-fast type) was terminated in only one of eight patients (12.5%) by disopyramide. Disopyramide was less effective than previously reported. This could be attributed to a relatively low dosage and slow infusion speed. Propranolol inhibited the induction of APRT and terminated episodes of APRT in only one of 10 patients (10%). In two of four patients (50%) with slow-fast AVNRT, an inhibitory effect by propranolol was noted, but termination was seen in only one patients.

Adolescent↗
PubMed1986

Immunohistological study with peroxidase-antiperoxidase staining in a case of generalized prepubertal periodontitis.

A case of prepubertal periodontitis was observed and examined immunohistologically with peroxidase-antiperoxidase staining. The patient was an 11-year and 7-month-old Japanese girl, well-developed and well-nourished. Her parents were first cousins. Her chief complaint was the loosening and loss of the permanent teeth. There was a similar history of primary dentition. Her remaining permanent teeth were loosened with severe alveolar bone loss, but calculus deposit was minimal. Significantly, there was no palmar-plantar hyperkeratosis. General examination showed normal data except for the increase of the immunoglobulin concentrations. In neutrophil function tests chemotaxis was depressed, although phagocytosis, random migration and superoxide production were within normal limits. Histologically, neutrophils were seen in the gingival tissue and other findings were also similar to those of adult periodontitis. In immunohistological examination, IgG-bearing cells which mostly consisted of plasma cells predominated in the lesion. Considering the past history, the immunodeficiency and the absence of palmar-plantar hyperkeratosis, the case was diagnosed as prepubertal periodontitis.

Aggressive Periodontitis↗
PubMed1986

[Cardiac function noninvasively evaluated by phasic pattern analysis of ventricular power during ejection].

To evaluate cardiac function, ventricular power during ejection (power) and the rate of change of power (dPower/dt) were assessed noninvasively. Power was determined from the product of aortic flow (Fa(t] and brachial arterial pressure (Pa(t]. Fa(t) was measured at the suprasternal notch using an ultrasonic pulsed Doppler flowmeter with a 2 MHz carrier frequency and 10 KHz repetition frequency. The maximum detectable blood velocity was 380 cm/sec. Pa(t) was measured using a newly-developed method based on indirect unloading techniques and an air pressure system. There were 21 normal subjects and seven patients with coronary artery disease in this study. The following results were obtained. There was no significant difference between power patterns calculated by Pa(t) and Pao(t) (aortic pressure measured by catheter). The average peak dPower/dt was 160.2 J/sec2 in normal subjects, 145.2 L/sec2 in patients with ejection fractions greater than 50%, and 93.5 J/sec2 in patients with ejection fraction less than 50%. Peak dPower/dt was significantly decreased in patients with the lower ejection fraction (p less than 0.005). The results indicated that this index is clinically useful in evaluating cardiac contractility.

Adult↗
PubMed1985

Isolation, primary structure and synthesis of heat-stable enterotoxin produced by Yersinia enterocolitica.

Five heat-stable enterotoxins were isolated from the culture supernatant of Yersinia enterocolitica and purified to homogeneity by DEAE-Sephacel and high-performance liquid chromatographies. They caused acute fluid accumulation in the intestine of suckling mice. The amino acid sequence of one of the enterotoxins was determined to be Ser-Ser-Asp-Trp-Asp-Cys-Cys-Asp-Val-Cys-Cys-Asn-Pro-Ala-Cys-Ala-Gly-Cys, by Edman degradation of its pyridylethylated derivative and a combination of fast atom bombardment mass spectrometry and carboxypeptidase B digestion. This structure was unambiguously confirmed by chemical synthesis. The other enterotoxins had longer or shorter amino acid sequences at their N termini, but the same sequence at their C termini. The six half-cystine residues formed intramolecular disulfide linkages, as shown by measurement of the molecular masses of the enterotoxins by fast atom bombardment mass spectrometry. The sequence of 13 amino acid residues at the C terminus showed similarity to those of heat-stable enterotoxins isolated from enterotoxigenic Escherichia coli [Aimoto, S. et al. (1982) Eur. J. Biochem. 129, 257-263; Takao, T. et al. (1983) FEBS Lett. 152, 1-5] suggesting that these similar sequences are related to the common biological and immunological properties of enterotoxins produced by Y. enterocolitica and enterotoxigenic E. coli.

Amino Acid Sequence↗
PubMed1985

Essential structure for full enterotoxigenic activity of heat-stable enterotoxin produced by enterotoxigenic Escherichia coli.

Several analogues of heat-stable enterotoxins (STh and STp) produced by enterotoxigenic Escherichia coli were synthesized. Peptides (STh[6-18] and STp[5-17]) consisting of 13 amino acid residues from the Cys residue near the N-terminus to the Cys residue near the C-terminus and linked by three disulfide bonds had the same biological and immunological properties as native STh and STp, respectively. The results indicated that the sequence with the 13 amino acid residues and three disulfide linkages is essential for full biological activity of ST.

Amino Acid Sequence↗
PubMed1985

Plasma levels of 13,14-dihydro-15-keto prostaglandin F2 alpha, estrogens, and progesterone during stretch-induced labor at term.

The uterus of six healthy multiparous women at term was mechanically stretched by a rubber catheter and balloon. Apparent labor was inaugurated in all cases within 5 hours and increased progressively with time. Advanced cervical softening and dilatation were also evident after the stretch treatment. Significant increases in the levels of 13,14-dihydro-15-keto-prostaglandin F2 alpha (PGFM) were observed with the progress of treatment (P less than 0.01). Plasma estrogens and progesterone levels did not change significantly during the treatment (P greater than 0.05). Stretching and/or resulting uterine contractions appear to induce the secretion of prostaglandin F2 alpha (PGF) from the organ, which in turn seems to be involved in both cervical softening, and the onset and progress of labor, under stable conditions of plasma estrogens and progesterone.

Adult↗
PubMed1985

The third (C3) and fourth (C4) components of complement in human liver. Immunocytochemical evidence for hepatocytes as the site of synthesis.

We localized the third (C3) and fourth (C4) components of complement by light and electron microscopic immunocytochemistry in liver biopsy specimens from patients without overt liver disease or with chronic hepatitis. In both groups it was found that almost all hepatocytes contained the two complement proteins in protein-generating organelles, i.e., the perinuclear spaces, cisternae of the rough endoplasmic reticulum, Golgi apparatus, and cytoplasmic transport vesicles. In addition, the sinusoidal membrane and vesicles that appeared to be fused with the membrane were positive for C3 and C4. The complement proteins were absent from the protein-synthesizing apparatus of other kinds of cells, but they were present in phagosomes of Kupffer cells. We conclude that hepatocytes but not other cells in the human liver synthesize C3 and C4. In addition, a plausible pathway for transport of the complement proteins from hepatocytes into the blood circulation was identified.

Complement C3↗