Biomedical subjects

R Honda

Publications and source records attributed to R Honda.

151 records · Page 9Linked to original sources

PubMedDate not supplied

alpha 1-Microglobulin determination in urine for the early detection of renal tubular dysfunctions caused by exposure to cadmium.

The determination of alpha 1-microglobulin (alpha 1-m) in urine was compared with that of beta 2-microglobulin (beta 2-m) for the detection of renal tubular dysfunctions caused by exposure to cadmium. alpha 1-m In urine is stable down to pH 4.5, whereas beta 2-m degrades below pH 5.5. The relationship between the urinary pH and alpha 1-m or beta 2-m in urine showed that alpha 1-m was independent of urinary pH, whereas beta 2-m-concentration decreased as urinary pH fell to a pH level below 6. Without a pH effect, alpha 1-m was highly correlated with beta 2-m in urine (N = 174, r = 0.96) from Cd-polluted subjects with renal dysfunctions. Due to the greater stability of alpha 1-m in urine, alpha 1-m seemed to be more advantageous than beta 2-m for the detection of renal tubular dysfunctions caused by Cd.

Adult↗

PubMedDate not supplied

Clear cell sarcoma arising in the retroperitoneum.

Clear cell sarcoma is a rare soft-tissue neoplasm, arising most commonly in the tendons and aponeuroses of young adults. We report here the first female case of clear cell sarcoma arising in the retroperitoneum with clinical features similar to those of malignant ovarian tumors. Aspects of clinical presentation, histopathologic evaluation, and treatment are described.

Adult↗

PubMedDate not supplied

Progress of renal dysfunction in inhabitants environmentally exposed to cadmium.

The reversibility of beta 2-microglobulinuria, glucosuria, and aminoaciduria was examined in 74 inhabitants (32 males and 42 females) over 50 yr of age, who lived in a cadmium-polluted area. The subjects participated in two examinations conducted just after the cessation of cadmium exposure and 5 yr later. All urinary parameters did not show reversible changes. During the 5 yr the geometric mean concentrations of beta 2-microglobulinuria, glucosuria, and aminoaciduria indicated significant increases in excretion. In cases where greater than 1,000 micrograms/g creatinine of beta 2-microglobulinuria was observed (at the time cadmium exposure ended), almost all individuals exposed to cadmium showed deterioration of beta 2-microglobulinuria, whereas in the case of less than 1,000 micrograms/g creatinine of beta 2-microglobulinuria, no significant changes were observed. The present study indicates that cadmium-induced renal dysfunction in individuals environmentally exposed to cadmium is irreversible.

Aged↗

PubMedDate not supplied

Long-term observation of serum creatinine and arterial blood pH in persons with cadmium-induced renal dysfunction.

Twenty-one subjects who had cadmium (Cd)-induced renal dysfunction and who lived in a Cd-polluted area in Japan were investigated to determine changes in their renal function. Since 1974, serum creatinine and arterial blood pH were measured annually during the autumn months for 9-14 y. Mean serum creatinine was significantly increased during this period, i.e., from 1.19 +/- 1.28 mg/100 ml to 1.68 +/- 1.56 mg/100 ml. Even after cadmium exposure ceased, significant deterioration of glomerular filtration was found. Eleven subjects showed a greater than 20% serum creatinine increase during this period. The most severe case had a serum creatinine value of 4.4 mg/100 ml at the most recent examination and experienced generalized edema, which suggests a clinical diagnosis of renal failure. The mean arterial blood pH values decreased significantly in all subjects, i.e., from 7.400 +/- 0.023 to 7.361 +/- 0.034. The 11 subjects cited above also showed a significant decrease and progression of tubular dysfunction after Cd exposure ceased. Our findings suggest that Cd-induced renal tubular dysfunction and decreased glomerular filtration are aggravated even after cessation of environmental Cd exposure, and in some cases this renal dysfunction may progress to renal failure.

Acute Kidney Injury↗

PubMedDate not supplied

Serum levels of bone Gla-protein in inhabitants exposed to environmental cadmium.

Serum levels of bone Gla-protein (BGP)--the vitamin K-dependent CA2(+)-binding protein--were evaluated in 76 cadmium (Cd)-exposed subjects with renal tubular dysfunction (32 men, 44 women) and 133 nonexposed subjects (53 men, 80 women). Serum BGP levels were higher in the Cd-exposed subjects than in nonexposed subjects. Significant correlations between BGP and each index measured by bone microdensitometry (MD), serum alkaline phosphatase activity, and Cd in blood and urine were found. For all of the Cd-exposed and nonexposed men and women, BGP showed a significant standard partial regression coefficient (multiple regression analysis) with the metacarpal index (MCI), which was one of the MD indicators. Bone Gla-protein also correlated significantly with urinary beta 2-microglobulin in the men and with serum creatinine in the women. Serum BGP values strongly reflect the degree of bone damage and also reflect, although less strongly, the degree of renal damage induced by exposure to Cd.

Aged↗

PubMedDate not supplied

Significance of urinary cadmium concentration in a Japanese population environmentally exposed to cadmium.

An epidemiological study was performed on 1,815 cadmium-exposed and 240 nonexposed inhabitants of the Kakehashi River basin in Ishikawa, Japan. The significance of urinary cadmium concentration as an indicator of internal dose in a general environment polluted by cadmium was investigated. The mean urinary cadmium concentration (Cd-U) increased in a dose-related manner when the subjects were classified according to the average cadmium concentration in their village rice and according to their period of residence in the polluted area. As total cadmium intake increased, Cd-U also increased, and strong correlations were found (r = .93 in men and r = .88 in women). Therefore, it was concluded that, on a group basis, Cd-U is a useful indicator of the internal dose of environmental cadmium exposure.

Aged↗

PubMedDate not supplied

Dose-response relationship between urinary cadmium concentration and beta2-microglobulinuria using logistic regression analysis.

Logistic regression analysis was used to investigate the dose-response relationship for environmental cadmium exposure and to consider the effect age had on this association. The target population comprised 3178 inhabitants of Japan who were more than 50 y of age and who lived in a cadmium-polluted area and 1134 inhabitants who lived in nonpolluted areas of Japan. Logistic regression analysis was completed on the dose-response relationship between urinary cadmium concentration (i.e., an indicator of cadmium body burden) and beta2-microglobulinuria (i.e., an index of renal tubular dysfunction caused by exposure to cadmium). Both age and urinary cadmium concentration were associated significantly with beta2-microglobulinuria. Based on the relationship that was determined, we calculated, by age and sex, the values of urinary cadmium concentration that corresponded to the prevalence rates of beta2-microglobulinuria in the nonpolluted population. The resulting values were 1.6-3.0 micrograms/g creatinine for men and 2.3-4.6 micrograms/g creatinine for women.

Age Factors↗