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  • Title: Prevalence of metallothioneinuria among the population living in the Kakehashi River basin in Japan--an epidemiological study.
    Author: Shaikh ZA, Kido T, Kito H, Honda R, Nogawa K.
    Journal: Toxicology; 1990 Oct; 64(1):59-69. PubMed ID: 2219133.
    Abstract:
    An epidemiological study to evaluate cadmium-induced renal dysfunction by urinary metallothionein levels was carried out in an environmentally-exposed Japanese population. The study population consisted of 3168 men and women from a cadmium-polluted area who were 50 years and older and 291 individuals from a non-polluted area. The mean metallothionein levels in urine of the control population were 138.2 +/- 2.1 and 198.6 +/- 1.9 microgram/g creatinine for men and women, respectively. The corresponding values for the cadmium-exposed population were 157.8 +/- 2.2 and 248.0 +/- 2.2. The 97.5% upper limits for men in the control population was determined to be 638 and for women 693 microgram MT/g creatinine. Based on these values as the cut-off levels, the prevalence of metallothioneinuria was calculated to be 4.6% in men and 8.4% in women from the cadmium-polluted area. Further selection of the population, based on life-time residence in the polluted area accompanied with the consumption of cadmium-containing rice, showed an even greater prevalence of metallothioneinuria: 5.4% in men and 10.9% in women of all ages. The prevalence of metallothioneinuria increased with age and duration of residence in the polluted area. These results suggest that metallothioneinuria can be used as an indicator of renal dysfunction due to environmental cadmium exposure.
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