title: Urinary levels of tissue kallikrein in black and Indian hypertensives and their implications for therapy.
abstract: It is accepted that blacks differ from white and Indian hypertensives in their response to hypotensive agents. Black hypertensives in the USA have lower urinary tissue kallikrein (TK) excretion levels than white hypertensives. It has been suggested that blacks respond better to thiazide diuretics than to beta-blockers because thiazides increase TK excretion whereas beta-blockers decrease it. This study compares the excretion of urinary TK in black and Indian hypertensive and normotensive subjects. Urinary TK levels were measured with the selective, synthetic peptic substrate with the sequence of H-D-Val-Leu-Arg-pNA. Ten hypertensive patients on placebo therapy and 10 normotensive black and Indian subjects provided 3 samples at weeks 0, 2 and 4 for the determination of urinary TK. The results were analysed and analysis of variance was used to compare the two racial groups. There were no significant differences in urinary TK values of the three biweekly individual samples. Urinary TK values (ng TK/microgram protein) in Indian hypertensives were generally lower than in black hypertensives.
authors.affiliation: Department of Medicine, University of Natal, Durban.
authors.forename: Y K
authors.initials: YK
authors.lastname: Seedat
authors.forename: K D
authors.initials: KD
authors.lastname: Bhoola
authors.forename: R
authors.initials: R
authors.lastname: Muller
authors.forename: I G
authors.initials: IG
authors.lastname: Randeree
authors.forename: D
authors.initials: D
authors.lastname: Pillay
mesh_terms: D000328:Adult; D000704:Analysis of Variance; D044383:Black People; D001794:Blood Pressure; D004573:Electrolytes / Q000652:urine; D005260:Female; D006801:Humans; D006973:Hypertension / Q000208:ethnology* / Q000652:urine*; D007194:India / Q000208:ethnology; D007610:Kallikreins / Q000652:urine*; D008297:Male; D008875:Middle Aged; D018709:Statistics, Nonparametric; D013997:Time Factors; D044465:White People
chemical_list: D004573:Electrolytes; D007610:Kallikreins