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Erythrocyte Membrane Ion Transport in Offspring of Hypertensive Parents
Author(s) -
SUCHÁNKOVÁ GABRIELA,
VLASÁKOVÁ ZUZANA,
ZICHA JOSEF,
VOKURKOVÁ MARTINA,
DOBEŠOVÁ ZDENA,
PELIKÁNOVÁ TEREZIE
Publication year - 2002
Publication title -
annals of the new york academy of sciences
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.712
H-Index - 248
eISSN - 1749-6632
pISSN - 0077-8923
DOI - 10.1111/j.1749-6632.2002.tb04291.x
Subject(s) - hyperinsulinemia , medicine , endocrinology , insulin resistance , insulin , chemistry , red blood cell , glucose transporter , ion transporter , pancreatic hormone , hyperinsulinism , biochemistry , membrane
A bstract : Some patients with essential hypertension exhibit insulin resistance (IR) and several red blood cell (RBC) ion transport abnormalities. The aims of the study were to assess RBC ion transport acitivities under basal conditions, to test in vivo the effect of acute hyperinsulinemia, and to evaluate the relationship to IR in the offspring of hypertensive parents ( n = 12 ; OHP) and healthy controls ( n = 14 ; C). Activities of the Na + ‐K + pump, Na + ‐K + cotransport, Na + ‐Li + countertransport (SLC), and Na + , Rb + , and Li + leaks (passive membrane permeability) were measured before and after a hyperinsulinemic (75 μU/mL) euglycemic clamp (HIC) and compared to those found under isoinsulinemic isovolumic conditions in OHP and C. An insulin action was calculated as glucose disposal and insulin sensitivity index (M/I) after HIC. OHP were characterized by lower M/I (0.12±0.07 vs. 0.20±0.09 mg/kg/min/μU/mL; p < 0.05 ) and elevated SLC and Li + and Rb + leaks ( p < 0.05 ) compared with C. Although acute hyperinsulinemia did not modify significantly any ion transport parameter studied, negative correlation was observed between insulin action and membrane cation leaks. Glucose disposal correlated with an Li + leak in C ( r =−0.736; p < 0.01 ) and all subjects ( r =−0.424; p < 0.05 ) after HIC and in OHP with an Na + leak ( r =−0.727; p < 0.05 ) before HIC. In conclusion, OHP displayed higher insulin resistance, enhanced activity of SLC, and augmented Li + and Rb + leaks. Acute hyperinsulinemia did not modify any ion transport parameter studied, although negative correlation was observed between insulin action and membrane leaks.