title: Determination of endogenous levels of retinoic acid isomers in type II diabetes mellitus patients. Possible correlation with HbA1c values.
abstract: A sensitive HPLC method for simultaneous determination of endogenous levels of all-trans-(ATRA), 13-cis-(13cRA), and 9-cis-retinoic acids (9cRA) was applied to serum samples from healthy volunteers and type II diabetes mellitus patients. Levels of 9cRA (around 0.2 ng/ml in both groups) were below the limit of quantification. The concentrations of ATRA and 13cRA were reliably quantified, and the within-day and between-days variances indicated that they were well maintained with little variation. Concentrations of serum ATRA and 13cRA of diabetic patients (ATRA: 1.76 +/- 0.54 ng/ml; 13cRA: 1.77 +/- 0.39ng/ml, n=13) were rather lower than those of healthy subjects (ATRA: 2.08 +/- 0.53 ng/ml; 13cRA: 2.05 +/- 0.26 ng/ml, n = 18), but the differences were not significant, except for the sum of ATRA and 13cRA (p = 0.033). Interestingly, the serum levels of retinoic acids in diabetic patients correlated positively with the hemoglobin A1c (HbA1c) values (ATRA: r = 0.57, p < 0.05; 13cRA: r = 0.62, p < 0.05). The results warrant further studies on the possible involvement of uncontrolled serum retinoic acids levels in the pathogenesis and/or treatment of diabetes mellitus.
authors.affiliation: Graduate School of Pharmaceutical Sciences, The University of Tokyo, Japan.
authors.forename: Yuko
authors.initials: Y
authors.lastname: Yamakoshi
authors.forename: Hiroshi
authors.initials: H
authors.lastname: Fukasawa
authors.forename: Toshimasa
authors.initials: T
authors.lastname: Yamauchi
authors.forename: Hironori
authors.initials: H
authors.lastname: Waki
authors.forename: Takashi
authors.initials: T
authors.lastname: Kadowaki
authors.forename: Koichi
authors.initials: K
authors.lastname: Shudo
authors.forename: Hiroyuki
authors.initials: H
authors.lastname: Kagechi
mesh_terms: D000328:Adult; D000368:Aged; D000704:Analysis of Variance; D003924:Diabetes Mellitus, Type 2 / Q000097:blood*; D006442:Glycated Hemoglobin / Q000032:analysis*; D006801:Humans; D007536:Isomerism; D008875:Middle Aged; D010361:Patients / Q000706:statistics & numerical data; D014212:Tretinoin / Q000097:blood*
chemical_list: D006442:Glycated Hemoglobin; D014212:Tretinoin