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Elevated serum thioredoxin‐interacting protein in women with polycystic ovary syndrome is associated with insulin resistance
Author(s) -
Wu Jinlin,
Wu Yijia,
Zhang Xuecui,
Li Shu,
Lu Di,
Li Shengbing,
Yang Gangyi,
Liu Dongfang
Publication year - 2014
Publication title -
clinical endocrinology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.055
H-Index - 147
eISSN - 1365-2265
pISSN - 0300-0664
DOI - 10.1111/cen.12192
Subject(s) - txnip , medicine , polycystic ovary , endocrinology , insulin resistance , homeostatic model assessment , insulin , body mass index , biology , thioredoxin , oxidative stress
Summary Objective Women with polycystic ovary syndrome ( PCOS ) mostly have profound insulin resistance ( IR ) and β‐cell dysfunction. Although thioredoxin‐interacting protein ( TXNIP ) is a major regulator in IR and insulin secretion, no data on the plasma TXNIP level in patients with PCOS are available. This study aimed to determine the plasma TXNIP level and discuss the relationship between TXNIP and β‐cell dysfunction/ IR in patients with PCOS . Patients Eighty‐three women with PCOS and 52 controls. Measurements Insulin sensitivity was expressed by M value obtained from euglycaemic–hyperinsulinaemic clamp. Homoeostatic model assessment for β‐cell function ( HOMA ‐β), △Ins 30 /△Glu 30 and AUC ins/glu were considered as the indices of fasting state, early‐phase and total insulin secretion during oral glucose tolerance test, respectively. To evaluate β‐cell function adjusted for insulin sensitivity, disposition index ( DI ) was used: basal DI ( DI 0 ), early‐phase DI ( DI 30 ) and total DI ( DI 120 ). Plasma TXNIP levels were measured by enzyme‐linked immunosorbent assay. Design Case‐control study. Results Patients with PCOS had higher serum TXNIP , whereas lower M value, DI 0 , DI 30 and DI 120 than controls ( P < 0·05); their TXNIP correlated positively with weight , waist‐to‐hip ratio ( WHR ), body mass index ( BMI ), Ins 0 , Ins 120 and HOMA ‐β and correlated negatively with M value and DI 120 ( P < 0·05). Multiple stepwise regression analysis indicated that TXNIP remained associated with M value in PCOS subjects, after adjusting weight , BMI , WHR , HOMA ‐β, Ins 0 , Ins 120 and DI 120 . However, no relationship between TXNIP and impaired β‐cell function was found. Conclusion Serum TXNIP is elevated in women with PCOS and may be a contributing factor for IR .