Increased stress protein ORP150 autoantibody production in Type 1 diabetic patients.
OBJECTIVE
Various genetic and environmental stresses interfere with protein folding in the endoplasmic reticulum (ER), which leads to the induction of ER stress. It has recently been reported that ER stress is involved in the development of diabetes in diabetic animal models. The aim of this study is to estimate ER stress levels in Type 1 diabetic patients.


METHODS
We recruited Type 1 diabetic patients undergoing periodic follow-up examinations (n = 91) and healthy non-diabetic individuals (n = 37), and measured their serum anti-oxygen-related protein (ORP)150 autoantibody levels.


RESULTS
Anti-ORP150 autoantibody levels in Type 1 diabetic patients were significantly higher compared with those in healthy non-diabetic subjects. Furthermore, the serum autoantibody levels in Type 1 diabetic patients correlated with HbA(1c) (F > 3.0, P = 0.079), indicating that hyperglycaemia itself induces ER stress in diabetes.


CONCLUSIONS
Anti-ORP150 autoantibody levels in Type 1 diabetic patients are higher compared with non-diabetic subjects, suggesting that ER stress is increased in Type 1 diabetes.
Nakatani
Y
Y
Department of Internal Medicine and Therapeutics, Osaka University Graduate School of Medicine, Osaka and Department of Neuroanatomy, Kanazawa University Medical School, Ishikawa, Japan.
Kaneto
H
H
Hatazaki
M
M
Yoshiuchi
K
K
Kawamori
D
D
Sakamoto
K
K
Matsuoka
T
T
Ogawa
S
S
Yamasaki
Y
Y
Matsuhisa
M
M
D000328:Adult; D001323:Autoantibodies / Q000097:blood*; D002908:Chronic Disease; D003922:Diabetes Mellitus, Type 1 / Q000097:blood / Q000276:immunology*; D004721:Endoplasmic Reticulum / Q000276:immunology / Q000502:physiology; D005260:Female; D018840:HSP70 Heat-Shock Proteins; D006801:Humans; D007249:Inflammation / Q000276:immunology; D008297:Male; D018832:Molecular Chaperones / Q000276:immunology; D010100:Oxygen / Q000276:immunology; D011506:Proteins / Q000276:immunology*; D013312:Stress, Physiological / Q000276:immunology
D001323:Autoantibodies; D018840:HSP70 Heat-Shock Proteins; D018832:Molecular Chaperones; D011506:Proteins; C050087:oxygen-regulated proteins; D010100:Oxygen