[Study on the postive frequency and distribution of glutamic acid decarboxylase antibody in phenotypic type 2 diabetec patients].
OBJECTIVE
To investigate the positive frequency and distribution of glutamic acid decarboxylase antibody(GAD-Ab) in phenotypic type 2 diabetic(T2DM) patients.


METHODS
Sera of 2035 phenotypic T2DM patients were screened for GAD-Ab with radioligand assay. The positive frequency of GAD-Ab and its relation with clinical features were analyzed.


RESULTS
(1) The positivity of GAD-Ab in clinic-based, phenotypic T2DM patients was 7.1% (145/2035), comparable to that of data from Caucasians as shown by UKPDS(8.7% vs. 9.8%, P = 0.391) and ADOPT (8.0% vs. 4.2%, P = 0.000) but higher than that of Japanese in Ehime study(7.1% vs. 3.8%, P = 0.000). (2) The positive frequency and distribution of GAD-Ab titer were related to clinical features, including age at onset, body mass index (BMI) and fasting C peptide levels. Patients with younger age at onset (0.33 vs. 0.11, P < 0.05), less BMI (0.34 vs. 0.10, P < 0.05) and lower C peptide levels (0.38 vs. 0.11, P < 0.05) would have higher GAD-Ab titers.


CONCLUSIONS
(1)The positivity of GAD-Ab in adult-onset phenotypic T2DM in Chinese was similar to that of Caucasians but higher than that of the Japanese. (2) The distribution of GAD-Ab titers was associated with clinical features, with high GAD-Ab titers for those having younger age at onset, less BMI and lower C peptide levels.
Li
Xia
X
Diabetes Centre, Institute of Metabolism and Endocrinology, Xiangya Second Hospital, Central South University, Changsha 410011, China.
Zhou
Zhi-guang
ZG
Haung
Gan
G
Peng
Jian
J
Yan
Xiang
X
Yang
Lin
L
Wang
Jian-ping
JP
Deng
Zhi-ming
ZM
D000293:Adolescent; D000328:Adult; D017668:Age of Onset; D000368:Aged; D000369:Aged, 80 and over; D000906:Antibodies / Q000276:immunology* / Q000378:metabolism*; D015992:Body Mass Index; D016022:Case-Control Studies; D002648:Child; D002675:Child, Preschool; D003924:Diabetes Mellitus, Type 2 / Q000175:diagnosis / Q000378:metabolism* / Q000473:pathology / Q000503:physiopathology; D005260:Female; D005968:Glutamate Decarboxylase / Q000276:immunology*; D006801:Humans; D007223:Infant; D008297:Male; D008875:Middle Aged; D010641:Phenotype; D055815:Young Adult
D000906:Antibodies; D005968:Glutamate Decarboxylase