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Long-term sustained autoimmune response to beta cell specific zinc transporter (ZnT8, W, R, Q) in young adult patients with preserved beta cell function at diagnosis of diabetes.

Ingemansson, Sofie LU ; Vaziri Sani, Fariba LU ; Lindblad, Ulf LU ; Gudbjornsdottir, Soffia and Törn, Carina LU (2012) In Autoimmunity
Abstract
The aim of this study was to examine whether autoantibodies to: ZnT8-Tryptophan (ZnT8WA), ZnT8-Arginine (ZnT8RA) or ZnT8-Glutamine (ZnT8QA) correlated with C-peptide or other autoantibodies and to assess diagnostic sensitivity of ZnT8WRQA. Specimens from 270 newly diagnosed diabetic subjects (age 15--34 years) and after five 5 years duration of disease were examined. Four linear regression models were used to dissect the importance of different factors from diagnosis for the respective difference of (logZnT8WA), (logZnT8RA) and (logZnT8QA); A) unadjusted model for: initial C-peptide, age, BMI, gender, clinical classification, ICA, GADA, IA-2A, (ZnT8WA/ZnT8RA/ZnT8QA); B) C-peptide corrected for clinical factors; C) C-peptide corrected for... (More)
The aim of this study was to examine whether autoantibodies to: ZnT8-Tryptophan (ZnT8WA), ZnT8-Arginine (ZnT8RA) or ZnT8-Glutamine (ZnT8QA) correlated with C-peptide or other autoantibodies and to assess diagnostic sensitivity of ZnT8WRQA. Specimens from 270 newly diagnosed diabetic subjects (age 15--34 years) and after five 5 years duration of disease were examined. Four linear regression models were used to dissect the importance of different factors from diagnosis for the respective difference of (logZnT8WA), (logZnT8RA) and (logZnT8QA); A) unadjusted model for: initial C-peptide, age, BMI, gender, clinical classification, ICA, GADA, IA-2A, (ZnT8WA/ZnT8RA/ZnT8QA); B) C-peptide corrected for clinical factors; C) C-peptide corrected for autoantibodies; D) C-peptide corrected for all factors. The least decrease of ZnT8WA was observed in patients with high initial C-peptide in all models A) p = 0.054; B) p = 0.021; C) p = 0.047 and D) p = 0.017. A less statistically significant decrease of ZnT8RA was observed in patients with high initial C-peptide in A) p = 0.038 and C) p = 0.047, but this finding was not confirmed in B or D. The decrease of ZnT8QA levels was not related to C-peptide in any model but correlated to age D) p = 0.049. Furthermore, patients with unclassifiable diabetes showed the least decrease in D) p = 0.035. ZnT8WA, ZnT8RA or ZnT8QA were identified as a single autoantibody in 3.8% (10/266) of patients, thereby increasing diagnostic sensitivity from 79.3% (211/266) to 83.1% (221/266). In conclusion, high initial C-peptide was the most important factor even after adjusting for other factors in patients positive for ZnT8WA or ZnT8RA to remain autoantibody positive five 5 years after diagnosis. (Less)
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Contribution to journal
publication status
published
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in
Autoimmunity
publisher
Taylor & Francis
external identifiers
  • wos:000313589000008
  • pmid:23039265
  • scopus:84872192723
ISSN
0891-6934
DOI
10.3109/08916934.2012.730585
language
English
LU publication?
yes
id
7204f4c1-b620-4053-a700-6f3b04ec083e (old id 3161066)
alternative location
http://www.ncbi.nlm.nih.gov/pubmed/23039265?dopt=Abstract
date added to LUP
2012-11-01 13:43:12
date last changed
2017-01-01 07:43:35
@article{7204f4c1-b620-4053-a700-6f3b04ec083e,
  abstract     = {The aim of this study was to examine whether autoantibodies to: ZnT8-Tryptophan (ZnT8WA), ZnT8-Arginine (ZnT8RA) or ZnT8-Glutamine (ZnT8QA) correlated with C-peptide or other autoantibodies and to assess diagnostic sensitivity of ZnT8WRQA. Specimens from 270 newly diagnosed diabetic subjects (age 15--34 years) and after five 5 years duration of disease were examined. Four linear regression models were used to dissect the importance of different factors from diagnosis for the respective difference of (logZnT8WA), (logZnT8RA) and (logZnT8QA); A) unadjusted model for: initial C-peptide, age, BMI, gender, clinical classification, ICA, GADA, IA-2A, (ZnT8WA/ZnT8RA/ZnT8QA); B) C-peptide corrected for clinical factors; C) C-peptide corrected for autoantibodies; D) C-peptide corrected for all factors. The least decrease of ZnT8WA was observed in patients with high initial C-peptide in all models A) p = 0.054; B) p = 0.021; C) p = 0.047 and D) p = 0.017. A less statistically significant decrease of ZnT8RA was observed in patients with high initial C-peptide in A) p = 0.038 and C) p = 0.047, but this finding was not confirmed in B or D. The decrease of ZnT8QA levels was not related to C-peptide in any model but correlated to age D) p = 0.049. Furthermore, patients with unclassifiable diabetes showed the least decrease in D) p = 0.035. ZnT8WA, ZnT8RA or ZnT8QA were identified as a single autoantibody in 3.8% (10/266) of patients, thereby increasing diagnostic sensitivity from 79.3% (211/266) to 83.1% (221/266). In conclusion, high initial C-peptide was the most important factor even after adjusting for other factors in patients positive for ZnT8WA or ZnT8RA to remain autoantibody positive five 5 years after diagnosis.},
  author       = {Ingemansson, Sofie and Vaziri Sani, Fariba and Lindblad, Ulf and Gudbjornsdottir, Soffia and Törn, Carina},
  issn         = {0891-6934},
  language     = {eng},
  month        = {10},
  publisher    = {Taylor & Francis},
  series       = {Autoimmunity},
  title        = {Long-term sustained autoimmune response to beta cell specific zinc transporter (ZnT8, W, R, Q) in young adult patients with preserved beta cell function at diagnosis of diabetes.},
  url          = {http://dx.doi.org/10.3109/08916934.2012.730585},
  year         = {2012},
}