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Children with type 1 diabetes of early age at onset – immune and metabolic phenotypes

  • Madalena Sales Luis ORCID logo , Margarida Alcafache , Sara Ferreira , Ana Laura Fitas , Joana Simões Pereira ORCID logo , Íris Caramalho , Lurdes Lopes and Catarina Limbert EMAIL logo
Published/Copyright: July 6, 2019

Abstract

Objectives

We aimed to evaluate children with type 1 diabetes (T1D) with early age at onset (EAO) for clinical, immune and metabolic features in order to identify age-related disease phenotypes.

Methods

Comparative study of two groups of T1D children: EAO (≤5 years) and later age at onset (LAO; >5 years), regarding the presence of other autoimmune (AI) diseases, diabetes ketoacidosis and immunologic profile at onset and metabolic data 1 year after diagnosis. Statistical analysis was performed with significance set for p < 0.05.

Results

The study included 137 children (EAO = 52, mean age 3.6 ± 1.5 [mean ± standard deviation (SD)] and LAO = 85, mean age 10.4 ± 2.9). EAO was more associated with concomitant AI diseases (p = 0.032). Despite no differences in disease onset, EAO presented with lower C-peptide levels (p = 0.01) and higher absolute lymphocyte number (p < 0.0001), with an inverse correlation between these two variables (p = 0.028). Additionally, the EAO group had a higher frequency of serum detection of three antibodies (Abs) (p = 0.0008), specifically insulin Abs (p = 0.0001). One year after diagnosis, EAO had higher total daily insulin (TDI) dose (p = 0.008), despite similar hemoglobin A1c (HbA1c).

Conclusions

Our data show an association of EAO T1D with more AI diseases, higher number of Abs, lower initial insulin reservoir and higher insulin requirements 1 year after diagnosis. In this group, immune imbalance seems more evident and disease progression faster, probably reflecting distinct “immune environment” with different ages at disease onset. Further studies in the field of immunogenetics and immune tolerance are required, to improve patient stratification and find novel targets for therapeutic intervention.


Corresponding author: Catarina Limbert, MD, PhD, Paediatric Endocrinology and Diabetology Unit, Hospital de Dona Estefânia, Centro Hospitalar de Lisboa Central, Rua Jacinta Marto, 1169-045 Lisbon, Portugal, Phone: 00 351 213 596 540, Fax: 00 351 213 126 667

  1. Author contributions: MSL was responsible for data collection and wrote the manuscript. MA collected the data, performed statistical analysis and revised the manuscript. SF collected the data and revised the manuscript. ALF was enrolled in patient recruitment and revised the manuscript. JSP initiated data collection and revised the manuscript. IC and LL revised the manuscript. CL initiated and supervised the project, co-wrote the manuscript and is the guarantor of this work. All authors discussed the results and approved the final version of the manuscript.

  2. Conflict of interest: Nothing to declare.

  3. Research funding: Nothing to declare.

  4. Employment or leadership: Nothing to declare.

  5. Honorarium: Nothing to declare.

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Received: 2019-02-24
Accepted: 2019-05-27
Published Online: 2019-07-06
Published in Print: 2019-09-25

© 2019 Walter de Gruyter GmbH, Berlin/Boston

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