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Updated: Oct 28, 2025
Methods to Assess Beta Cell Death Mediated by Cytotoxic T Lymphocytes
Published on: June 16, 2011
Complete blood counts with red blood cell determinants associate with reduced beta-cell function in seroconverted
Falastin Salami1, Roy N Tamura2, Helena Elding Larsson1
1Department of Clinical Sciences Clinical Research Centre Lund University Skåne University Hospital Malmö Sweden.
Insights
Changes in complete blood count (CBC) in children at risk for type 1 diabetes correlate with glucose metabolism markers. Decreased red blood cell indices are linked to higher HbA1c and fasting glucose levels.
Area of Science:
- Pediatric endocrinology
- Immunology
- Hematology
Background:
- Type 1 diabetes (T1D) is an autoimmune disease with a significant genetic component.
- Early identification of at-risk children through genetic screening and autoantibody testing is crucial.
- Monitoring metabolic changes in high-risk children can provide insights into disease progression.
Purpose of the Study:
- To examine the association between complete blood count (CBC) parameters and glucose metabolism markers (oral glucose tolerance tests [OGTT] and HbA1c) over time.
- To investigate these associations in children with islet autoantibodies and increased genetic predisposition to T1D.
- To understand potential hematological indicators of early metabolic dysfunction in T1D development.
Main Methods:
- Utilized data from the Environmental Determinants of Diabetes in the Young (TEDDY) study.
- Analyzed CBC, OGTT, and HbA1c data from 89 Swedish children with islet autoantibodies (median age 8.8 years) over a median follow-up of 2.3 years (up to 5 years).
- Employed a statistical mixed-effects model to assess the relationship between CBC parameters and glucose metabolism indicators.
Main Results:
- Higher HbA1c levels over time correlated with an increased number of autoantibodies.
- Decreases in mean corpuscular hemoglobin (MCH) and mean cell volume (MCV) were associated with rising HbA1c.
- Reduced red blood cell (RBC) count, hemoglobin, and hematocrit were linked to increased fasting glucose, while altered RBC parameters were associated with fasting insulin levels.
Conclusions:
- Declining RBC indices (MCH, MCV) alongside increasing HbA1c suggest deteriorating glucose metabolism.
- Decreases in RBC count and its parameters correlating with rising fasting glucose in seroconverted children may indicate subclinical beta-cell dysfunction.
- Hematological changes observed in at-risk children could serve as early markers of autoimmune-driven metabolic impairment in type 1 diabetes.
Objectives:
To investigate whether changes in complete blood count (CBC) in islet autoantibody positive children with increased genetic risk for type 1 diabetes are associated with oral glucose tolerance tests (OGTT) and HbA1c over time.
Methods:
The Environmental Determinants of Diabetes in the Young (TEDDY) study follows children with increased risk for type 1 diabetes in the United States, Germany, Sweden and Finland. In the current study, 89 Swedish TEDDY children (median age 8.8 years) positive for one or multiple islet autoantibodies were followed up to 5 (median 2.3) years for CBC, OGTT and HbA1c. A statistical mixed effect model was used to investigate the association between CBC and OGTT or HbA1c.
Results:
HbA1c over time increased by the number of autoantibodies (p < .001). Reduction in mean corpuscular haemoglobin (MCH) and mean cell volume (MCV) was both associated with an increase in HbA1c (p < .001). A reduction in red blood cell (RBC) counts (p = .003), haemoglobin (p = .002) and haematocrit (p = .006) levels was associated with increased fasting glucose. Increased red blood cells, haemoglobin, haematocrit and MCH but decreased levels of red blood cell distribution widths (RDW) were all associated with increased fasting insulin.
Conclusions:
The decrease in RBC indices with increasing HbA1c and the decrease in RBC and its parameters with increasing fasting glucose in seroconverted children may reflect an insidious deterioration in glucose metabolism associated with islet beta-cell autoimmunity.
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