Format

Send to

Choose Destination
Cardiovasc Diabetol. 2019 Mar 28;18(1):43. doi: 10.1186/s12933-019-0846-9.

Proteomic alterations of HDL in youth with type 1 diabetes and their associations with glycemic control: a case-control study.

Author information

1
Division of Pediatric Endocrinology, Department of Pediatrics, Georgetown University, Washington, DC, 20016, USA. eg685@georgetown.edu.
2
Proteomics and Metabolomics Shared Resource, Georgetown University Medical Center, Washington, DC, USA.
3
Department of Oncology, Lombardi Comprehensive Cancer Center, Georgetown University Medical Center, Washington, DC, USA.
4
Section of Inflammation and Cardiometabolic Diseases, National Heart, Lung, and Blood Institute, National Institutes of Health, Bethesda, MD, USA.
5
Lipoprotein Metabolism Section, National Heart, Lung and Blood Institute, National Institutes of Health, Bethesda, MD, USA.
6
Saha Cardiovascular Research Center, University of Kentucky, Lexington, KY, USA.
7
Department of Physiology, University of Kentucky, Lexington, KY, USA.

Abstract

BACKGROUND:

Patients with type 1 diabetes (T1DM) typically have normal or even elevated plasma high density lipoprotein (HDL) cholesterol concentrations; however, HDL protein composition can be altered without a change in cholesterol content. Alteration of the HDL proteome can result in dysfunctional HDL particles with reduced ability to protect against cardiovascular disease (CVD). The objective of this study was to compare the HDL proteomes of youth with T1DM and healthy controls (HC) and to evaluate the influence of glycemic control on HDL protein composition.

METHODS:

This was a cross-sectional case-control study. Blood samples were obtained from patients with T1DM and HC. HDL was isolated from plasma by size-exclusion chromatography and further purified using a lipid binding resin. The HDL proteome was analyzed by mass spectrometry using label-free SWATH peptide quantification.

RESULTS:

Samples from 26 patients with T1DM and 13 HC were analyzed and 78 HDL-bound proteins were measured. Youth with T1DM had significantly increased amounts of complement factor H related protein 2 (FHR2; adjusted P < 0.05), compared to HC. When patients were analyzed based on glucose control, several trends emerged. Some proteins were altered in T1DM and not influenced by glycemic control (e.g. FHR2) while others were partially or completely corrected with optimal glucose control (e.g. alpha-1-beta glycoprotein, A1BG). In a subgroup of poorly controlled T1DM patients, inter alpha trypsin inhibitor 4 (ITIH4) was dramatically elevated (P < 0.0001) and this was partially reversed in patients with optimal glucose control. Some proteins including complement component C3 (CO3) and albumin (ALB) were significantly different only in T1DM patients with optimal glucose control, suggesting a possible effect of exogenous insulin.

CONCLUSIONS:

Youth with T1DM have proteomic alterations of their HDL compared to HC, despite similar concentration of HDL cholesterol. The influence of these compositional changes on HDL function are not yet known. Future efforts should focus on investigating the role of these HDL associated proteins in regard to HDL function and their role in CVD risk in patients with T1DM. Trial registration NCT02275091.

KEYWORDS:

A1BG; Cardiovascular; HDL; ITIH4; Proteomics; Type 1 diabetes

PMID:
30922315
PMCID:
PMC6437869
DOI:
10.1186/s12933-019-0846-9
[Indexed for MEDLINE]
Free PMC Article

Supplemental Content

Full text links

Icon for BioMed Central Icon for PubMed Central
Loading ...
Support Center