T2D Research

Gu et al. 2024 Single-Cell PBMCs in Type 2 Diabetes

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tagsreference, type-2-diabetes, pbmc, immunology, transcriptomics
aliasesGu et al. 2024 Single-Cell PBMCs in Type 2 Diabetes

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Gu et al. 2024 Single-Cell PBMCs in Type 2 Diabetes

Gu et al. analyzed PBMC from non-diabetes and type 2 diabetes participants using single-cell transcriptomics paired with TCR and BCR repertoire profiling. The study supports PBMC immune changes in type 2 diabetes by showing altered cell composition, inflammatory monocyte states, cytotoxic T-cell expansion, and B-cell differentiation in T2D.

Bibliographic Details

  • Citation: Doeon Gu, Jinyeong Lim, Kyung Yeon Han, In-Ho Seo, Jae Hwan Jee, Soo Jin Cho, Yoon Ho Choi, Sung Chul Choi, Jang Hyun Koh, Jin-Young Lee, Mira Kang, Dong-Hyuk Jung, and Woong-Yang Park. 2024. “Single-cell analysis of human PBMCs in healthy and type 2 diabetes populations: dysregulated immune networks in type 2 diabetes unveiled through single-cell profiling.” Frontiers in Endocrinology 15:1397661.
  • DOI: 10.3389/fendo.2024.1397661.
  • Data accession: GSE268210.
  • Study population: 34 non-diabetes and 37 T2D participants recruited in Korea.

Study Design

  • The authors profiled PBMCs from 34 non-diabetes donors and 37 T2D patients, with groups matched on sex, age, and BMI.
  • T2D was defined by fasting plasma glucose, two-hour OGTT glucose, HbA1c, or current oral anti-diabetic medication use.
  • The analysis included 293,923 PBMCs after filtering.
  • 10x Genomics 5’ single-cell expression libraries were paired with TCR and BCR V(D)J libraries.
  • CellRanger, Seurat, Harmony, DESeq2 pseudobulk analysis, clusterProfiler GO enrichment, CellChat, TCR clonality, and BCR isotype analyses were used.

Main Findings

  • T2D PBMCs showed altered cell composition: NK cells and CD16 monocytes were higher in T2D, while B cells and CD14 monocytes were more abundant in non-diabetes.
  • T2D monocytes showed inflammatory and antigen-presentation features, including elevated CD14 monocyte pro-inflammatory scores and higher MHC class II gene expression in intermediate monocytes.
  • CD14 monocytes in T2D had increased outgoing interaction strength and increased RETN-CAP1 interactions with CD4 cytotoxic T cells, CD8 effector memory T cells, gamma-delta T cells, and MAIT cells.
  • T2D cytotoxic T-cell subsets showed higher cytotoxicity scores, increased CD8 Tem KLRG1 expression, and greater clonal expansion than non-diabetes controls.
  • T2D B-cell states shifted toward intermediate B cells and plasma cells, with increased BCR isotype diversity and more IgA/IgG antibody-related signal.

Interpretation For This Paper

  • The paper is directly relevant background evidence for PBMC immune remodeling in T2D, especially for distinguishing cell-composition shifts from cell-state changes.
  • It provides a single-cell example of innate and adaptive immune remodeling in T2D but does not test ancestry-associated immune differences directly.
  • Because the cohort is Korean and the non-diabetes samples came from a COVID-19 project, the study is useful for ancestry/geography-aware framing but should not be treated as a multi-ancestry comparison.

Limitations Noted By The Authors

  • Medication information for T2D patients was not presented.
  • Non-diabetes classification relied on recruitment-questionnaire information, though the authors argue regular Korean health checks support the classification.
  • Flow cytometry or other functional validation is needed to confirm immune-cell proportions and functions.
  • The CD14 monocyte inflammation score correlated with BMI, but the reported correlation was modest.

Sources

  • _raw/fendo-15-1397661.pdf

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