Introduction

Type 2 diabetes mellitus (T2DM) frequently contributes to cognitive decline in older adults, often due to underlying endothelial dysfunction. Recent research by Longo M et al. highlights the vital role of Angiogenic T cells (Tang cells) in preserving cognitive health. These specific immune cells, characterized as CD3+CD31+CXCR4+, are essential for vascular repair and maintaining endothelial integrity. Consequently, researchers are exploring how therapeutic interventions can modulate these cells to protect brain function.

This cross-sectional study evaluated 154 patients aged between 60 and 80 years. The participants were divided into those receiving glucagon-like peptide-1 receptor agonists (GLP-1RAs) plus metformin and those on metformin monotherapy. To assess cognitive performance, the team utilized the Montreal Cognitive Assessment (MoCA) and the Mini-Mental State Examination (MMSE). Furthermore, flow cytometry was used to quantify circulating Tang cells in all participants. Interestingly, higher Tang cell levels correlated significantly with better cognitive scores across the entire cohort.

Boosting Cognitive Health through Angiogenic T cells

The study results revealed a significant advantage for patients treated with GLP-1RA therapy. Specifically, the GLP-1RA group exhibited higher levels of circulating Tang cells compared to the metformin-only group. Moreover, these patients achieved superior scores on both the MoCA and MMSE. After applying propensity score matching to control for age and HbA1c, the association between GLP-1RA use and enhanced cognitive performance remained robust. Therefore, the findings suggest that GLP-1RAs may exert neuroprotective effects by improving angiogenic capacity.

In addition to metabolic control, the increase in Tang cells suggests a vascular mechanism for cognitive preservation. Healthy endothelial function is a prerequisite for adequate cerebral blood flow and neuronal health. Because T2DM patients are at a higher risk for vascular-related dementia, these insights are clinically valuable. Clinicians should consider the systemic vascular benefits of GLP-1RAs when managing older adults with T2DM who are at risk of cognitive impairment. Future longitudinal studies will likely clarify if these cellular changes directly prevent long-term cognitive decline.

Frequently Asked Questions

What are Angiogenic T cells?

Angiogenic T cells, or Tang cells, are a subset of T cells that promote the formation of new blood vessels and repair damaged endothelium, which is crucial for vascular health.

How do GLP-1RAs benefit the brain in diabetes?

GLP-1RAs appear to increase the levels of Tang cells and reduce neuroinflammation, potentially improving blood flow and cognitive performance in older adults.

Can metformin alone preserve cognitive function?

While metformin is a foundational treatment for T2DM, this study suggests that adding a GLP-1RA may provide additional cognitive and vascular benefits compared to metformin monotherapy.

Disclaimer: This content is for informational and educational purposes only and does not constitute medical advice or a professional relationship. Always seek the advice of a physician or other qualified health provider with any questions regarding a medical condition. Refer to the latest local and national guidelines for clinical practice.

References

Longo M et al. Angiogenic T cells and cognitive function in older adults with type 2 diabetes treated with GLP-1 receptor agonists. Aging Clin Exp Res. 2026 May 24. doi: 10.1007/s40520-026-03417-0. PMID: 42177747.

Duan J, et al. Potential Role of Glucagon-like Peptide-1 Receptor Agonists in the Treatment of Cognitive Decline and Dementia in Diabetes Mellitus. MDPI. 2023.

Wang S, et al. Effects of GLP-1 receptor agonists on cognitive function in patients with type 2 diabetes: A systematic review and meta-analysis. Diabetes Obes Metab. 2025.