Single-cell RNA Sequencing-Based analysis of diverse ion-channel transcripts across human CD4⁺ T-cell subsets

Area of Science:

• Immunology
• Molecular Biology
• Cell Biology

Background:

• CD4+ T lymphocytes are crucial for adaptive immunity, with distinct subsets implicated in autoimmune and allergic diseases.
• Ion channels regulate T lymphocyte activation and homeostasis, but their specific expression across human CD4+ T cell subsets is not fully understood.

Purpose of the Study:

• To delineate the ion channel and transporter gene expression landscape across distinct human CD4+ T cell subsets.
• To identify subset-specific ionic regulators that could be targeted for therapeutic intervention in immune-mediated diseases.

Main Methods:

• Isolation of naïve CD4+ T cells from human peripheral blood mononuclear cells.
• In vitro polarization into Th1, Th2, Th17, and regulatory T (Treg) cell subsets.
• Single-cell RNA sequencing (scRNA-seq) for transcriptomic profiling.
• Unsupervised clustering and comparative analysis of ion channel/transporter gene panels.

Main Results:

• scRNA-seq successfully resolved naïve and differentiated CD4+ T cell states.
• Distinct transcript signatures for ion transport genes were observed across subsets.
• Enriched expression of ITPR1 in Th2 cells, STIM2/ORAI3 in Treg cells, and AQP3 in Th17 cells was identified.
• Core components of store-operated calcium entry (SOCE) were broadly detected across all analyzed subsets.

Conclusions:

• This study provides a comprehensive single-cell transcriptomic resource detailing ion transport landscapes in human CD4+ T cell subsets.
• The findings nominate specific ion channels and transporters as potential regulators of CD4+ T cell subset function.
• These data pave the way for future mechanistic studies investigating the role of ion transport in T cell immunity and disease.