Dlg1 Maintains Dendritic Cell Function by Securing Voltage-Gated K+ Channel Integrity
Xuejiao Dong1, Lisi Wei2, Xueheng Guo3,4
1Ministry of Education Key Laboratory of Protein Sciences, Center for Life Sciences, Collaborative Innovation Center for Diagnosis and Treatment of Infectious Diseases, School of Life Sciences, Beijing Key Laboratory for Immunological Research on Chronic Diseases, Institute for Immunology, Tsinghua University, Beijing 100084, China.
Discs large homologue 1 (Dlg1) is crucial for dendritic cell (DC) function. Loss of Dlg1 impairs DC ability to respond to antigens and support immune responses by affecting ion channels.
Area of Science:
- Immunology
- Cell Biology
- Molecular Biology
Background:
- Dendritic cells (DCs) are vital for adaptive immunity, bridging innate and adaptive responses.
- DCs present antigens and produce cytokines, influencing T cell and antibody (Ab) production.
- The molecular mechanisms regulating DC function, particularly in response to stimulation, require further elucidation.
Purpose of the Study:
- To investigate the role of discs large homologue 1 (Dlg1) in dendritic cell function.
- To determine the impact of Dlg1 deficiency on DC-mediated antibody responses and cytokine production.
- To elucidate the cellular and molecular mechanisms by which Dlg1 regulates DC activity.
Main Methods:
- Generated DC-specific Dlg1 knockout mice (Dlg1fl/flCd11c-Cre-GFP).
- Assessed Ab responses to thymus-independent and thymus-dependent antigens.
- Evaluated DC endocytosis, phagocytosis, and cytokine production upon Toll-like receptor (TLR) stimulation.
- Measured membrane potential changes, potassium ion (K+) efflux, and calcium ion (Ca2+) influx in DCs.
- Analyzed the expression of voltage-gated K+ channels, including Kv1.3.
Main Results:
- DC-specific Dlg1 knockout significantly reduced Ab responses.
- Dlg1-deficient DCs exhibited impaired antigen endocytosis and phagocytosis.
- Loss of Dlg1 compromised proinflammatory cytokine production by DCs upon TLR stimulation.
- Dlg1 is essential for maintaining DC membrane potential by regulating K+ efflux and Ca2+ influx.
- Dlg1 retains the integrity of voltage-gated K+ channels, with its loss decreasing K+ channel expression.
Conclusions:
- Dlg1 plays a critical role in maintaining dendritic cell function, impacting both innate and adaptive immunity.
- Dlg1 regulates DC function by controlling ion channel activity and membrane potential.
- This study reveals a novel axis involving Dlg1 and voltage-gated K+ channels in dendritic cell biology.
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