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Dev Cell. 2013 Oct 28;27(2):215-226. doi: 10.1016/j.devcel.2013.09.021.

A network of interactions enables CCM3 and STK24 to coordinate UNC13D-driven vesicle exocytosis in neutrophils.

Author information

1
Department of Pharmacology, Yale School of Medicine, New Haven, CT 06520, USA; Department of Vascular Biology and Therapeutic Program, Yale School of Medicine, New Haven, CT 06520, USA.
2
Department of Vascular Biology and Therapeutic Program, Yale School of Medicine, New Haven, CT 06520, USA; Department of Pathology, Yale School of Medicine, New Haven, CT 06520, USA.
3
Department of Cell Biology, Yale School of Medicine, New Haven, CT 06520, USA.
4
Department of Internal Medicine, Yale School of Medicine, New Haven, CT 06520, USA.
5
Key Laboratory of Stem Cell Biology, Institute of Health Sciences, Shanghai Institutes for Biological Sciences, Chinese Academy of Sciences and Shanghai Jiao Tong University School of Medicine, 200025 Shanghai, China.
6
Department of Pharmacology, Yale School of Medicine, New Haven, CT 06520, USA.
7
Department of Vascular Biology and Therapeutic Program, Yale School of Medicine, New Haven, CT 06520, USA; Department of Pathology, Yale School of Medicine, New Haven, CT 06520, USA. Electronic address: wang.min@yale.edu.
8
Department of Pharmacology, Yale School of Medicine, New Haven, CT 06520, USA; Department of Vascular Biology and Therapeutic Program, Yale School of Medicine, New Haven, CT 06520, USA. Electronic address: dan.wu@yale.edu.

Abstract

Neutrophil degranulation plays an important role in acute innate immune responses and is tightly regulated because the granule contents can cause tissue damage. However, this regulation remains poorly understood. Here, we identify the complex of STK24 and CCM3 as being an important regulator of neutrophil degranulation. Lack of either STK24 or CCM3 increases the release of a specific granule pool without affecting other neutrophil functions. STK24 appears to suppress exocytosis by interacting and competing with UNC13D C2B domain for lipid binding, whereas CCM3 has dual roles in exocytosis regulation. Although CCM3 stabilizes STK24, it counteracts STK24-mediated inhibition of exocytosis by recruiting STK24 away from the C2B domain through its Ca(2+)-sensitive interaction with UNC13D C2A domain. This STK24/CCM3-regulated exocytosis plays an important role in the protection of kidneys from ischemia-reperfusion injury. Together, these findings reveal a function of the STK24 and CCM3 complex in the regulation of ligand-stimulated exocytosis.

PMID:
24176643
PMCID:
PMC3834565
DOI:
10.1016/j.devcel.2013.09.021
[Indexed for MEDLINE]
Free PMC Article

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