Chapter 12 P2Y6-Evoked Microglial Phagocytosis

Kazuhide Inoue, Schuichi Koizumi, Ayako Kataoka, Hidetoshi Tozaki-Saitoh, Makoto Tsuda

Research output: Chapter in Book/Report/Conference proceedingChapter

38 Citations (Scopus)


While it was reported that microglia is engaged in the clearance of dead cells or dangerous debris, the mechanism of phagocytosis is still unclear. Recently, we found that purinergic system has a very important role for the chemotaxis and phagocytosis of microglia. When neighboring cells are injured, the cells release or leak ATP into extracellular space and microglia rapidly move toward or extend a process to the nucleotides as chemotaxis through P2Y12 receptors of microglia. In the meanwhile, microglia expressing metabotropic P2Y6 receptors show phagocytosis by the stimulation of uridine 5′-diphosphate (UDP), an agonist of P2Y6. UDP/UTP is leaked when hippocampal neurons are damaged by kainic acid (KA) in vivo and in vitro. Systemic administration of KA in rats results in neuronal cell death in the hippocampal CA1 and CA3 regions, where mRNA for P2Y6 receptors increases activated microglia. Thus, the P2Y6 receptor is upregulated when neurons are damaged, and would function as a sensor for phagocytosis by sensing diffusible UDP signals.

Original languageEnglish
Title of host publicationInternational Review of Neurobiology - 85
EditorsG. Bagetta, T. Sakurada, S. Sakurada, M.T. Corasaniti
Number of pages5
Publication statusPublished - 2009

Publication series

NameInternational Review of Neurobiology
ISSN (Print)0074-7742

All Science Journal Classification (ASJC) codes

  • Clinical Neurology
  • Cellular and Molecular Neuroscience


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