BAI1

ADGRB1
Identifiants
AliasesADGRB1, BAI1, Brain-specific angiogenesis inhibitor 1
IDs externesOMIM: 602682 MGI: 1933736 HomoloGene: 1287 GeneCards: ADGRB1
Wikidata
Voir/Editer HumainVoir/Editer Souris

Le BAI1 (« Brain-specific angiogenesis inhibitor 1 ») est une protéine de la famille des récepteurs couplés aux protéines G à adhésion. Son gène est le BAI1 situé sur le chromosome 8 humain.

Rôles

Il est exprimé au niveau des synapses et sa stimulation permet l'activation la voie du facteur Rho et ERK[5]. Stimulé par les protéines Par3 et TIAM1, Il favorise la formation des synapses[6], intervenant dans la plasticité synaptique, en particulier au niveau de l'hippocampe[7].

Il a une activité inhibitrice de l'angiogenèse[8] : la protéine peut être clivée donnant la vasculostatine 40 (pour son poids moléculaire exprimé en daltons), cette dernière ayant la propriété d'anti-angiogenèse[9].

Il régule la phagocytose[10] et favorise la fusion des myoblastes[11].

En médecine

Son expression est fortement diminuée dans les glioblastomes[12], probablement par l'intermédiaire d'une surexpression du gène MBD2[13].

Notes et références

  1. a b et c GRCh38: Ensembl release 89: ENSG00000181790 - Ensembl, May 2017
  2. a b et c GRCm38: Ensembl release 89: ENSMUSG00000034730 - Ensembl, May 2017
  3. « Publications PubMed pour l'Homme », sur National Center for Biotechnology Information, U.S. National Library of Medicine
  4. « Publications PubMed pour la Souris », sur National Center for Biotechnology Information, U.S. National Library of Medicine
  5. Stephenson JR, Paavola KJ, Schaefer SA, Kaur B, Van Meir EG, Hall RA, Brain-specific angiogenesis inhibitor-1 signaling, regulation, and enrichment in the postsynaptic density, J Biol Chem, 2013;288:22248–22256
  6. Duman JG, Tzeng CP, Tu YK et al. The adhesion-GPCR BAI1 regulates synaptogenesis by controlling the recruitment of the Par3/Tiam1 polarity complex to synaptic sites, J Neurosci, 2013;33:6964–6978
  7. Zhu D, Li C, Swanson AM et al. BAI1 regulates spatial learning and synaptic plasticity in the hippocampus, J Clin Invest, 2015;125:1497–1508
  8. Nishimori H, et al. A novel brain-specific p53-target gene, BAI1, containing thrombospondin type 1 repeats inhibits experimental angiogenesis. Oncogene, 1997;15:2145–2150
  9. Cork SM, Kaur B, Devi NS et al. A proprotein convertase/MMP-14 proteolytic cascade releases a novel 40 kDa vasculostatin from tumor suppressor BAI1, Oncogene, 2012;31:5144–5152
  10. Cork SM, Van Meir EG, Emerging roles for the BAI1 protein family in the regulation of phagocytosis, synaptogenesis, neurovasculature, and tumor development, J Mol Med (Berl), 2011;89:743–752
  11. Hochreiter-Hufford AE, Lee CS, Kinchen JM et al. Phosphatidylserine receptor BAI1 and apoptotic cells as new promoters of myoblast fusion, Nature, 2013;497:263–267
  12. Kaur B, Brat DJ, Calkins CC, Van Meir EG, Brain angiogenesis inhibitor 1 is differentially expressed in normal brain and glioblastoma independently of p53 expression, Am J Pathol, 2003;162:19–27
  13. Zhu D, Hunter SB, Vertino PM, Van Meir EG, Overexpression of MBD2 in glioblastoma maintains epigenetic silencing and inhibits the antiangiogenic function of the tumor suppressor gene BAI1, Cancer Res, 2011;71:5859–5870

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