Dual Regulation of R-Type CaV2.3 Channels by M1 Muscarinic Receptors

  • Jeong, Jin-Young (Department of Brain and Cognitive Sciences, DGIST) ;
  • Kweon, Hae-Jin (Department of Brain and Cognitive Sciences, DGIST) ;
  • Suh, Byung-Chang (Department of Brain and Cognitive Sciences, DGIST)
  • 투고 : 2015.10.20
  • 심사 : 2016.02.05
  • 발행 : 2016.04.30


Voltage-gated $Ca^{2+}$ ($Ca_V$) channels are dynamically modulated by Gprotein-coupled receptors (GPCR). The $M_1$ muscarinic receptor stimulation is known to enhance $Ca_V2.3$ channel gating through the activation of protein kinase C (PKC). Here, we found that $M_1$ receptors also inhibit $Ca_V2.3$ currents when the channels are fully activated by PKC. In whole-cell configuration, the application of phorbol 12-myristate 13-acetate (PMA), a PKC activator, potentiated $Ca_V2.3$ currents by ~two-fold. After the PMA-induced potentiation, stimulation of $M_1$ receptors decreased the $Ca_V2.3$ currents by $52{\pm}8%$. We examined whether the depletion of phosphatidylinositol 4,5-bisphosphate ($PI(4,5)P_2$) is responsible for the muscarinic suppression of $Ca_V2.3$ currents by using two methods: the Danio rerio voltage-sensing phosphatase (Dr-VSP) system and the rapamycin-induced translocatable pseudojanin (PJ) system. First, dephosphorylation of $PI(4,5)P_2$ to phosphatidylinositol 4-phosphate (PI(4)P) by Dr-VSP significantly suppressed $Ca_V2.3$ currents, by $53{\pm}3%$. Next, dephosphorylation of both PI(4)P and $PI(4,5)P_2$ to PI by PJ translocation further decreased the current by up to $66{\pm}3%$. The results suggest that $Ca_V2.3$ currents are modulated by the $M_1$ receptor in a dual mode-that is, potentiation through the activation of PKC and suppression by the depletion of membrane $PI(4,5)P_2$. Our results also suggest that there is rapid turnover between PI(4)P and $PI(4,5)P_2$ in the plasma membrane.


$Ca_V2.3$ channel;Danio rerio voltage-sensitive phosphatase(Dr-VSP);$M_1$ muscarinic receptor;$PI(4,5)P_2$;Pseudojanin


연구 과제 주관 기관 : Ministry of Education, Science, & Technology, DGIST


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