Mol Cell Biol. 2005 Sep;25(18):8285-98.

PKD2 functions as an epidermal growth factor-activated plasma membrane channel.External 2231691f894ba696de1310221b0a0dbbb31a7251e75115c265587c3d9d5f507c

Ma, R., Li, W. P., Rundle, D., Kong, J., Akbarali, H. I., Tsiokas, L.,
["Department of Cell Biology, University of Oklahoma Health Sciences Center, 941 Stanton L. Young Boulevard, Oklahoma City, OK 73104, USA."]
PKD2, or polycystin 2, the product of the gene mutated in type 2 autosomal dominant polycystic kidney disease, belongs to the transient receptor potential channel superfamily and has been shown to function as a nonselective cation channel in the plasma membrane. However, the mechanism of PKD2 activation remains elusive. We show that PKD2 overexpression increases epidermal growth factor (EGF)-induced inward currents in LLC-PK(1) kidney epithelial cells, while the knockdown of endogenous PKD2 by RNA interference or the expression of a pathogenic missense variant, PKD2-D511V, blunts the EGF-induced response. Pharmacological experiments indicate that the EGF-induced activation of PKD2 occurs independently of store depletion but requires the activity of phospholipase C (PLC) and phosphoinositide 3-kinase (PI3K). Pipette infusion of purified phosphatidylinositol-4,5-bisphosphate (PIP(2)) suppresses the PKD2-mediated effect on EGF-induced conductance, while pipette infusion of phosphatidylinositol-3,4,5-trisphosphate (PIP(3)) does not have any effect on this conductance. Overexpression of type Ialpha phosphatidylinositol-4-phosphate 5-kinase [PIP(5)Kalpha], which catalyzes the formation of PIP(2), suppresses EGF-induced currents. Biochemical experiments show that PKD2 physically interacts with PLC-gamma2 and EGF receptor (EGFR) in transfected HEK293T cells and colocalizes with EGFR and PIP(2) in the primary cilium of LLC-PK(1) cells. We propose that plasma membrane PKD2 is under negative regulation by PIP(2). EGF may reduce the threshold of PKD2 activation by mechanical and other stimuli by releasing it from PIP(2)-mediated inhibition.
PMID: 16135816External 2231691f894ba696de1310221b0a0dbbb31a7251e75115c265587c3d9d5f507c
Arrow2 1fb2b8a5ad55723bad55961567d092af30310a7cf44ded6f695fc2aa4753ec2b Screening Arrow2 1fb2b8a5ad55723bad55961567d092af30310a7cf44ded6f695fc2aa4753ec2b Validation: In vitro validation Arrow2 1fb2b8a5ad55723bad55961567d092af30310a7cf44ded6f695fc2aa4753ec2b Validation: In vivo validation Arrow2 1fb2b8a5ad55723bad55961567d092af30310a7cf44ded6f695fc2aa4753ec2b Characterization Arrow2 1fb2b8a5ad55723bad55961567d092af30310a7cf44ded6f695fc2aa4753ec2b Functional consequence Arrow2 1fb2b8a5ad55723bad55961567d092af30310a7cf44ded6f695fc2aa4753ec2b top
Screening Toggle 893349bafcc528f8346c51dc3420151d67b0126b2c122dd1017121c03fa0f69b
  Experimental screening Non-experimental screening Reference
TRP channel construct Interactor source
TRP channel Interactor Method Species Region Species Organ/tissue Sample type
TRPP1 Link 2bd4d11adb659cddf58197a94e201f0a44c55d8d7cb427c624971b42e122c0a4 EGFR Inference Prediction 16135816
TRPP1 Link 2bd4d11adb659cddf58197a94e201f0a44c55d8d7cb427c624971b42e122c0a4 PLCƣ2 Inference Prediction 16135816
(Link 2bd4d11adb659cddf58197a94e201f0a44c55d8d7cb427c624971b42e122c0a4: click the arrow icon to show interactions only between the corresponding TRP channel and the interactor)
Arrow2 1fb2b8a5ad55723bad55961567d092af30310a7cf44ded6f695fc2aa4753ec2b Screening Arrow2 1fb2b8a5ad55723bad55961567d092af30310a7cf44ded6f695fc2aa4753ec2b Validation: In vitro validation Arrow2 1fb2b8a5ad55723bad55961567d092af30310a7cf44ded6f695fc2aa4753ec2b Validation: In vivo validation Arrow2 1fb2b8a5ad55723bad55961567d092af30310a7cf44ded6f695fc2aa4753ec2b Characterization Arrow2 1fb2b8a5ad55723bad55961567d092af30310a7cf44ded6f695fc2aa4753ec2b Functional consequence Arrow2 1fb2b8a5ad55723bad55961567d092af30310a7cf44ded6f695fc2aa4753ec2b top
Validation: In vivo validation Toggle 893349bafcc528f8346c51dc3420151d67b0126b2c122dd1017121c03fa0f69b
  Assay with endogenous proteins Assay with overexpressed proteins Reference
Cell or tissue Cell or tissue TRP channel construct Interactor construct
TRP channel Interactor Method Species Region Species Region
TRPP1 Link 2bd4d11adb659cddf58197a94e201f0a44c55d8d7cb427c624971b42e122c0a4 EGFR Co-immunoprecipitation HEK293T Human Full-length Human Full-length 16135816
TRPP1 Link 2bd4d11adb659cddf58197a94e201f0a44c55d8d7cb427c624971b42e122c0a4 EGFR Co-immunofluorescence staining LLC-PK1 16135816
TRPP1 Link 2bd4d11adb659cddf58197a94e201f0a44c55d8d7cb427c624971b42e122c0a4 PLCƣ2 Co-immunoprecipitation HEK293T Human Full-length Not specified Full-length 16135816
(Link 2bd4d11adb659cddf58197a94e201f0a44c55d8d7cb427c624971b42e122c0a4: click the arrow icon to show interactions only between the corresponding TRP channel and the interactor)
Arrow2 1fb2b8a5ad55723bad55961567d092af30310a7cf44ded6f695fc2aa4753ec2b Screening Arrow2 1fb2b8a5ad55723bad55961567d092af30310a7cf44ded6f695fc2aa4753ec2b Validation: In vitro validation Arrow2 1fb2b8a5ad55723bad55961567d092af30310a7cf44ded6f695fc2aa4753ec2b Validation: In vivo validation Arrow2 1fb2b8a5ad55723bad55961567d092af30310a7cf44ded6f695fc2aa4753ec2b Characterization Arrow2 1fb2b8a5ad55723bad55961567d092af30310a7cf44ded6f695fc2aa4753ec2b Functional consequence Arrow2 1fb2b8a5ad55723bad55961567d092af30310a7cf44ded6f695fc2aa4753ec2b top
Characterization Toggle 893349bafcc528f8346c51dc3420151d67b0126b2c122dd1017121c03fa0f69b
  Binding region mapping Stoichiometry Affinity (Kd) Reference
TRP channel Interactor
TRP channel Interactor Method Species Region Species Region
TRPP1 Link 2bd4d11adb659cddf58197a94e201f0a44c55d8d7cb427c624971b42e122c0a4 EGFR Co-immunoprecipitation Human 1-871 Human Not determined 16135816
TRPP1 Link 2bd4d11adb659cddf58197a94e201f0a44c55d8d7cb427c624971b42e122c0a4 PLCƣ2 Co-immunoprecipitation Human 1-379 Not specified Not determined 16135816
(Link 2bd4d11adb659cddf58197a94e201f0a44c55d8d7cb427c624971b42e122c0a4: click the arrow icon to show interactions only between the corresponding TRP channel and the interactor)
TRP / Interactor

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