Journal: Cell reports
Article Title: TRPM2 enhances ischemic excitotoxicity by associating with PKCγ
doi: 10.1016/j.celrep.2024.113722
Figure Lengend Snippet: (A) Graphic illustration showing how TAT-M2PBM works. The PKCγ binding motif of TRPM2 (M2PBM) in conjugation with the cell-penetrating peptide TAT was synthesized. TAT-M2PBM binds to the TRPM2 binding site for PKCγ, thus achieving the competitive inhibition on the binding of TRPM2 to PKCγ. (B) Co-immunoprecipitation of PKCγ by TRPM2 in HEK293T cells co-expressed with PKCγ and TRPM2 treated with TAT-SC (scramble) or TAT-M2PBM at 1 μM for 2 h. (C and D) Whole-cell current recording of TRPM2 in HEK293T cells transfected with PKCγ and TRPM2 treated with TAT-SC (green) or TAT-M2PBM (red). (C) Representative traces. PMA (10 μM) was used to induce TRPM2 activation, NMDG to test seal tightness, and ACA to block TRPM2 current. (D) Quantification of current amplitude (n = 9, 9). (E and F) CKAR real-time imaging in HEK293T cells transfected with PKCγ and TRPM2 treated with TAT-SC (green) or TAT-M2PBM (red). (E) Averaged representative traces from 5 randomly chosen cells. (F) Quantification of FRET changes (n = 10–20). (G and H) Whole-cell current recording of NMDARs in HEK293T cells transfected with NMDARs/PKCγ and TRPM2 treated with TAT-SC (green) or TAT-M2PBM (red). (G) Representative traces. NMDA (100 μM) was used to induce NMDAR activation. (H) Quantification of current amplitude (n = 11, 10, 11). (I and J) Whole-cell current recording of NMDARs in neurons isolated from the WT and M2KO mice treated with TAT-SC or TAT-M2PBM. (I) Representative traces. (J) Quantification of current amplitude (n = 15, 11, 9, 6). (K and L) Surface expression of GluN2a and GluN2b in HEK293T cells transfected with NMDAR/PKCγ and TRPM2 treated with TAT-SC or TAT-M2PBM. (K) Representative western blot (WB) bands. (L) Quantification of relative expression normalized to pan-cadherin (n = 6/group). (M–O) Whole-cell current recording of NMDARs in neurons isolated from the WT and M2KO mice treated with TAT-SC or TAT-M2PBM. (M) Representative traces. PMA at 10 μM was used to enhance NMDAR’s activity for 60 s. (N) Quantification of current amplitude before and after PMA perfusion. (O) Quantification of current increases after PMA perfusion (n = 6–10/group). ns, no statistical significance, *p < 0.05, **p < 0.01, ***p < 0.001; unpaired t test; mean ± SEM.
Article Snippet: Rabbit polyclonal antibodies to TRPM2 (Novus, NB110–81601, 1:50 in protein extraction for IP); Rabbit polyclonal antibodies to GluN2A (Cell Signaling Technology, 4205S, 1:1000 in 5% BSA for WB).
Techniques: Binding Assay, Conjugation Assay, Synthesized, Inhibition, Immunoprecipitation, Transfection, Activation Assay, Blocking Assay, Imaging, Isolation, Expressing, Western Blot, Activity Assay