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Journal: iScience
Article Title: Exendin-4 promotes retinal ganglion cell survival and function by inhibiting calcium channels in experimental diabetes
doi: 10.1016/j.isci.2023.107680
Figure Lengend Snippet: Involvement of intracellular Ca 2+ , CaM, calcineurin and PP1 in suppression of I LCa by Ex-4 (A and B) Representative recordings from an RGC at −10 mV, showing that during internal infusion of Ca 2+ -free solution (containing 10 mM BAPTA; control), Ex-4 failed to suppress the I LCa , and summary data are shown in (B) (n = 6). (C and E) Current traces of two RGCs, showing that during internal dialysis of 5 mg/mL heparin (C), but not ryanodine (50 μM, E), the Ex-4-induced suppression of I LCa was seen. (D and F) Bar charts summarizing the effects of Ex-4 on the I LCa amplitudes in the presence of heparin (n = 7) (D) or ryanodine (n = 7) (F). (G, I, and K) Representative recordings obtained from three different RGCs showing that Ex-4 no longer reduced the I LCa amplitudes during the internal infusion of 100 μM W-7 (G), 50 μM FK-506 (I) and 1 μM OA (K) to block CaM, calcineurin and PP1, respectively. (H, J, and L) Bar charts summarizing the results regarding the effects of W-7 (n = 7) (H), FK-506 (n = 8) (J) or OA (n = 8) (L). (M and N) Current traces of an RGC, showing that perfusion of C2 Ceramide (500 nM) suppressed the I LCa (M), and summary data are shown in (N) (n = 6). Data are presented as mean ± SD, n.s., p > 0.05, ∗∗p < 0.01 and ∗∗∗p < 0.001 by paired t test. (O) Representative immunoblots showed changes in the expression of L-VGCC subunits Cav1.2 and p -Cav1.2 in membrane components in retinas from the control, DM rats treated with or without Ex-4 eye drops. Na + -K + -ATPase served as loading control. (P and Q) Densitometric analysis revealing a significant increase in Cav1.2 (P) and p -Cav1.2 (Q) protein levels in DM retinas. Topical administration of Ex-4 significantly decreased Cav1.2 and p -Cav1.2 levels in DM retinas. (R) Quantitative analysis of p -Cav1.2 relative to Cav1.2 total protein is shown in the bar graph. The level of p -Cav1.2/Cav1.2 did not change in DM retinas, but significantly decreased in the DM + Ex-4 group. n = 3 for each group. Data are presented as mean ± SD. n.s., p > 0.05, ∗∗p < 0.01, ∗∗∗p < 0.001 and ∗∗∗∗p < 0.0001 by post hoc Tukey’s multiple comparisons test after one-way ANOVA. See also Figure S3 .
Article Snippet: Rabbit polyclonal anti-Cav1.2 (CACNA1C) , Alomone , Cat#ACC-003; RRID: AB_2039771.
Techniques: Blocking Assay, Western Blot, Expressing, Membrane, Eye Drops