Journal: Journal of Cell Science
Article Title: Divergent G-protein selectivity across melanopsins from mice and humans
doi: 10.1242/jcs.258474
Figure Lengend Snippet: Gα s signalling in splice variants of mouse melanopsin. (A) Immunocytochemistry photomicrograph showing musOpn4L (green, top) and musOpn4S (green, bottom) in HEK293T cells (DAPI-stained nuclei, blue). (B–I) Changes in bioluminescence in response to a 1s flash of light (arrow), normalised to 1 at the time of stimulus, from HEK293 cells expressing the cAMP reporter GloSensor and either musOpn4L (B,D,F,H) or musOpn4S (C,E,G,I). (B,C) Responses across a range of flash intensities (key below the graphs) for musOpn4L (B, top) and musOpn4S (C, top). n =4. Brackets indicate regions shown beneath with constrained y axes. (D,E) HEK293T cells treated with PTX to eliminate G i/o signalling or (F,G) HEK293 ΔGs/Gq/G12 cells exposed to a 470 nm flash at a range of light intensities (key below B and C). D, n =4; E, n =5; F, n =3; G, n =4. (H,I) HEK293 ΔGs/Gq/G12 cells treated with PTX with (blue in H, green in I) or without (black) transfection of a Gα s expression vector, exposed to a 1 s 470 nm 14.09 log photon/cm 2 /sec light flash (H, n =4; I, n =4). Data expressed as mean±s.e.m. Cells pretreated with 2 µM forskolin to elevate starting level of cAMP for traces in B,C,F,G. NLU, normalised luminescence units. n values denote biological replicates from independent transfections.
Article Snippet: Fixed cells were permeabilised in 10% Triton-X100 (Sigma-Aldrich), blocked for 30 min in phosphate-buffered saline (PBS) containing 5% serum (donkey) prior to incubation at room temperature for 1 h with the relevant primary antibody [anti-1D4 mouse IgG (Abcam, AB5417) used at 1:500 for hOPN4, musOpn4S and musOpn4L in A and Fig. S2 ; anti-mouse Opn4 rabbit polyclonal (ATS-Bio, AB-N39) used at 1:1000 for musOpn4S and musOpn4SL in A] in 1% donkey serum, washed in PBS and incubated for a further 30 min with 10 μg/ml Alexa Fluor 488-conjugated secondary antibody (donkey anti-mouse or anti-rabbit IgG; Life Technologies).
Techniques: Immunocytochemistry, Staining, Expressing, Transfection, Plasmid Preparation