Fig 2: A2A-D2 heterodimers on rat striatal astrocytes: proximity ligation assay. Detection of in situ PLA A2A-D2 heteroreceptor complexes was carried out with primary antibodies (rabbit polyclonal anti-A2AR, mouse monoclonal anti-D2R and goat polyclonal anti-GFAP) in rat striatal slices. (A) The merge of the maximum intensity projections of a representative field (240x240 µm; z 10 µm) is shown; GFAP (red), DAPI (blue), PLA for A2A-D2 heteroreceptor complexes appears as yellow clusters. The boxed region (i) is shown at a higher magnification in (B). (C) Merged confocal images of a single z stack of the boxed region (ii) at a higher magnification: double immunolabeling for GFAP (red) and PLA A2A-D2 heteroreceptor complexes (green). (D) Colocalized map of the boxed region (ii); the colocalization analysis plugins—colocalization threshold with GFAP as ROI—was used to create the colocalized map; ImageJ Fiji software. A complete lack of stain for PLA A2A-D2 heteroreceptor complexes was obtained in the negative control experiments, performed avoiding the conjugation of a primary antibody with the Duolink Probes. In the figure the merges of the maximum intensity projections of two representative fields are shown: PLA for A2A-D2. heteroreceptor complexes without the primary anti-A2A antibody (E) or the primary anti-D2 antibody (F). Scale bar 25 µm or 10 µm