The immunohistochemical study was performed as previously described [57 (link),58 (link)]. Primary antibodies used were: anti-GFAP (Santa Cruz Biotechnology, 1:100 in PBS, v/v), anti-Iba1 (Santa Cruz Biotechnology, 1:100 in PBS, v/v), anti-TH (Millipore, 1:500 in PBS, v/v, Burlington, MA, USA), anti-DAT (Santa Cruz Biotechnology, 1:300 in PBS, v/v), anti-α-syn (Santa Cruz Biotechnology, 1:100 in PBS, v/v). The slices were then rinsed with PBS and treated with secondary antibody the next day. A biotin-conjugated goat anti-rabbit IgG and an avidin-biotin peroxidase complex were used to identify specific labeling (Vector). Five stained sections from each mouse were scored blindly and examined using a Leica DM6 microscope (Leica Microsystems SpA, Milan, Italy) in accordance with standard procedures [59 (link),60 (link)]. The histogram profile is related to the positive pixel intensity value obtained.
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