Processed sections were mounted onto gelatin-coated slides and coverslipped with Fluoromount (SouthernBiotech, Birmingham, AL, USA). Immunofluorescent signal was ICG-001 solubility dmso detected using an Olympus BX53 upright microscope, the X-Cite 120Q excitation light source (Lumen Dynamics, Mississauga, Ontario, Canada), an Olympus DP72 digital camera, and CellSens Standard 1.6 image acquisition software (Olympus, Tokyo, Japan). After initial analysis of UBL and AT8 immunofluorescence, slides were decoverslipped by immersion in PB, counterstained with the pan-amyloid binding dye,

X-34, a highly fluorescent derivative of Congo red which detects NFT and Aβ plaques with greater sensitivity than thioflavin-S,[15, 16] and coverslipped with Vectashield Hard Set mounting medium with a DNA-specific fluorescent probe DAPI (Vector, Burlingame, CA, USA). Sections were then reanalyzed; X-34 did not interfere with either immunofluorescent marker signal, and was distinguished easily from the 4′,6-diamino-2-phenylindole (DAPI) labeling of cell nuclei. Confirmation of fluorescence co-labeling of the four fluorescent markers was achieved using an Olympus BX51 upright microscope equipped with an Olympus DSU spinning disk confocal and motorized stage controlled by both StereoInvestigator (Version 8.0, MBF Bioscience, Williston, VT, USA) and SlideBook 4.2 (Intelligent Imaging Innovations, Denver, CO, USA) software,

using https://www.selleckchem.com/products/PD-0325901.html Lumen200Pro metal halide illumination and a 60X 1.4 N.A. oil immersion objective. The four fluorescent markers were completely dissociable by color (UBL, AT8, X-34/DAPI) and subcellular localization (X-34, DAPI). Additional sections from each case were processed with cresyl violet to delineate the cytoarchitectural boundaries of the hippocampus as defined by Duvernoy.[17] Two independent

evaluators determined intensity of the chromogen-based UBL immunoreactivity qualitatively on a scale from 0 (no immunoreactivity) to ++++ (most intense immunoreactivity, see Table 2). To reflect the variability in the immunoreactive signal between neurons in CA1 region of the Braak stage III–IV group, two scores are presented (Table 2). Quantification of chromogen-based UBL immunohistochemical learn more optical density was performed as described previously[18] using Image J freeware.[19] Optical density was measured in the cytoplasm and nucleoplasm of pyramidal neurons in the CA1 and CA2/3 fields, and multipolar neurons in the CA4 field. Due to individual variation in overall intensity of UBL immunoreactivity between cases in each Braak staged group, analyses are presented as the ratio of nucleoplasm-to-cytoplasm optical density values in the same sections/cases. Data was compared using the Kruskal Wallis test with Dunn’s multiple comparison post hoc test, and Spearman rank order correlation tests, as the data did not conform to the prerequisites for parametric statistical testing. Significance values less than P = 0.