Journal: bioRxiv
Article Title: Functional border-associated macrophages limit Alzheimer’s Disease progression
doi: 10.64898/2026.01.31.703045
Figure Lengend Snippet: A , Representative micrographs of X-34 amyloid staining in cortex and hippocampus in 3-5 month-old Cre + 5xFAD (BAM2 depleted) and Cre - (BAM2 sufficient) 5xFAD littermates (top) with regions of interest (ROIs, numbered boxes below) depicting pial and penetrating CD31 + blood vessels in cortex and the hippocampal artery in hippocampus. B , Quantification of X-34 cortical area fraction normalized to littermates at 3-5 mo (n= 11 Cre - , 12 Cre + mice) and 7-9 mo (n=7 Cre - , 6 Cre + mice). C , as with ( B ) but for hippocampus. D , Quantification of the percentage of pial and penetrating blood vessel area covered with CAA, presented as fold change normalized to littermates at 3-5 mo (n= 6 Cre - , 6 Cre + mice) and 7-9mo (n=7 Cre - , 6 Cre + mice) mice. E-H , ELISA based quantification of 3 mo whole brain ( E) soluble Aβ 1-40 (n= 6 Cre - , 7 Cre + mice), ( F) soluble Aβ 1-42 (n= 6 Cre - , 7 Cre + mice), ( G ) insoluble Aβ 1-40 (n= 5 Cre - , 4 Cre + mice), and ( H ) insoluble Aβ 1-42 (n= 6 Cre - , 6 Cre + mice). I , representative micrographs of LAMP1 staining in cortex and hippocampus in 3-5 mo Cre + and Cre - littermates, along with high magnification ROIs (numbered boxes below) in sections. Insets 1 and 2 show sections from Cre + mice depicting LAMP1 localization around X-34 + plaque (Inset 1) and vasculature (Inset 2, showing salient CAA). Inset 3 depicts CA3 granular cell layer in hippocampus from Cre + mice in which LAMP1 staining appears in gaps in NeuN+ neuron staining (red arrows). J , Quantification of cortical LAMP1 area fraction at 3-5mo (n=10 Cre - , 9 Cre + mice) and 7-9mo (n=7 Cre - , 7 Cre + mice); K , as with ( J ) but for hippocampal LAMP1 at 3-5mo (n=9 Cre - , n=12 Cre + mice), and 7-9mo (n= 6 Cre - , 5 Cre + mice). L-M , neuronal loss in Cre + mice. ( L ) representative micrograph depicting NeuN+ neuron staining in cortical layers from 9 mo Cre + and Cre - littermates; M , quantification of L5 neuron number/area normalized to littermates at 3-5 mo (n=6 Cre - , 6 Cre + mice) and 7-9 mo (n=8 Cre - , 6 Cre + ). N-O, behavioral tests. (N), schematic of contextual fear conditioning paradigm; ( O) , quantification of freezing proportion in first 5 minutes of memory retrieval (blue=male (M), red=female (F), n=8 WT M , 7WT F , 11 Cre + M , 10 Cre + F , 11 5xFAD M , 9 5xFAD F , 9 Cre + 5xFAD M , 10 Cre + 5xFAD F ). Main effect of sex (F(1,67)= 10.133, p = 0.002) and Cre status (F(1,67)= 10.012, p = 0.002). P , Schematic of Barnes maze test along with longitudinal design including trials, days, and age (months). Q-S Quantification, Cre x 5xFAD x Age interaction, and 5xFAD main effect respectively of ( Q ) average distance traveled (F(6,1855) = 2.978, p = 0.007) and (F(1,1855) = 6.200, p = 0.013); ( R ) committed (F(6,1856) = 3.267, p = 0.003) and (F(1,1856) = 12.550, p < .001); and ( S ) latency (s) to locate the escape hole for each day and age (F(6,1856) = 2.098, p = 0.051) and (F(1,1856) = 8.447, p = 0.004)). See Materials and Methods for n values). ( A, I ) White dotted line represents hippocampal area. ( B-D, J-K, M, O ) Two-way ANOVA with Sidak’s multiple comparisons test, ( E-H ) two-tailed unpaired t-test, ( Q-S ) Linear Mixed Effects Model with Sidak’s multiple comparisons test. Significant pairwise comparisons within time points indicated by shapes associated with respective genotypes in the panel legend. *P<.05,**P<.01, ***P<.001, ****p<.0001. ( A,I,L ) Scale bars=200µm large images, 50µm high mag ROIs. Fold change normalized to 1 (as average) includes individual values that are not 1; these derive from littermates with the same genotype and slightly different individual values.
Article Snippet: Sections were incubated ON at 4C with the following primary antibodies Goat anti-CD31 (1:150, AF3628, R& D systems), Rabbit anti-IBA1 (1:1000, 019-19741, Wako), Guinea Pig anti-NeuN (1:1000, 266 004, Synaptic systems), Rat anti-CD206 (1:500, MCA2235, Bio-Rad), Rat anti LAMP1 (1:250, 1D4B, DSHB), Rabbit anti-Laminin (1:300, Thermo Fisher, PA116730).
Techniques: Staining, Enzyme-linked Immunosorbent Assay, Two Tailed Test