Organoids created from different lines of AD patient iPSCs exhibit AD phenotypes.

<p>(A) Tissue sections from fAD (<i>APP</i>^Dp2-3, ND34732, AG068840) and control (Ctrl; CS-0020-01, AG09173) organoids were processed for immunoreactivity against Aβ (D45D2, white), MAP2 (red), and pTau (S396, green) and labeled with the nuclear dye Hoechst. (B) Quantification of Aβ immunoreactivity in fAD and Ctrl organoids following 90 days of culture. Values between the two control lines did not significantly differ. Number of Aβ-positive aggregates in two size classes (Particle Counts): one-way ANOVA with post-hoc Tukey’s multiple comparisons test; <i>F</i> (4,21) = 6.15, **p = 0.0019, R² = 0.5396 (1–3μm); <i>F</i> (4,21) = 7.95, ***p = 0.0005, R² = 0.6024 (3–6 μm). (C) Quantification of the average intensity of pTau Ser396 immunoreactivity as a fold change of Ctrl in fAD and Ctrl organoids following 90 days of culture. Values between the two control lines did not significantly differ. (Each data point represent one organoid). One-way ANOVA with post-hoc Tukey’s multiple comparisons test; <i>F</i> (4,20) = 9.629, ***p = 0.0002, R² = 0.6582. On charts: *p < 0.05, **p < 0.01, ***p < 0.001.</p

Organoids created from patient-derived iPSCs exhibit robust Alzheimer’s disease (AD)-like pathology.

<p>(A) Concentration of Aβ_1–40 and Aβ_1–42 from supernatant of control (Ctrl; CS-0020-01) and familial AD (fAD; <i>APP</i>^Dp1-1) organoid cultures, measured by ELISA, as well as the ratio of Aβ_1–42 to Aβ_1–40 concentrations. Unpaired two-tailed t-test with equal variance: *p = 0.047 (Aβ_1–40), unpaired two-tailed t-test with Welch’s correction for unequal variance: **p = 0.004 (Aβ_1–42), p = 0.48 (Aβ_1-42/Aβ_1–40). (B) Tissue sections from fAD (<i>APP</i>^Dp1-1) and control (Ctrl; CS-0020-01) organoids were processed for immunoreactivity against amyloid β (Aβ) using two antibodies (D54D2: white, 4G8: green), as well as antibodies against the neuronal marker MAP2 (red) and stained with the nuclear dye Hoechst (blue). Insets demonstrate Aβ immunoreactivity that appears both extracellular (i, arrow) and intracellular (ii, arrowhead) based upon MAP2 co-localization. (C) Z-projection of immunolabeled tissue sections from 90 day old Ctrl and fAD organoids showing immunoreactivity for Aβ (D45D2: white) and MAP2 (red). The edge of the tissue section is visible at the left bottom corner of each example. (D) Quantification of Aβ immunoreactivity in fAD and Ctrl organoids following 60d and 90d culture. Particle Counts: one-way ANOVA with post-hoc Fishers Least Significant Difference (LSD) test for multiple comparisons; <i>F</i> (3,28) = 4.385, ***p = 0 0.0008, R² = 0.32 (i-60 days); <i>F</i> (5,43) = 3.346, *p = 0 0.012, R² = 0.28 (90 days). Particle Size: Two-tailed Mann Whitney test for non-normal distributions (normality α < 0.05), **p = 0.006 (60 days), ***p = 0.001 (90 days). (E) Tissue sections from fAD (<i>APP</i>^Dp1-1) and control (Ctrl; CS-0020-01) organoids were processed for immunoreactivity against phosphorylated Tau (pTau, green) at Serine 396 (S396) and MAP2 (red) following 90d culture. Hoechst (blue) labels cell nuclei. (F) Quantification of pTau immunoreactivity for the Ser396 at 60d and 90d, and for the Threonine 181 (Thr181) pTau at 90d. Values are plotted as mean intensity of immunoreactivity as fold change of Ctrl. Unpaired two-tailed t-test with equal variance: p = 0.67 (60 day Ser396), **p = 0.001 (90 day Ser396), *p = 0.03 (90 day Thr181). (G) Sections from fAD (<i>APP</i>^Dp1-1) and control (Ctrl; CS-0020-01) organoids were processed for immunoreactivity against the early endosome antigen 1 (EEA1, green) and MAP2 (red). The dotted white line outlines the region of higher magnification to show EEA1 detail. (H) Quantification of EEA1 immunoreactivity in fAD and Ctrl organoids following 90d culture. EEA1 Particle Counts: one-way ANOVA with post-hoc Fisher’s LSD test for multiple comparisons; <i>F</i> (3,16) = 4.0, *p = 0.026, R² = 0.43. EEA1 Particle size: unpaired two-tailed t-test with Welch’s correction: *p = 0.041. (I) Organoids from Ctrl and fAD lines were subjected to the transferrin endocytosis assay to label pools of clathrin-coated early endosomes. (Each data point represent one organoid) Quantification of the average size of transferrin-positive particles: unpaired two-tailed t-test with equal variance, **p = 0.005. Average number (count) of transferrin-positive particles, unpaired two-tailed t-test with equal variance, p = 0.64. On charts: *p < 0.05, **p < 0.01, ***p < 0.001.</p

Organoids created from AD patient iPSCs respond to compound treatment.

<p>(A) Schematic of beta (BACE-1) and gamma (Comp-E) secretase inhibitor treatment (top). At 30 days of culture, fAD (<i>APP</i>^Dp1-1) organoids were treated with low dose (BACE-1, 1μM and Comp-E, 3nM) or high dose (BACE-1, 5 μM and Comp-E 6nM) combined compounds, or equivalent DMSO vehicle. Following 30 or 60 days of culture and drug treatment, organoids at 60 and 90 days of culture, respectively, were processed for immunohistochemistry (IHC). Tissue sections from fAD (<i>APP</i>^Dp1-1) and control (Ctrl; CS-0020-01) organoids were processed for immunoreactivity against Aβ (D45D2, white), pTau (Ser396, green), and MAP2 (red). Examine images are from 90 day organoids. (B) Quantification of Aβ particle number and size in compound treated and fAD organoids following 30 days of administration. Number of Aβ-positive aggregates in two size classes (Particle Counts): one-way ANOVA with Fishers LSD test for multiple comparisons; <i>F</i> (5,24) = 3.58, *p = 0.014, R² = 0.4296. Particle size: one-way ANOVA with Kruskal-Wallis test for non-normal distribution (α < 0.05), p = 0.475. (C) Quantification of Aβ particle number and size in treated (high dose) and untreated fAD organoids following 60 days of compound administration. Number of Aβ-positive aggregates in three size classes (Particle Counts): one-way ANOVA with Fishers LSD test for multiple comparisons; <i>F</i> (5,19) = 5.02, **p = 0.004, R² = 0.5691. Particle size: Mann-Whitney two-tailed test for non-normal distribution (α < 0.05), p = 0.09. (D) Quantification of the average intensity of pTau Ser396 immunoreactivity as a fold change of Ctrl in fAD organoids following 30 and 60 days of compound treatment. 30 day treatment. (Each data point represent one organoid). Unpaired two-tailed t-test with equal variance, p = 0.69. 60 day treatment: one-way ANOVA with Tukey’s multiple comparisons test, F (2,13) = 19.82, ***p = 0.0001, R² = 0.7530. On charts: *p < 0.05, **p < 0.01, ***p < 0.001.</p