Parkinson's disease (PD) is characterized by progressive loss of nigral dopaminergic neurons, resulting in disabling motor symptoms. Intracerebral transplantation of stem cell-derived dopaminergic progenitors to replace lost endogenous dopaminergic neurons offers a new potentially restorative therapeutic approach for PD. Here we report the 12-month primary safety end point and interim efficacy outcomes from a phase 1/2, open-label, multicenter trial evaluating STEM-PD, a cryopreserved, off-the-shelf dopaminergic progenitor product derived from human pluripotent stem cells. Eight individuals with moderate PD underwent bilateral intraputaminal transplantation at two escalating doses (n = 4 per cohort), followed by 12 months of immunosuppression. Seven participants completed 12-month follow-up; one participant died from a pulmonary infection. No serious adverse events were attributed to the cell product, no graft-induced dyskinesias were observed and serial magnetic resonance imaging showed no evidence of tumor formation. These findings support the feasibility and favorable safety profile of human pluripotent stem cell-derived dopaminergic progenitor transplantation in this early-phase study, with risks primarily associated with the immunosuppression regimen. Ongoing follow-up to 36 months will further evaluate durability, clinical outcomes and graft function. ClinicalTrials.gov identifier: NCT05635409 .
G. Paul, H. Bjartmarz, A. Kirkeby et al.· Nature Medicine· 1 citation
Among soluble tau biomarkers, tau phosphorylation at position T205 (p-tau205) has been suggested to distinctly emergence across Alzheimer's disease (AD) continuum compared to other p-tau and non-phosphorylated tau forms, and a moderate relationship with both amyloid-β and tau aggregated pathologies. To evaluate this and further expand the characterization of this biomarker, we measured cerebrospinal fluid (CSF) p-tau205 using an in-house developed immunoassay in a total of 2069 samples from the BioFINDER-2 (n = 1364) and BioFINDER-1 (n = 705) cohorts. These two cohorts spanned the full AD continuum and were analyzed to assess cross-sectional and longitudinal associations with imaging and clinical measures. CSF p-tau205 levels were elevated in both biologically and clinically advanced disease stages. In Aβ-positive individuals, baseline p-tau205 levels correlated with Aβ-PET (R² = 0.28), tau-PET (medial temporal: R2 = 0.35, neocortical: R² = 0.29), cortical atrophy (R² = 0.15) and cognition (MMSE, R² = 0.15). Baseline p-tau205 predicted subsequent Aβ accumulation (R² = 0.44) and tau-accumulation measured by PET (R² = 0.33). Longitudinal p-tau205 levels increased more steeply longitudinally in Aβ-positive than Aβ-negative participants (β[95%CI] = 0.16[0.12-0.21], p < 0.001). Longitudinal p-tau205 changes were associated with cortical thinning (R² = 0.32) and cognitive decline (R² ≥ 0.41). When incorporating Aβ42/40, p-tau217 and p-tau205 into a conceptual CSF-based staging model, the final p-tau205-positive stage showed the strongest association with cortical atrophy, cognitive impairment, and risk of progression to dementia (HR = 6.40[4.28-9.59]). These findings support CSF p-tau205 as a biomarker of Alzheimer's disease pathology and progression with potential value for biological staging.
J. Lantero-Rodríguez, S. Janelidze, S. Palmqvist et al.· Molecular Psychiatry· 0 citations
A double-cutoff analysis suggest that scans in the 11 to 26 Centiloid range should be interpreted with caution depending on the context of use, and positivity cutoffs converged around 18 Centiloids (data-driven) and 27 Centiloids (visual reads).
G. Blazhenets, D. Soleimani-Meigooni, Konstantinos Chiotis et al.· Journal of the American Medi...· 5 citations
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