Journal: bioRxiv
Article Title: Growth Factor-Based Manufacturing of Human Pluripotent Stem Cell-Derived Cardiomyocytes Using the Vertical Wheel Bioreactor System
doi: 10.1101/2025.09.07.674777
Figure Lengend Snippet: A) Schematic of the protocols used to produce either ventricular CMs or atrial CMs. The ventricular differentiation protocol (referred to as 10B:6A) involves mesoderm induction with 10 ng/mL BMP4 and 6 ng/mL activin A from days 1-3, while the atrial protocol (referred to as 4B:2A) involves mesoderm induction using 4 ng/mL BMP4 and 2ng/mL activin A as well as addition of 0.5 µM retinoic acid (RA) from day 3-5. Cells were assessed for mesoderm induction efficiency using PDGFRα and CD56 on day 3. On day 4, ALDH activity and CD235a expression were used to identify second heart field (SHF) and first heart field (FHF) populations. B) Representative mesoderm profile at day 3 and C) day 4 of the differentiation protocol. D) Representative images of aggregate morphology on days 6 and 12 following differentiation with either the ventricular or atrial protocol. E) Representative flow cytometry plots for pan-cardiac marker cTnT and ventricular marker MLC2v in day 20 cultures generated with each differentiation protocol. Quantification of the percentage of cells in each condition expressing F) cTnT + , G) MLC2v, and H) MLC2a. I) Expression of ventricular or atrial genes at day 20 of differentiation. *p<0.05 by two-tailed Student’s t-test.
Article Snippet: To assess hPSC-CM purity, hPSC-CMs were fixed with 4% (w/v) paraformaldehyde (PFA) for 10 minutes, permeabilized with ice-cold 90% methanol for 20 minutes, and stained with primary antibodies against cardiac troponin T (cTnT, Miltenyi Biotec), myosin light chain-2v (MLC2v, Miltenyi Biotec), and myosin light chain-2a (MLC2a, Miltenyi Biotec) for 30 minutes at room temperature.
Techniques: Activity Assay, Expressing, Flow Cytometry, Marker, Generated, Two Tailed Test