Rapid and Efficient Generation of Neurons from Human Pluripotent Stem Cells in a Multititre Plate Format

Summary

Protocols for neuronal differentiation of pluripotent human stem cells (hPSCs) are often time-consuming and require substantial cell culture skills. Here, we have adapted a small molecule-based differentiation procedure to a multititre plate format, allowing simple, rapid, and efficient generation of human neurons in a controlled manner.

Abstract

Existing protocols for the generation of neurons from human pluripotent stem cells (hPSCs) are often tedious in that they are multistep procedures involving the isolation and expansion of neural precursor cells, prior to terminal differentiation. In comparison to these time-consuming approaches, we have recently found that combined inhibition of three signaling pathways, TGFβ/SMAD2, BMP/SMAD1, and FGF/ERK, promotes rapid induction of neuroectoderm from hPSCs, followed by immediate differentiation into functional neurons. Here, we have adapted our procedure to a novel multititre plate format, to further enhance its reproducibility and to make it compatible with mid-throughput applications. It comprises four days of neuroectoderm formation in floating spheres (embryoid bodies), followed by a further four days of differentiation into neurons under adherent conditions. Most cells obtained with this protocol appear to be bipolar sensory neurons. Moreover, the procedure is highly efficient, does not require particular expert skills, and is based on a simple chemically defined medium with cost-efficient small molecules. Due to these features, the procedure may serve as a useful platform for further functional investigation as well as for cell-based screening approaches requiring human sensory neurons or neurons of any type.

Introduction

hPSCs, comprising embryo-derived human embryonic stem cells (hESCs) and induced pluripotent stem cells (hiPSCs), are pluripotent meaning that they can give rise to various cell lineages in vitro ^1-2. Numerous differentiated cell types have been derived from hESCs to date, supporting the notion that these cells present valuable tools for scientific research and cell-based screening approaches, and hold promise for cell-based therapeutics.

Neuronal differentiation protocols for hESCs are usually complex and time-consuming as they are often based on first inducing overall neural fate, followed by manual isolation of ....

Protocol

1. Preparation of Matrigel-coated Plates and Media

1. Preparation of Matrigel-coated plates Matrigel has been found to be a preferred substrate for the attachment of differentiating EBs and also promotes the efficient outgrowth of neurons from these¹⁰.
   1. Thaw 10 ml of Matrigel overnight on ice.
   2. Next day, dilute the jelly-like Matrigel with two volumes of ice-cold DMEM/F-12 and prepare aliquots of 1 ml in prechilled 15 ml conical tubes which may be stored frozen at -20 °C.
   3. Decide upon a plate format for neuronal differentiation. For instance, as a starting point, we recommend to perform....

Results

In our previous report, in line with many others, EBs from hPSCs could be generated simply by replating aggregates upon routine splitting of hPSCs into low-attachment dishes¹⁰. This usually results in a wide distribution of resulting EB sizes (Figure 1C, top). Another problem resulting from this is that EBs maintained in suspension tend to aggregate with one another, leading to an even higher heterogeneity of EB sizes. To circumvent these problems, we therefore attempted to generate EBs .......

Discussion

Most differentiation protocols involving EB formation from hPSCs, including our previously published procedure¹⁰, are based on manual or enzyme-assisted harvesting of hESCs as aggregates, which inevitably leads to heterogeneity in EB sizes. This fact leads to variability in differentiation efficiency with some cell lines, thereby rendering systematic analyses difficult, in particular at a medium throughput scale. Furthermore, manual dissection is labor-intensive which by itself compromises scalability.

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Materials

List of materials used in this article

Name	Company	Catalog Number	Comments
Matrigel HC	Becton Dickinson	354263	See text for details on handling
DMEM/F-12	Life Technologies	21331-020
Poly(vinyl alcohol)	Sigma	363170	Dissolve at 0.4% in DMEM/F-12 using an ultrasonic waterbath / avoid overheating / can be kept at 4 °C for several weeks
N2 Supplement	Life Technologies	17502-048	100X, store as frozen aliquots
B27 Supplement	Life Technologies	12587-010	50X, store as frozen aliquots
Bovine Serum Albumin	Sigma	A1595	10% = 500X, store as frozen aliquots
L-Glutamine with Penicillin / Streptomycin	PAA	P11-013	Or equivalent
FGF2	Peprotech	100-18B	Dissolve at 10 μg/ml in 0.1% BSA / PBS = 1000X, store as frozen aliquots
ROCK inhibitor Y-27632	abcamBiochemicals	Asc-129	Dissolve at 10 mM in DMSO = 1000X, store as frozen aliquots
PBS	PAA	H15-002	Or equivalent
Accutase	PAA	L11-007
96-well V-bottom plates	Nunc	277143
PD0325901	Axon Medchem	Axon 1408	Dissolve at 0.5mM in DMSO = 1000X, store as frozen aliquots
SB431542	abcamBiochemicals	Asc-163	dissolve at 15 mM in DMSO = 1000X, store as frozen aliquots
Dorsomorphin	Santa Cruz	sc-200689	dissolve at 0.5 mM in DMSO = 1000X, store as frozen aliquots
96-well U-bottom ultra-low attachment plates	Corning	7007
beta-III Tubulin antibody (mouse)	Sigma	T8660	use at 1:1000
beta-III Tubulin antibody (rabbit)	Covance	PRB-435P	use at 1:2000
BRN3A (POU4F1) antibody	Santa Cruz	sc-8429	use at 1:500
Table 1. Specific reagents and equipment.