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Abstract

Introduction

Protocol

Representative Results

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Acknowledgements

Materials

References

Biology

Single-Cell Sorting of Immunophenotyped Mesenchymal Stem Cells from Human Exfoliated Deciduous Teeth

Published: November 10th, 2023

DOI:

10.3791/65723

1Manipal Institute of Regenerative Medicine, Bengaluru, Manipal Academy of Higher Education, Manipal, 2HIV-AIDS Laboratory, Molecular Biology and Genetics Unit, Jawaharlal Nehru Centre for Advanced Scientific Research (JNCASR)
* These authors contributed equally

This protocol describes the use of fluorescence-activated cell sorting of human mesenchymal stem cells using the single-cell sorting method. Specifically, the use of single-cell sorting can achieve 99% purity of the immunophenotyped cells from a heterogeneous population when combined with a multiparametric flow cytometry-based approach.

The mesenchymal stem cells (MSCs) of an organism possess an extraordinary capacity to differentiate into multiple lineages of adult cells in the body and are known for their immunomodulatory and anti-inflammatory properties. The use of these stem cells is a boon to the field of regenerative biology, but at the same time, a bane to regenerative medicine and therapeutics owing to the multiple cellular ambiguities associated with them. These ambiguities may arise from the diversity in the source of these stem cells and from their in vitro growth conditions, both of which reflect upon their functional heterogeneity.

This warrants methodologies to provide purified, homogeneous populations of MSCs for therapeutic applications. Advances in the field of flow cytometry have enabled the detection of single-cell populations using a multiparametric approach. This protocol outlines a way to identify and purify stem cells from human exfoliated deciduous teeth (SHEDs) through fluorescence-assisted single-cell sorting. Simultaneous expression of surface markers, namely, CD90-fluorescein isothiocyanate (FITC), CD73-peridinin-chlorophyll-protein (PerCP-Cy5.5), CD105-allophycocyanin (APC), and CD44-V450, identified the "bright," positive-expressors of MSCs using multiparametric flow cytometry. However, a significant drop was observed in percentages of quadruple expressors of these positive markers from passage 7 onwards to the later passages.

The immunophenotyped subpopulations were sorted using the single-cell sort mode where only two positive and one negative marker constituted the inclusion criteria. This methodology ensured the cell viability of the sorted populations and maintained cell proliferation post sorting. The downstream application for such sorting can be used to evaluate lineage-specific differentiation for the gated subpopulations. This approach can be applied to other single-cell systems to improve isolation conditions and for acquiring multiple cell surface marker information.

Mesenchymal stem cells (MSCs) can be regarded as a scalable source of cells suitable for cell-based therapies and may be considered a gold standard system in regenerative medicine. These cells can be isolated from a variety of sources in the body with different tissue origins1. Depending on their source tissue, each type of MSC displays an ambiguous in vitro behavior2. This is well observed in their morphological and functional properties3. Multiple studies have shown intra-clonal variation in dimensions, including adult tissue differentiation, genomic state, and metabolic and cellular ar....

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Ethics approval and consent to participate: Human exfoliated deciduous dental pulp samples were received after obtaining informed consent and full ethical approval by Sri Rajiv Gandhi Dental College and Hospital (SRGCDS) Oral and Maxillofacial Department, Bengaluru, in accordance with the standards established by the Hospital Ethical Clearance Committee, SRGCDS. Following which isolation, culture, maintenance, and application of SHEDs were approved by and in compliance with the guidelines recommended by the Institut.......

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The SHEDs were characterized with standard immunofluorescence assays showing the expression of vimentin (red, type III intermediate filaments), actin filaments (Alexa fluor 488 Phalloidin Probes), and nuclei stained with DAPI (Figure 1A). To estimate their proliferative and colony-forming capacities, standard short-term cell growth assays were performed. A 14.3-fold increase in proliferation rate from day 2 to day 8 has been shown in Figure 1B. The clonogenic pr.......

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In the field of tissue engineering and regenerative medicine, among the postnatal sources, oral tissue-derived MSCs have attracted profound interest because of their minimal ethical obligations and notable multilineage differentiation potential21. Dental pulp stem cells (DPSCs) from the impacted third molar and SHEDs have garnered the most attention among dental MSCs for their therapeutic potential in neurodegenerative and traumatic diseases22. The protocol described in thi.......

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We thank the Flow Cell Facility at Jawaharlal Nehru Centre for Advanced Scientific Research, Bengaluru, India, for the use of the flow cytometry core facility. The cryo-sectioning of the pellet culture of differentiated cells was performed at Neuberg Anand Reference Laboratory, Bengaluru, India. This work was supported by UC's intramural funding from the Manipal Academy of Higher Education (MAHE), India. AG is grateful for the support of the Dr. T. M. A. Pai Scholarship from MAHE.

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NameCompanyCatalog NumberComments
Alcian Blue StainHiMediaCCK029-1KT
Antibiotic-Antimycotic (100x) Gibco by ThermoFisher15240062
BD CompBead Plus Anti-Mouse Ig, κ/Negative Control (BSA) Compensation Plus (7.5 µm) Particles SetBD Biosciences560497
BD FACS Accudrop Beads BD Biosciences345249Used to set up the Laser delay when the sort module opens.
BD FACS Aria Fusion Flow cytometerBD Biosciences---
BD FACS Diva 9.4BD Biosciences---
BD FACS Sheath FluidBD Biosciences342003Used as sheath fluid for both analysis and sorting experiments in the BD FACSAria Fusion
BD FACSDiva CS&T Research BeadsBD Biosciences655050Used for Instrument configuration depending on the nozzle size.
BD Horizon V450 Mouse Anti-Human CD44BD Biosciences561292
BD Horizon V450 Mouse IgG2b, κ Isotype ControlBD Biosciences560374CD44-V450 isotype
BD Pharmingen APC Mouse Anti-Human CD105BD Biosciences562408
BD Pharmingen APC Mouse IgG1, κ Isotype ControlBD Biosciences555751CD105-APC isotype
BD Pharmingen DAPI SolutionBD Biosciences564907DAPI Stock solution of 1 mg/mL
BD Pharmingen FITC Mouse Anti-Human CD90BD Biosciences555595
BD Pharmingen FITC Mouse IgG1, κ Isotype ControlBD Biosciences555748CD90-FITC isotype
BD Pharmingen PE Mouse Anti-Human CD45BD Biosciences555483
BD Pharmingen PE Mouse IgG1, κ Isotype ControlBD Biosciences555749CD45-PE isotype
BD Pharmingen PerCP-Cy 5.5 Mouse Anti-Human CD73BD Biosciences561260
BD Pharmingen PerCP-Cy 5.5 Mouse IgG1, κ Isotype ControlBD Biosciences550795CD73-PerCP-Cy 5.5 isotype
BD Pharmingen Purified Mouse Anti-VimentinBD Biosciences550513
Bovine serum albuminHi-Media TC548-5G
Crystal violetNice chemical pvt ltd C33809
Dulbecco's Phosphate Buffered SalineSigma-aldrich  D5652-50LdPBS used for culture work and maintenance. 
Ethanol ------Used for general sterlization.
Fetal Bovine Serum Gibco by ThermoFisher 10270-106
Goat anti-Mouse IgG (H+L) Cross-Adsorbed Secondary Antibody, Alexa Fluor 555ThermoFisher Scientific A-21422
KO-DMEMGibco by ThermoFisher 10829018Basal medium for undifferentiated hESCs, used in the preparation of culture media
L-Glutamine 200mM (100x)Gibco by ThermoFisher25030-081
Methanol, for Molecular Biology Hi-Media MB113
Oil red OHiMedia CCK013-1KT
Paraformaldehyde loba chemie30525-89-4
Penicillin Streptomycin (100x)Gibco by ThermoFisher 15140- 122
Phalloidin (ActinGreen 488 ReadyProbes reagent)Invitrogen R37110
Silver NitrateHiMedia MB156-25G
Sodium Thiosulphate pentahydrateChemport10102-17-7
Sphero Rainbow Fluorescent Particles, 3.0 - 3.4 µmBD Biosciences556291
Staining buffer Prepared in MIRM ----It was prepared using 2% FBS in PBS 
StemPro Adipogenesis Differentiation Basal Media Gibco by ThermoFisher A10410-01Basal media for Adipogenic media
StemPro Adipogenesis SupplementGibco by ThermoFisher A10065-01Induction media for Adipogenic media
StemPro Chondrogenesis SupplementGibco by ThermoFisher A10064-01Induction media for Chondrogenic media
StemPro Osteogenesis SupplementGibco by ThermoFisher A10066-01Induction media for Osteoogenic media
StemPro Osteogenesis/Chondrogenesis Differentiation Basal Media Gibco by ThermoFisher A10069-01Basal media for both Ostegenic and Chondrogenic media
Triton-X-100Hi-Media MB031
Trypan Blue Gibco by life technologies 15250-061
Trypsin - EDTA Solution 1xHi-media TCL049
Tween-20 MERCK 9005-64-5

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