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Ferreira DB, Gasparoni LM, Bronzeri CF, Paiva KBS. RPLP0/TBP are the most stable reference genes for human dental pulp stem cells under osteogenic differentiation. World J Stem Cells 2024; 16:656-669. [PMID: 38948092 PMCID: PMC11212553 DOI: 10.4252/wjsc.v16.i6.656] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/23/2023] [Revised: 01/23/2024] [Accepted: 04/12/2024] [Indexed: 06/25/2024] Open
Abstract
BACKGROUND Validation of the reference gene (RG) stability during experimental analyses is essential for correct quantitative real-time polymerase chain reaction (RT-qPCR) data normalisation. Commonly, in an unreliable way, several studies use genes involved in essential cellular functions [glyceraldehyde-3-phosphate dehydrogenase (GAPDH), 18S rRNA, and β-actin] without paying attention to whether they are suitable for such experimental conditions or the reason for choosing such genes. Furthermore, such studies use only one gene when Minimum Information for Publication of Quantitative Real-Time PCR Experiments guidelines recommend two or more genes. It impacts the credibility of these studies and causes distortions in the gene expression findings. For tissue engineering, the accuracy of gene expression drives the best experimental or therapeutical approaches. AIM To verify the most stable RG during osteogenic differentiation of human dental pulp stem cells (DPSCs) by RT-qPCR. METHODS We cultivated DPSCs under two conditions: Undifferentiated and osteogenic differentiation, both for 35 d. We evaluated the gene expression of 10 candidates for RGs [ribosomal protein, large, P0 (RPLP0), TATA-binding protein (TBP), GAPDH, actin beta (ACTB), tubulin (TUB), aminolevulinic acid synthase 1 (ALAS1), tyrosine 3-monooxygenase/tryptophan 5-monooxygenase activation protein, zeta (YWHAZ), eukaryotic translational elongation factor 1 alpha (EF1a), succinate dehydrogenase complex, subunit A, flavoprotein (SDHA), and beta-2-microglobulin (B2M)] every 7 d (1, 7, 14, 21, 28, and 35 d) by RT-qPCR. The data were analysed by the four main algorithms, ΔCt method, geNorm, NormFinder, and BestKeeper and ranked by the RefFinder method. We subdivided the samples into eight subgroups. RESULTS All of the data sets from clonogenic and osteogenic samples were analysed using the RefFinder algorithm. The final ranking showed RPLP0/TBP as the two most stable RGs and TUB/B2M as the two least stable RGs. Either the ΔCt method or NormFinder analysis showed TBP/RPLP0 as the two most stable genes. However, geNorm analysis showed RPLP0/EF1α in the first place. These algorithms' two least stable RGs were B2M/GAPDH. For BestKeeper, ALAS1 was ranked as the most stable RG, and SDHA as the least stable RG. The pair RPLP0/TBP was detected in most subgroups as the most stable RGs, following the RefFinfer ranking. CONCLUSION For the first time, we show that RPLP0/TBP are the most stable RGs, whereas TUB/B2M are unstable RGs for long-term osteogenic differentiation of human DPSCs in traditional monolayers.
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Affiliation(s)
- Daniel B Ferreira
- Laboratory of Extracellular Matrix Biology and Cellular Interaction, Department of Anatomy, Institute of Biomedical Sciences, University of São Paulo, São Paulo 05508-000, São Paulo, Brazil
| | - Leticia M Gasparoni
- Laboratory of Extracellular Matrix Biology and Cellular Interaction, Department of Anatomy, Institute of Biomedical Sciences, University of São Paulo, São Paulo 05508-000, São Paulo, Brazil
| | - Cristiane F Bronzeri
- Laboratory of Extracellular Matrix Biology and Cellular Interaction, Department of Anatomy, Institute of Biomedical Sciences, University of São Paulo, São Paulo 05508-000, São Paulo, Brazil
| | - Katiucia B S Paiva
- Laboratory of Extracellular Matrix Biology and Cellular Interaction, Department of Anatomy, Institute of Biomedical Sciences, University of São Paulo, São Paulo 05508-000, São Paulo, Brazil.
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Ferreira DB, Gasparoni LM, Bronzeri CF, Paiva KBS. RPLP0/TBP are the most stable reference genes for human dental pulp stem cells under osteogenic differentiation. World J Stem Cells 2024; 16:655-668. [DOI: 10.4252/wjsc.v16.i6.655] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/23/2023] [Revised: 01/23/2024] [Accepted: 04/12/2024] [Indexed: 06/25/2024] Open
Abstract
BACKGROUND Validation of the reference gene (RG) stability during experimental analyses is essential for correct quantitative real-time polymerase chain reaction (RT-qPCR) data normalisation. Commonly, in an unreliable way, several studies use genes involved in essential cellular functions [glyceraldehyde-3-phosphate dehydrogenase (GAPDH), 18S rRNA, and β-actin] without paying attention to whether they are suitable for such experimental conditions or the reason for choosing such genes. Furthermore, such studies use only one gene when Minimum Information for Publication of Quantitative Real-Time PCR Experiments guidelines recommend two or more genes. It impacts the credibility of these studies and causes distortions in the gene expression findings. For tissue engineering, the accuracy of gene expression drives the best experimental or therapeutical approaches.
AIM To verify the most stable RG during osteogenic differentiation of human dental pulp stem cells (DPSCs) by RT-qPCR.
METHODS We cultivated DPSCs under two conditions: Undifferentiated and osteogenic differentiation, both for 35 d. We evaluated the gene expression of 10 candidates for RGs [ribosomal protein, large, P0 (RPLP0), TATA-binding protein (TBP), GAPDH, actin beta (ACTB), tubulin (TUB), aminolevulinic acid synthase 1 (ALAS1), tyrosine 3-monooxygenase/tryptophan 5-monooxygenase activation protein, zeta (YWHAZ), eukaryotic translational elongation factor 1 alpha (EF1a), succinate dehydrogenase complex, subunit A, flavoprotein (SDHA), and beta-2-microglobulin (B2M)] every 7 d (1, 7, 14, 21, 28, and 35 d) by RT-qPCR. The data were analysed by the four main algorithms, ΔCt method, geNorm, NormFinder, and BestKeeper and ranked by the RefFinder method. We subdivided the samples into eight subgroups.
RESULTS All of the data sets from clonogenic and osteogenic samples were analysed using the RefFinder algorithm. The final ranking showed RPLP0/TBP as the two most stable RGs and TUB/B2M as the two least stable RGs. Either the ΔCt method or NormFinder analysis showed TBP/RPLP0 as the two most stable genes. However, geNorm analysis showed RPLP0/EF1α in the first place. These algorithms’ two least stable RGs were B2M/GAPDH. For BestKeeper, ALAS1 was ranked as the most stable RG, and SDHA as the least stable RG. The pair RPLP0/TBP was detected in most subgroups as the most stable RGs, following the RefFinfer ranking.
CONCLUSION For the first time, we show that RPLP0/TBP are the most stable RGs, whereas TUB/B2M are unstable RGs for long-term osteogenic differentiation of human DPSCs in traditional monolayers.
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Affiliation(s)
- Daniel B Ferreira
- Laboratory of Extracellular Matrix Biology and Cellular Interaction, Department of Anatomy, Institute of Biomedical Sciences, University of São Paulo, São Paulo 05508-000, São Paulo, Brazil
| | - Leticia M Gasparoni
- Laboratory of Extracellular Matrix Biology and Cellular Interaction, Department of Anatomy, Institute of Biomedical Sciences, University of São Paulo, São Paulo 05508-000, São Paulo, Brazil
| | - Cristiane F Bronzeri
- Laboratory of Extracellular Matrix Biology and Cellular Interaction, Department of Anatomy, Institute of Biomedical Sciences, University of São Paulo, São Paulo 05508-000, São Paulo, Brazil
| | - Katiucia B S Paiva
- Laboratory of Extracellular Matrix Biology and Cellular Interaction, Department of Anatomy, Institute of Biomedical Sciences, University of São Paulo, São Paulo 05508-000, São Paulo, Brazil
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Tarapongpun T, Onlamoon N, Tabu K, Chuthapisith S, Taga T. The optimized priming effect of FGF-1 and FGF-2 enhances preadipocyte lineage commitment in human adipose-derived mesenchymal stem cells. Genes Cells 2024; 29:231-253. [PMID: 38253356 DOI: 10.1111/gtc.13095] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/17/2023] [Revised: 12/26/2023] [Accepted: 01/04/2024] [Indexed: 01/24/2024]
Abstract
The cell-assisted lipotransfer technique, integrating adipose-derived mesenchymal stem cells (ADMSCs), has transformed lipofilling, enhancing fat graft viability. However, the multipotent nature of ADMSCs poses challenges. To improve safety and graft vitality and to reduce unwanted lineage differentiation, this study refines the methodology by priming ADMSCs into preadipocytes-unipotent, self-renewing cells. We explored the impact of fibroblast growth factor-1 (FGF-1), fibroblast growth factor-2 (FGF-2), and epidermal growth factor (EGF), either alone or in combination, on primary human ADMSCs during the proliferative phase. FGF-2 emerged as a robust stimulator of cell proliferation, preserving stemness markers, especially when combined with EGF. Conversely, FGF-1, while not significantly affecting cell growth, influenced cell morphology, transitioning cells to a rounded shape with reduced CD34 expression. Furthermore, co-priming with FGF-1 and FGF-2 enhanced adipogenic potential, limiting osteogenic and chondrogenic tendencies, and possibly promoting preadipocyte commitment. These preadipocytes exhibited unique features: rounded morphology, reduced CD34, decreased preadipocyte factor 1 (Pref-1), and elevated C/EBPα and PPARγ, alongside sustained stemness markers (CD73, CD90, CD105). Mechanistically, FGF-1 and FGF-2 activated key adipogenic transcription factors-C/EBPα and PPARγ-while inhibiting GATA3 and Notch3, which are adipogenesis inhibitors. These findings hold the potential to advance innovative strategies for ADMSC-mediated lipofilling procedures.
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Affiliation(s)
- Tanakorn Tarapongpun
- Division of Head Neck and Breast Surgery, Faculty of Medicine Siriraj Hospital, Department of Surgery, Mahidol University, Bangkok, Thailand
- Department of Stem Cell Regulation, Medical Research Institute, Tokyo Medical and Dental University, Tokyo, Japan
| | - Nattawat Onlamoon
- Department of Research, Faculty of Medicine Siriraj Hospital, Siriraj Research Group in Immunobiology and Therapeutic Sciences, Mahidol University, Bangkok, Thailand
| | - Kouichi Tabu
- Department of Stem Cell Regulation, Medical Research Institute, Tokyo Medical and Dental University, Tokyo, Japan
| | - Suebwong Chuthapisith
- Division of Head Neck and Breast Surgery, Faculty of Medicine Siriraj Hospital, Department of Surgery, Mahidol University, Bangkok, Thailand
| | - Tetsuya Taga
- Department of Stem Cell Regulation, Medical Research Institute, Tokyo Medical and Dental University, Tokyo, Japan
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Ragni E, Piccolo S, Taiana M, Visconte C, Grieco G, de Girolamo L. Inflammation and Starvation Affect Housekeeping Gene Stability in Adipose Mesenchymal Stromal Cells. Curr Issues Mol Biol 2024; 46:842-855. [PMID: 38275668 PMCID: PMC10814131 DOI: 10.3390/cimb46010054] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/18/2023] [Revised: 01/12/2024] [Accepted: 01/17/2024] [Indexed: 01/27/2024] Open
Abstract
Due to the scientific success of in vitro and in vivo model studies, the interest in using mesenchymal stromal cells (MSCs) for the treatment of orthopaedic conditions is growing. In the context of osteoarthritis (OA), MSCs, and, in particular, those derived from adipose tissues (ASCs), have found broader access to clinical use as active components of minimally manipulated orthobiologics, as well as clinically expanded cell preparations, or to collect their released factors (secretome) for cell-free approaches. In this regard, while both inflammatory priming and starvation are common strategies used to empower cell potency or collect the secretome, respectively, little is known about the possible influence of these approaches on the stability of housekeeping genes (HKGs) for molecular studies able to fingerprint cell phenotype or potency. In this report, the reliability of five commonly used HKGs (ACTB, B2M, GAPDH, HPRT1 and RPLP0) was tested in ASCs cultured under standard protocol after inflammatory priming or starvation. Gene expression data were computed with four different applets able to rank genes depending on their stability in either single or combined conditions. The obtained final ranking suggests that for each treatment, a specific HKG is needed, and that starvation is the condition with the stronger effect on HKGs' stability and, therefore, reliability. The normalization effect of proper HKGs' use was then validated on three genes involved in OA and whose product is released by ASCs. Overall, data presented herein confirm that the choice of the best HKG has to be carefully considered and that each specific condition has to be tested to identify the most reliable candidate.
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Affiliation(s)
| | | | | | - Caterina Visconte
- Laboratorio di Biotecnologie Applicate all’Ortopedia, IRCCS Istituto Ortopedico Galeazzi, Via Cristina Belgioioso 173, 20157 Milano, Italy; (E.R.); (S.P.); (M.T.); (G.G.); (L.d.G.)
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5
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Xiao J, Li Z, Li X, Lei H, Meng F, Li C. Screening and Identifying Reference Genes for Erythrocyte Production from Cord Blood CD34+ Cells Exposed to Hypoxia. DNA Cell Biol 2024; 43:1-11. [PMID: 38011643 DOI: 10.1089/dna.2023.0201] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2023] Open
Abstract
Cord blood (CB) CD34+ cells have the potential to be used to achieve artificial hematopoiesis because of their ability to expand and differentiate in multiple directions. However, the mechanism and molecular changes underlying such differentiation are still unclear. The differentiation of CB CD34+ cells is generally driven by subtle changes in gene expression. A crucial method for examining gene expression is quantitative real-time polymerase chain reaction, but the accuracy of the results is dependent on the use of reliable reference genes. Here, the transcription levels of 10 novel candidate reference genes (EIF4G2, DYNC1H1, LUC7L3, CD46, POLR1D, WSB1, GAPVD1, HGS, LGALS8, and RBM5) and 8 traditional reference genes (GAPDH, YWHAZ, ACTB, B2MG, TBP, HMBS, PPIA, HPRT1) in CB CD34+ cells under different oxygen concentrations were screened and evaluated by using the geNorm and NormFinder algorithms. Comprehensive analysis conducted by RefFinder online tool showed that TBP (a traditional reference gene) and EIF4G2 (a novel reference gene) had the most stable expression, whereas GAPDH and HMBS were the least suitable reference genes under these conditions. These results may serve as a basis for selecting reference genes with stable expression for more accurate normalization under different oxygen concentration stimulation during CB CD34+ cells differentiation.
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Affiliation(s)
- Jun Xiao
- Department of Blood Transfusion, Air Force Medical Center, Air Force Medical University, Beijing, China
| | - Zhicai Li
- The Fifth School of Clinical Medicine, Anhui Medical University, Hefei, China
| | - Xiaowei Li
- Department of Blood Transfusion, Air Force Medical Center, Air Force Medical University, Beijing, China
| | - Huifen Lei
- Department of Blood Transfusion, Air Force Medical Center, Air Force Medical University, Beijing, China
| | - Fangyuan Meng
- Department of Blood Transfusion, Air Force Medical Center, Air Force Medical University, Beijing, China
| | - Cuiying Li
- Department of Blood Transfusion, Air Force Medical Center, Air Force Medical University, Beijing, China
- The Fifth School of Clinical Medicine, Anhui Medical University, Hefei, China
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6
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Analysis of stability of reference genes for qPCR in bovine preadipocytes during proliferation and differentiation in vitro. Gene X 2022; 830:146502. [PMID: 35483498 DOI: 10.1016/j.gene.2022.146502] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/29/2021] [Revised: 03/08/2022] [Accepted: 04/14/2022] [Indexed: 11/22/2022] Open
Abstract
The stability of internal reference genes is crucial to the reliability of gene expression results using real-time fluorescence quantitative PCR (qRT-PCR). Inappropriate reference genes may lead to inaccurate results or even wrong conclusions. This study aims to identify stable reference genes for analyzing the expression of proliferation-related and differentiation-inducing genes in bovine primary preadipocytes (BPPs) in vitro. In this study, the stability of 16 candidate internal reference genes (GAPDH, ACTB, PPIA, LRP10, HPRT1, YWHAZ, B2M, TBP, EIF3K, RPS9, UXT, 18S rRNA, RPLP0, MARVELD, EMD and RPS15A) for qRT-PCR at proliferation and differentiation stages of BPPs was investigated by three different algorithms (geNorm, NormFinder and BestKeeper). The expression of two marker genes, PCNA and LPL, was used to determine the validity of the candidate reference genes (RGs) at the proliferation and differentiation stages, respectively. The results showed that GAPDH and RPS15A were the most stable RGs in the proliferation of bovine primary preadipocyte, while PPIA was the least stable internal reference gene. RPLP0 and EIF3K were the most stable RGs in the differentiation induction of bovine primary preadipocyte, while GAPDH was the least stable internal reference gene. This study of RGs laid the foundation for subsequent research into the mechanism of proliferation and differentiation of BPPs in vitro using qRT-PCR.
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Levoux J, Lafuste P, Rodriguez AM. Transcriptional analysis of mouse wounds grafted with human mesenchymal stem cells and platelets. STAR Protoc 2021; 2:100650. [PMID: 34278336 PMCID: PMC8261014 DOI: 10.1016/j.xpro.2021.100650] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022] Open
Abstract
Platelet preparations are commonly used in the clinic in combination with mesenchymal stem cells (MSCs) to improve their wound healing capacity and optimize their therapeutic efficacy following their delivery into diseased tissues. To investigate the mechanisms by which platelets enhance the repair properties of MSCs, we detail a protocol using a humanized mouse model for excisional wounds to study by reverse transcription real-time PCR whether human platelets alter the therapeutic efficacy of grafted human MSCs. For complete details on the use and execution of this protocol, please refer to Levoux et al. (2021).
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Affiliation(s)
| | - Peggy Lafuste
- Univ Paris Est Creteil, INSERM, IMRB, 94010 Créteil, France
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Xu L, Gao Z, Yang Z, Qu M, Li H, Chen L, Lv Y, Fan Z, Yue W, Li C, Xie X, Pei X. Evaluation of Reliable Reference Genes for In Vitro Erythrocyte Generation from Cord Blood CD34 + Cells. DNA Cell Biol 2021; 40:1200-1210. [PMID: 34227876 DOI: 10.1089/dna.2021.0185] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Abstract
In vitro generation of red blood cells has the potential to circumvent shortfalls in the global demand for blood for transfusion applications. However, cell differentiation and proliferation are often regulated by precise changes in gene expression, but the underlying mechanisms and molecular changes remain unclear. Quantitative reverse transcription-polymerase chain reaction (qRT-PCR) can be used to evaluate multiple target genes. To make the results more reliable, suitable reference genes should be used to calibrate the error associated with qRT-PCR. In this study, we utilized bioinformatics to screen 3 novel candidate reference genes (calcium and integrin binding family member 2 [CIB2], olfactory receptor family 8 subfamily B member 8 [OR8B8], and zinc finger protein 425 [ZNF425]) along with eight traditional reference genes (glyceraldehyde-3-phosphate dehydrogenase [GAPDH], β-actin [ACTB], 18S RNA, β2-microglobulin [β2-MG], peptidylprolyl isomerase A [PPIA], TATA box-binding protein [TBP], hydroxymethylbilane synthase [HMBS], and hypoxanthine phosphoribosyltransferase 1 [HPRT1]). Two software algorithms (geNorm and NormFinder) were used to evaluate the stability of expression of the 11 genes at different stages of erythrocyte development. Comprehensive analysis showed that expression of GAPDH and TBP was the most stable, whereas ZNF425 and OR8B8 were the least suitable candidate genes. These results suggest that appropriate reference genes should be selected before performing gene expression analysis during erythroid differentiation and that GAPDH and TBP are suitable reference genes for gene expression studies on erythropoiesis.
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Affiliation(s)
- Lei Xu
- Stem Cell and Regenerative Medicine Lab, Institute of Health Service and Transfusion Medicine, Beijing, China.,South China Research Center for Stem Cell & Regenerative Medicine, SCIB, Guangzhou, China
| | - Zhan Gao
- Clinical Medical College of Air Force, Anhui Medical University, Hefei, China.,Air Force Medical Center, PLA, Beijing, China
| | - Zhou Yang
- Stem Cell and Regenerative Medicine Lab, Institute of Health Service and Transfusion Medicine, Beijing, China.,South China Research Center for Stem Cell & Regenerative Medicine, SCIB, Guangzhou, China
| | - Mingyi Qu
- Stem Cell and Regenerative Medicine Lab, Institute of Health Service and Transfusion Medicine, Beijing, China.,South China Research Center for Stem Cell & Regenerative Medicine, SCIB, Guangzhou, China.,Beijing Institute of Radiation Medicine, Beijing, China
| | - Huilin Li
- Stem Cell and Regenerative Medicine Lab, Institute of Health Service and Transfusion Medicine, Beijing, China.,South China Research Center for Stem Cell & Regenerative Medicine, SCIB, Guangzhou, China
| | - Lin Chen
- Stem Cell and Regenerative Medicine Lab, Institute of Health Service and Transfusion Medicine, Beijing, China.,South China Research Center for Stem Cell & Regenerative Medicine, SCIB, Guangzhou, China
| | - Yang Lv
- Stem Cell and Regenerative Medicine Lab, Institute of Health Service and Transfusion Medicine, Beijing, China.,South China Research Center for Stem Cell & Regenerative Medicine, SCIB, Guangzhou, China
| | - Zeng Fan
- Stem Cell and Regenerative Medicine Lab, Institute of Health Service and Transfusion Medicine, Beijing, China.,South China Research Center for Stem Cell & Regenerative Medicine, SCIB, Guangzhou, China
| | - Wen Yue
- Stem Cell and Regenerative Medicine Lab, Institute of Health Service and Transfusion Medicine, Beijing, China.,South China Research Center for Stem Cell & Regenerative Medicine, SCIB, Guangzhou, China
| | - Cuiying Li
- Clinical Medical College of Air Force, Anhui Medical University, Hefei, China.,Air Force Medical Center, PLA, Beijing, China
| | - Xiaoyan Xie
- Stem Cell and Regenerative Medicine Lab, Institute of Health Service and Transfusion Medicine, Beijing, China.,South China Research Center for Stem Cell & Regenerative Medicine, SCIB, Guangzhou, China
| | - Xuetao Pei
- Stem Cell and Regenerative Medicine Lab, Institute of Health Service and Transfusion Medicine, Beijing, China.,South China Research Center for Stem Cell & Regenerative Medicine, SCIB, Guangzhou, China
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Ofiteru AM, Becheru DF, Gharbia S, Balta C, Herman H, Mladin B, Ionita M, Hermenean A, Burns JS. Qualifying Osteogenic Potency Assay Metrics for Human Multipotent Stromal Cells: TGF-β2 a Telling Eligible Biomarker. Cells 2020; 9:E2559. [PMID: 33260388 PMCID: PMC7760953 DOI: 10.3390/cells9122559] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/27/2020] [Revised: 11/18/2020] [Accepted: 11/24/2020] [Indexed: 02/06/2023] Open
Abstract
Potency assays are critical for regenerative medicine, addressing the known challenge of functional heterogeneity among human multipotent stromal cells (hMSC). Necessary laboratory cell expansion allows analysis before implantation in the patient. Levels of induction of five signature gene biomarkers, ALPL, COL1A2, DCN, ELN and RUNX2, constituted a previously reported proof-of-principle osteogenic potency assay. We tested assay modification to enhance reproducibility using six consistent bone marrow derived hBM-MSC and explored applicability to three adipose tissue derived hAT-MSC. Using a potent proprietary osteogenic induction factor, the GUSB/YWAHZ reference gene pair provided real time PCR consistency. The novel assay conditions supported the concept that genes encoding extracellular matrix proteins one week after osteogenic induction were informative. Nonetheless, relatively low induction of COL1A2 and ELN encouraged search for additional biomarkers. TGFB2 mRNA induction, important for osteogenic commitment, was readily quantifiable in both hBM-MSC and hAT-MSC. Combined with DCN, TGFB2 mRNA induction data provided discriminatory power for resolving donor-specific heterogeneity. Histomorphometric decorin and TGF-β2 protein expression patterns in eight-week heterotopic bone implants also discriminated the two non-bone-forming hMSC. We highlight progress towards prompt osteogenic potency assays, needed by current clinical trials to accelerate improved intervention with enhanced stem cell therapy for serious bone fractures.
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Affiliation(s)
- Augustin M. Ofiteru
- Faculty of Medical Engineering, University Politehnica of Bucharest, Gh Polizu 1-7, 011061 Bucharest, Romania; (D.F.B.); (M.I.)
| | - Diana F. Becheru
- Faculty of Medical Engineering, University Politehnica of Bucharest, Gh Polizu 1-7, 011061 Bucharest, Romania; (D.F.B.); (M.I.)
- Faculty of Applied Chemistry and Materials Science, University Politehnica of Bucharest, Gh Polizu 1-7, 011061 Bucharest, Romania
| | - Sami Gharbia
- “Aurel Ardelean” Institute of Life Sciences, Vasile Goldis Western University of Arad, 86 Rebreanu, 310414 Arad, Romania; (S.G.); (C.B.); (H.H.); (B.M.); (A.H.)
| | - Cornel Balta
- “Aurel Ardelean” Institute of Life Sciences, Vasile Goldis Western University of Arad, 86 Rebreanu, 310414 Arad, Romania; (S.G.); (C.B.); (H.H.); (B.M.); (A.H.)
| | - Hildegard Herman
- “Aurel Ardelean” Institute of Life Sciences, Vasile Goldis Western University of Arad, 86 Rebreanu, 310414 Arad, Romania; (S.G.); (C.B.); (H.H.); (B.M.); (A.H.)
| | - Bianca Mladin
- “Aurel Ardelean” Institute of Life Sciences, Vasile Goldis Western University of Arad, 86 Rebreanu, 310414 Arad, Romania; (S.G.); (C.B.); (H.H.); (B.M.); (A.H.)
| | - Mariana Ionita
- Faculty of Medical Engineering, University Politehnica of Bucharest, Gh Polizu 1-7, 011061 Bucharest, Romania; (D.F.B.); (M.I.)
| | - Anca Hermenean
- “Aurel Ardelean” Institute of Life Sciences, Vasile Goldis Western University of Arad, 86 Rebreanu, 310414 Arad, Romania; (S.G.); (C.B.); (H.H.); (B.M.); (A.H.)
| | - Jorge S. Burns
- Faculty of Medical Engineering, University Politehnica of Bucharest, Gh Polizu 1-7, 011061 Bucharest, Romania; (D.F.B.); (M.I.)
- Department of Life Sciences and Biotechnology, University of Ferrara, 44121 Ferrara, Italy
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Validation of Reference Genes for Gene Expression Studies by RT-qPCR in HepaRG Cells during Toxicity Testing and Disease Modelling. Cells 2020; 9:cells9030770. [PMID: 32245194 PMCID: PMC7140694 DOI: 10.3390/cells9030770] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/25/2020] [Revised: 03/17/2020] [Accepted: 03/19/2020] [Indexed: 12/16/2022] Open
Abstract
Gene expression analysis by quantitative real-time polymerase chain reaction (RT-qPCR) is routinely used in biomedical studies. The reproducibility and reliability of the data fundamentally depends on experimental design and data interpretation. Despite the wide application of this assay, there is significant variation in the validation process of gene expression data from research laboratories. Since the validity of results depends on appropriate normalisation, it is crucial to select appropriate reference gene(s), where transcription of the selected gene is unaffected by experimental setting. In this study we have applied geNorm technology to investigate the transcription of 12 ‘housekeeping’ genes for use in the normalisation of RT-qPCR data acquired using a widely accepted HepaRG hepatic cell line in studies examining models of pre-clinical drug testing. geNorm data identified a number of genes unaffected by specific drug treatments and showed that different genes remained invariant in response to different drug treatments, whereas the transcription of ‘classical’ reference genes such as GAPDH (glyceralde- hyde-3-phosphate dehydrogenase) was altered by drug treatment. Comparing data normalised using the reference genes identified by geNorm with normalisation using classical housekeeping genes demonstrated substantial differences in the final results. In light of cell therapy application, RT-qPCR analyses has to be carefully evaluated to accurately interpret data obtained from dynamic cellular models undergoing sequential stages of phenotypic change.
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