1
|
Zheng H, Harcum SW, Pei J, Xie W. Stochastic biological system-of-systems modelling for iPSC culture. Commun Biol 2024; 7:39. [PMID: 38191636 PMCID: PMC10774284 DOI: 10.1038/s42003-023-05653-w] [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: 07/29/2023] [Accepted: 11/30/2023] [Indexed: 01/10/2024] Open
Abstract
Large-scale manufacturing of induced pluripotent stem cells (iPSCs) is essential for cell therapies and regenerative medicines. Yet, iPSCs form large cell aggregates in suspension bioreactors, resulting in insufficient nutrient supply and extra metabolic waste build-up for the cells located at the core. Since subtle changes in micro-environment can lead to a heterogeneous cell population, a novel Biological System-of-Systems (Bio-SoS) framework is proposed to model cell-to-cell interactions, spatial and metabolic heterogeneity, and cell response to micro-environmental variation. Building on stochastic metabolic reaction network, aggregation kinetics, and reaction-diffusion mechanisms, the Bio-SoS model characterizes causal interdependencies at individual cell, aggregate, and cell population levels. It has a modular design that enables data integration and improves predictions for different monolayer and aggregate culture processes. In addition, a variance decomposition analysis is derived to quantify the impact of factors (i.e., aggregate size) on cell product health and quality heterogeneity.
Collapse
Affiliation(s)
- Hua Zheng
- Mechanical and Industrial Engineering, Northeastern University, Boston, MA, 02115, USA
| | | | - Jinxiang Pei
- Mechanical and Industrial Engineering, Northeastern University, Boston, MA, 02115, USA
| | - Wei Xie
- Mechanical and Industrial Engineering, Northeastern University, Boston, MA, 02115, USA.
| |
Collapse
|
2
|
Duong TT, Piret JM, Balcarcel RR. A semi‐empirical mathematical model to specify the
pH
of bicarbonate‐buffered cell culture medium formulations. CAN J CHEM ENG 2021. [DOI: 10.1002/cjce.24242] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
Affiliation(s)
- Tam T. Duong
- Bayer U.S. LLC, Pharmaceuticals BD Cell Culture Development Berkeley California USA
- Michael Smith Laboratories, Department of Chemical and Biological Engineering, School of Biomedical Engineering University of British Columbia Vancouver British Columbia Canada
| | - James M. Piret
- Michael Smith Laboratories, Department of Chemical and Biological Engineering, School of Biomedical Engineering University of British Columbia Vancouver British Columbia Canada
| | - R. Robert Balcarcel
- Bayer U.S. LLC, Pharmaceuticals BD Cell Culture Development Berkeley California USA
| |
Collapse
|
3
|
Towards Physiologic Culture Approaches to Improve Standard Cultivation of Mesenchymal Stem Cells. Cells 2021; 10:cells10040886. [PMID: 33924517 PMCID: PMC8069108 DOI: 10.3390/cells10040886] [Citation(s) in RCA: 27] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/23/2021] [Revised: 04/09/2021] [Accepted: 04/12/2021] [Indexed: 02/07/2023] Open
Abstract
Mesenchymal stem cells (MSCs) are of great interest for their use in cell-based therapies due to their multipotent differentiation and immunomodulatory capacities. In consequence of limited numbers following their isolation from the donor tissue, MSCs require extensive expansion performed in traditional 2D cell culture setups to reach adequate amounts for therapeutic use. However, prolonged culture of MSCs in vitro has been shown to decrease their differentiation potential and alter their immunomodulatory properties. For that reason, preservation of these physiological characteristics of MSCs throughout their in vitro culture is essential for improving the efficiency of therapeutic and in vitro modeling applications. With this objective in mind, many studies already investigated certain parameters for enhancing current standard MSC culture protocols with regard to the effects of specific culture media components or culture conditions. Although there is a lot of diversity in the final therapeutic uses of the cells, the primary stage of standard isolation and expansion is imperative. Therefore, we want to review on approaches for optimizing standard MSC culture protocols during this essential primary step of in vitro expansion. The reviewed studies investigate and suggest improvements focused on culture media components (amino acids, ascorbic acid, glucose level, growth factors, lipids, platelet lysate, trace elements, serum, and xenogeneic components) as well as culture conditions and processes (hypoxia, cell seeding, and dissociation during passaging), in order to preserve the MSC phenotype and functionality during the primary phase of in vitro culture.
Collapse
|
4
|
Odenwelder DC, Lu X, Harcum SW. Induced pluripotent stem cells can utilize lactate as a metabolic substrate to support proliferation. Biotechnol Prog 2020; 37:e3090. [PMID: 33029909 DOI: 10.1002/btpr.3090] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/06/2020] [Revised: 09/10/2020] [Accepted: 09/28/2020] [Indexed: 01/07/2023]
Abstract
Human-induced pluripotent stem cells (iPSCs) hold the promise to improve cell-based therapies. Yet, to meet rising demands and become clinically impactful, sufficient high-quality iPSCs in quantity must be generated, a task that exceeds current capabilities. In this study, K3 iPSCs cultures were examined using parallel-labeling metabolic flux analysis (13 C-MFA) to quantify intracellular fluxes at relevant bioprocessing stages: glucose concentrations representative of initial media concentrations and high lactate concentrations representative of fed-batch culture conditions, prior to and after bolus glucose feeds. The glucose and lactate concentrations are also representative of concentrations that might be encountered at different locations within 3D cell aggregates. Furthermore, a novel method was developed to allow the isotopic tracer [U-13 C3 ] lactate to be used in the 13 C-MFA model. The results indicated that high extracellular lactate concentrations decreased glucose consumption and lactate production, while glucose concentrations alone did not affect rates of aerobic glycolysis. Moreover, for the high lactate cultures, lactate was used as a metabolic substrate to support oxidative mitochondrial metabolism. These results demonstrate that iPSCs have metabolic flexibility and possess the capacity to metabolize lactate to support exponential growth, and that high lactate concentrations alone do not adversely impact iPSC proliferation.
Collapse
Affiliation(s)
- Daniel C Odenwelder
- Department of Bioengineering, Clemson University, Clemson, South Carolina, USA
| | - Xiaoming Lu
- Department of Bioengineering, Clemson University, Clemson, South Carolina, USA
- Department of Biomolecular and Chemical Engineering, Clemson University, Clemson, South Carolina, USA
| | - Sarah W Harcum
- Department of Bioengineering, Clemson University, Clemson, South Carolina, USA
| |
Collapse
|
5
|
Lee SP, Chao SC, Chou MF, Huang SF, Dai NT, Wu GJ, Tsai CS, Loh SH, Tsai YT. Characterization of intracellular buffering power in human induced pluripotent stem cells and the loss of pluripotency is delayed by acidic stimulation and increase of NHE1 activity. J Cell Physiol 2020; 236:1515-1528. [PMID: 32841374 DOI: 10.1002/jcp.29959] [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] [Received: 04/21/2020] [Revised: 06/18/2020] [Accepted: 07/07/2020] [Indexed: 11/07/2022]
Abstract
The homeostasis of intracellular pH (pHi ) affects many cellular functions. Our previous study has established a functional and molecular model of the active pHi regulators in human induced pluripotent stem cells (hiPSCs). The aims of the present study were to further quantify passive pHi buffering power (β) and to investigate the effects of extracellular pH and Na+ -H+ exchanger 1 (NHE1) activity on pluripotency in hiPSCs. pHi was detected by microspectrofluorimetry with pH-sensitive dye-BCECF. Western blot, immunofluorescence staining, and flow cytometry were used to detect protein expression and pluripotency. Our study in hiPSCs showed that (a) the value of total (βtot ), intrinsic (βi ), and CO2 -dependent ( β C O 2 ) buffering power all increased while pHi increased; (b) during the spontaneous differentiation for 4 days, the β values of βtot and β C O 2 changed in a tendency of decrease, despite the absence of statistical significance; (c) an acidic cultured environment retained pluripotency and further upregulated expression and activity of NHE1 during spontaneous differentiation; (d) inhibition on NHE1 activity promoted the loss of pluripotency. In conclusion, we, for the first time, established a quantitative model of passive β during differentiation and demonstrated that maintenance of NHE1 at a higher level was of critical importance for pluripotency retention in hiPSCs.
Collapse
Affiliation(s)
- Shiao-Pieng Lee
- Department of Dentistry, School of Dentistry, Division of Oral and Maxillofacial Surgery, Tri-Service General Hospital and National Defense Medical Center, Taipei, Taiwan
| | - Shih-Chi Chao
- Graduate Institute of Life Sciences, National Defense Medical Center, Taipei, Taiwan
| | - Mei-Fang Chou
- Department of Pharmacy Practice, Tri-Service General Hospital, Taipei, Taiwan
| | - Shu-Fu Huang
- Department of Pharmacy Practice, Tri-Service General Hospital, Taipei, Taiwan
| | - Niann-Tzyy Dai
- Department of Surgery, Division of Plastic and Reconstructive Surgery, Tri-Service General Hospital, Taipei, Taiwan
| | - Gwo-Jang Wu
- Department of Obstetrics and Gynecology, Tri-Service General Hospital, Taipei, Taiwan
| | - Chien-Sung Tsai
- Department of Surgery, Division of Cardiovascular Surgery, Tri-Service General Hospital, National Defense Medical Center, Taipei, Taiwan
- Department of Pharmacology, National Defense Medical Center, Taipei, Taiwan
- Institute of Pharmacy, I.M. Sechenov First Moscow State Medical University, Moscow, Russia
| | - Shih-Hurng Loh
- Graduate Institute of Life Sciences, National Defense Medical Center, Taipei, Taiwan
- Department of Pharmacy Practice, Tri-Service General Hospital, Taipei, Taiwan
- Department of Surgery, Division of Cardiovascular Surgery, Tri-Service General Hospital, National Defense Medical Center, Taipei, Taiwan
| | - Yi-Ting Tsai
- Department of Surgery, Division of Cardiovascular Surgery, Tri-Service General Hospital, National Defense Medical Center, Taipei, Taiwan
| |
Collapse
|
6
|
Wu Y, Ding Z, Ren H, Ji M, Yan Y. Preparation, Characterization and In Vitro Biological Evaluation of a Novel Pearl Powder/Poly-Amino Acid Composite as a Potential Substitute for Bone Repair and Reconstruction. Polymers (Basel) 2019; 11:E831. [PMID: 31071963 PMCID: PMC6572604 DOI: 10.3390/polym11050831] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/17/2019] [Revised: 04/18/2019] [Accepted: 05/02/2019] [Indexed: 11/16/2022] Open
Abstract
Many studies about fabricating organic-inorganic composite materials have been carried out in order to mimic the natural structure of bone. Pearl, which has a special block-and-mortar hierarchical structure, is a superior bone repair material with high osteogenic activity, but it shows few applications in the clinical bone repair and reconstruction because of its brittle and uneasily shaped properties. In this work, pearl powder (P)/poly (amino acid) (PAA) composites were successfully prepared by a method of in situ melting polycondensation to combine the high osteogenic activity of the pearl and the pliability of the PAA. The mechanical properties, in vitro bioactivity and biocompatibility as well as osteogenic activity of the composites were investigated. The results showed that P/PAA composites have both good mechanical properties and bioactivity. The compressive strength, bending strength and tensile strength of the composites reached a maximum of 161 MPa, 50 MPa and 42 MPa, respectively; in addition, apatite particles successfully deposited on the composites surface after immersion in simulated body fluid (SBF) for 7 days indicated that P/PAA composites showed an enhanced mineralization capacity and bioactivity due to incorporation of pearl powder and PAA. The cell culture results revealed that higher cell proliferation and better adhesion morphology of mouse bone marrow mesenchymal stem cells (MSCs) appeared on the composite surface. Moreover, cells growing on the surface of the composites exhibited higher alkaline phosphatase (ALP) activity, more calcium nodule-formation, and higher expression levels of osteogenic differentiation-related genes (COL 1, RunX2, OCN, and OPN) than cells grown on PAA surface. The P/PAA composites exhibited both superior mechanical properties to the pearl powder, higher bioactivity and osteogenic capability compared with those of PAA.
Collapse
Affiliation(s)
- Yanan Wu
- College of Physical Science and Technology, Sichuan University, Chengdu 610064, China.
| | - Zhengwen Ding
- College of Physical Science and Technology, Sichuan University, Chengdu 610064, China.
| | - Haohao Ren
- College of Physical Science and Technology, Sichuan University, Chengdu 610064, China.
| | - Mizhi Ji
- College of Physical Science and Technology, Sichuan University, Chengdu 610064, China.
| | - Yonggang Yan
- College of Physical Science and Technology, Sichuan University, Chengdu 610064, China.
| |
Collapse
|
7
|
Nakashima Y, Kounoura M, Malasuk C, Nakakubo K, Watanabe N, Iwata S, Morita K, Oki Y, Kuhara S, Tashiro K, Nakanishi Y. Continuous cell culture monitoring using a compact microplate reader with a silicone optical technology-based spatial filter. THE REVIEW OF SCIENTIFIC INSTRUMENTS 2019; 90:035106. [PMID: 30927768 DOI: 10.1063/1.5054824] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/04/2018] [Accepted: 02/23/2019] [Indexed: 06/09/2023]
Abstract
Continuous cell monitoring is very important for the maintenance and control of cell multiplication and differentiation. This paper presents a compact microplate reader that is able to continuously measure a 24-well microplate (6 × 4 wells) using the optical absorption measurement method. The 24-channel plate reader consisted of a spatial filter, light emitting diode light source, and color sensors and was similarly sized with the cell culture microwell plates. A spatial filter was previously fabricated by our group using silicone optical technology (SOT). This SOT-based spatial filter has an excellent noise reduction effect. Light reflection at the optical path interface can be absorbed and only forward light can be transmitted; accordingly, a larger S/N ratio than that of conventional optical systems is expected. The fabricated 24-channel plate reader permits real-time cell monitoring during cultivation on the clean bench and in cell culture conditions by incorporating the SOT spatial filter. Using the device, it was possible to continuously evaluate the concentration and pH of reagents in the 24 wells in real time. Moreover, cell activity and protein production were detectable using the device. These results suggest that the newly fabricated device is a promising tool for the evaluation of cell behaviors for cell management.
Collapse
Affiliation(s)
- Y Nakashima
- Faculty of Advanced Science and Technology, Kumamoto University, 2-39-1 Kurokami, Chuo-ku, Kumamoto 096-8555, Japan
| | - M Kounoura
- Graduate School of Science and Technology, Kumamoto University, 2-39-1 Kurokami, Chuo-ku, Kumamoto 096-8555, Japan
| | - C Malasuk
- Department of I&E Visionaries, Kyusyu University, 744 Motooka, Nishi-ku, Fukuoka 819-0395, Japan
| | - K Nakakubo
- Department of I&E Visionaries, Kyusyu University, 744 Motooka, Nishi-ku, Fukuoka 819-0395, Japan
| | - N Watanabe
- Graduate School of Bioresource and Bioenvironmental Science, Kyusyu University, 744 Motooka, Nishi-ku, Fukuoka 819-0395, Japan
| | - S Iwata
- Graduate School of Bioresource and Bioenvironmental Science, Kyusyu University, 744 Motooka, Nishi-ku, Fukuoka 819-0395, Japan
| | - K Morita
- Department of I&E Visionaries, Kyusyu University, 744 Motooka, Nishi-ku, Fukuoka 819-0395, Japan
| | - Y Oki
- Department of I&E Visionaries, Kyusyu University, 744 Motooka, Nishi-ku, Fukuoka 819-0395, Japan
| | - S Kuhara
- Faculty of Agriculture, Kyushu University, 744 Motooka, Nishi-ku, Fukuoka 812-8581, Japan
| | - K Tashiro
- Faculty of Agriculture, Kyushu University, 744 Motooka, Nishi-ku, Fukuoka 812-8581, Japan
| | - Y Nakanishi
- Faculty of Advanced Science and Technology, Kumamoto University, 2-39-1 Kurokami, Chuo-ku, Kumamoto 096-8555, Japan
| |
Collapse
|
8
|
Chao SC, Wu GJ, Huang SF, Dai NT, Huang HK, Chou MF, Tsai YT, Lee SP, Loh SH. Functional and molecular mechanism of intracellular pH regulation in human inducible pluripotent stem cells. World J Stem Cells 2018; 10:196-211. [PMID: 30613313 PMCID: PMC6306555 DOI: 10.4252/wjsc.v10.i12.196] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/17/2018] [Revised: 11/14/2018] [Accepted: 12/05/2018] [Indexed: 02/06/2023] Open
Abstract
AIM To establish a functional and molecular model of the intracellular pH (pHi) regulatory mechanism in human induced pluripotent stem cells (hiPSCs).
METHODS hiPSCs (HPS0077) were kindly provided by Dr. Dai from the Tri-Service General Hospital (IRB No. B-106-09). Changes in the pHi were detected either by microspectrofluorimetry or by a multimode reader with a pH-sensitive fluorescent probe, BCECF, and the fluorescent ratio was calibrated by the high K+/nigericin method. NH4Cl and Na-acetate prepulse techniques were used to induce rapid intracellular acidosis and alkalization, respectively. The buffering power (β) was calculated from the ΔpHi induced by perfusing different concentrations of (NH4)2SO4. Western blot techniques and immunocytochemistry staining were used to detect the protein expression of pHi regulators and pluripotency markers.
RESULTS In this study, our results indicated that (1) the steady-state pHi value was found to be 7.5 ± 0.01 (n = 20) and 7.68 ± 0.01 (n =20) in HEPES and 5% CO2/HCO3--buffered systems, respectively, which were much greater than that in normal adult cells (7.2); (2) in a CO2/HCO3--buffered system, the values of total intracellular buffering power (β) can be described by the following equation: βtot = 107.79 (pHi)2 - 1522.2 (pHi) + 5396.9 (correlation coefficient R2 = 0.85), in the estimated pHi range of 7.1-8.0; (3) the Na+/H+ exchanger (NHE) and the Na+/HCO3- cotransporter (NBC) were found to be functionally activated for acid extrusion for pHi values less than 7.5 and 7.68, respectively; (4) V-ATPase and some other unknown Na+-independent acid extruder(s) could only be functionally detected for pHi values less than 7.1; (5) the Cl-/ OH- exchanger (CHE) and the Cl-/HCO3- anion exchanger (AE) were found to be responsible for the weakening of intracellular proton loading; (6) besides the CHE and the AE, a Cl--independent acid loading mechanism was functionally identified; and (7) in hiPSCs, a strong positive correlation was observed between the loss of pluripotency and the weakening of the intracellular acid extrusion mechanism, which included a decrease in the steady-state pHi value and diminished the functional activity and protein expression of the NHE and the NBC.
CONCLUSION For the first time, we established a functional and molecular model of a pHi regulatory mechanism and demonstrated its strong positive correlation with hiPSC pluripotency.
Collapse
Affiliation(s)
- Shih-Chi Chao
- Graduate Institute of Life Sciences, National Defense Medical Center, Taipei 11490, Taiwan
| | - Gwo-Jang Wu
- Department of Obstetrics and Gynecology, Tri-Service General Hospital, National Defense Medical Center, Taipei 11490, Taiwan
| | - Shu-Fu Huang
- Department of Pharmacy Practice, Tri-Service General Hospital, National Defense Medical Center, Taipei 11490, Taiwan
| | - Niann-Tzyy Dai
- Division of Plastic and Reconstructive Surgery, Department of Surgery, Tri-Service General Hospital, National Defense Medical Center, Taipei 11490, Taiwan
| | - Hsu-Kai Huang
- Division of Chest Surgery, Department of Surgery, Tri-Service General Hospital, National Defense Medical Center, Taipei 11490, Taiwan
| | - Mei-Fang Chou
- Department of Pharmacy Practice, Tri-Service General Hospital, National Defense Medical Center, Taipei 11490, Taiwan
| | - Yi-Ting Tsai
- Graduate Institute of Medical Sciences, National Defense Medical Center, Taipei 11490, Taiwan
- Division of Cardiovascular Surgery, Department of Surgery, Tri-Service General Hospital, National Defense Medical Center, Taipei 11490, Taiwan
| | - Shiao-Pieng Lee
- Division of Oral and Maxillofacial Surgery, Department of Dentistry, School of Dentistry, Tri-Service General Hospital and National Defense Medical Center, Taipei 11490, Taiwan
| | - Shih-Hurng Loh
- Graduate Institute of Life Sciences, National Defense Medical Center, Taipei 11490, Taiwan
- Department of Pharmacy Practice, Tri-Service General Hospital, National Defense Medical Center, Taipei 11490, Taiwan
- Department of Pharmacology, National Defense Medical Center, Taipei 11490, Taiwan
| |
Collapse
|
9
|
Assadollahi V, Fathi F, Abdi M, Khadem Erfan MB, Soleimani F, Banafshi O. Increasing maternal age of blastocyst affects on efficient derivation and behavior of mouse embryonic stem cells. J Cell Biochem 2018; 120:3716-3726. [DOI: 10.1002/jcb.27652] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/14/2018] [Accepted: 08/14/2018] [Indexed: 11/10/2022]
Affiliation(s)
- Vahideh Assadollahi
- Cellular and Molecular Research Center, Research Institute for Health Development, Kurdistan University of Medical Sciences Sanandaj Iran
| | - Fardin Fathi
- Cellular and Molecular Research Center, Research Institute for Health Development, Kurdistan University of Medical Sciences Sanandaj Iran
| | - Mohammad Abdi
- Cellular and Molecular Research Center, Research Institute for Health Development, Kurdistan University of Medical Sciences Sanandaj Iran
| | - Mohamad Bager Khadem Erfan
- Cellular and Molecular Research Center, Research Institute for Health Development, Kurdistan University of Medical Sciences Sanandaj Iran
| | | | - Omid Banafshi
- Cellular and Molecular Research Center, Research Institute for Health Development, Kurdistan University of Medical Sciences Sanandaj Iran
| |
Collapse
|
10
|
Horiguchi I, Urabe Y, Kimura K, Sakai Y. Effects of glucose, lactate and basic FGF as limiting factors on the expansion of human induced pluripotent stem cells. J Biosci Bioeng 2018; 125:111-115. [DOI: 10.1016/j.jbiosc.2017.08.004] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/23/2017] [Revised: 07/26/2017] [Accepted: 08/04/2017] [Indexed: 12/15/2022]
|
11
|
Kropp C, Massai D, Zweigerdt R. Progress and challenges in large-scale expansion of human pluripotent stem cells. Process Biochem 2017. [DOI: 10.1016/j.procbio.2016.09.032] [Citation(s) in RCA: 99] [Impact Index Per Article: 14.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
|
12
|
Hyun SW, Kim BR, Hyun SA, Seo JW. The assessment of electrophysiological activity in human-induced pluripotent stem cell-derived cardiomyocytes exposed to dimethyl sulfoxide and ethanol by manual patch clamp and multi-electrode array system. J Pharmacol Toxicol Methods 2017; 87:93-98. [PMID: 28377112 DOI: 10.1016/j.vascn.2017.03.003] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/30/2016] [Revised: 03/14/2017] [Accepted: 03/31/2017] [Indexed: 12/15/2022]
Abstract
INTRODUCTION Recently, electrophysiological activity has been effectively measured in human-induced pluripotent stem cell-derived cardiomyocytes (hiPSC-CMs) to predict drug-induced arrhythmia. Dimethyl sulfoxide (DMSO) and ethanol have been used as diluting agents in many experiments. However, the maximum DMSO and ethanol concentrations that can be effectively used in the measurement of electrophysiological parameters in hiPSC-CMs-based patch clamp and multi-electrode array (MEA) have not been fully elucidated. METHODS We investigated the effects of varying concentrations of DMSO and ethanol used as diluting agents on several electrophysiological parameters in hiPSC-CMs using patch clamp and MEA. RESULTS Both DMSO and ethanol at concentrations>1% in external solution resulted in osmolality >400mOsmol/kg, but pH was not affected by either agent. Neither DMSO nor ethanol led to cell death at the concentrations examined. However, resting membrane potential, action potential amplitude, action potential duration at 90% and 40%, and corrected field potential duration were decreased significantly at 1% ethanol concentration. DMSO at 1% also significantly decreased the sodium spike amplitude. In addition, the waveform of action potential and field potential was recorded as irregular at 3% concentrations of both DMSO and ethanol. Concentrations of up to 0.3% of either agent did not affect osmolality, pH, cell death, or electrophysiological parameters in hiPSC-CMs. DISCUSSION Our findings suggest that 0.3% is the maximum concentration at which DMSO or ethanol should be used for dilution purposes in hiPSC-CMs-based patch clamp and MEA.
Collapse
Affiliation(s)
- Soo-Wang Hyun
- Research Group for Safety Pharmacology, Korea Institute of Toxicology, KRICT, 34114 Daejeon, Republic of Korea.
| | - Bo-Ram Kim
- Research Group for Safety Pharmacology, Korea Institute of Toxicology, KRICT, 34114 Daejeon, Republic of Korea.
| | - Sung-Ae Hyun
- Research Group for Safety Pharmacology, Korea Institute of Toxicology, KRICT, 34114 Daejeon, Republic of Korea.
| | - Joung-Wook Seo
- Research Group for Safety Pharmacology, Korea Institute of Toxicology, KRICT, 34114 Daejeon, Republic of Korea.
| |
Collapse
|
13
|
Gupta P, Hourigan K, Jadhav S, Bellare J, Verma P. Effect of lactate and pH on mouse pluripotent stem cells: Importance of media analysis. Biochem Eng J 2017. [DOI: 10.1016/j.bej.2016.11.005] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
|
14
|
Wu Y, He G, Zhang Y, Liu Y, Li M, Wang X, Li N, Li K, Zheng G, Zheng Y, Yin Q. Unique antitumor property of the Mg-Ca-Sr alloys with addition of Zn. Sci Rep 2016; 6:21736. [PMID: 26907515 PMCID: PMC4764862 DOI: 10.1038/srep21736] [Citation(s) in RCA: 32] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/03/2015] [Accepted: 01/29/2016] [Indexed: 12/25/2022] Open
Abstract
In clinical practice, tumor recurrence and metastasis after orthopedic prosthesis implantation is an intensely troublesome matter. Therefore, to develop implant materials with antitumor property is extremely necessary and meaningful. Magnesium (Mg) alloys possess superb biocompatibility, mechanical property and biodegradability in orthopedic applications. However, whether they possess antitumor property had seldom been reported. In recent years, it showed that zinc (Zn) not only promote the osteogenic activity but also exhibit good antitumor property. In our present study, Zn was selected as an alloying element for the Mg-1Ca-0.5Sr alloy to develop a multifunctional material with antitumor property. We investigated the influence of the Mg-1Ca-0.5Sr-xZn (x = 0, 2, 4, 6 wt%) alloys extracts on the proliferation rate, cell apoptosis, migration and invasion of the U2OS cell line. Our results show that Zn containing Mg alloys extracts inhibit the cell proliferation by alteration the cell cycle and inducing cell apoptosis via the activation of the mitochondria pathway. The cell migration and invasion property were also suppressed by the activation of MAPK (mitogen-activated protein kinase) pathway. Our work suggests that the Mg-1Ca-0.5Sr-6Zn alloy is expected to be a promising orthopedic implant in osteosarcoma limb-salvage surgery for avoiding tumor recurrence and metastasis.
Collapse
Affiliation(s)
- Yuanhao Wu
- Center for Biomedical Materials and Tissue Engineering, Academy for Advanced Interdisciplinary Studies, Peking University, Beijing 100871, China
| | - Guanping He
- Southern Medical University, Guangzhou 510515, China
- Department of Orthopedics, Guangdong Key Lab of Orthopedic Technology and Implant, Guangzhou General Hospital of Guangzhou Military Command, 111 Liuhua Road, Guangzhou, Guangdong 510010, China
| | - Yu Zhang
- Department of Orthopedics, Guangdong Key Lab of Orthopedic Technology and Implant, Guangzhou General Hospital of Guangzhou Military Command, 111 Liuhua Road, Guangzhou, Guangdong 510010, China
| | - Yang Liu
- Department of Materials Science and Engineering, College of Engineering, Peking University, Beijing 100871, China
| | - Mei Li
- Department of Orthopedics, Guangdong Key Lab of Orthopedic Technology and Implant, Guangzhou General Hospital of Guangzhou Military Command, 111 Liuhua Road, Guangzhou, Guangdong 510010, China
| | - Xiaolan Wang
- Department of Orthopedics, Guangdong Key Lab of Orthopedic Technology and Implant, Guangzhou General Hospital of Guangzhou Military Command, 111 Liuhua Road, Guangzhou, Guangdong 510010, China
| | - Nan Li
- Department of Materials Science and Engineering, College of Engineering, Peking University, Beijing 100871, China
| | - Kang Li
- Southern Medical University, Guangzhou 510515, China
- Department of Orthopedics, Guangdong Key Lab of Orthopedic Technology and Implant, Guangzhou General Hospital of Guangzhou Military Command, 111 Liuhua Road, Guangzhou, Guangdong 510010, China
| | - Guan Zheng
- Southern Medical University, Guangzhou 510515, China
- Department of Orthopedics, Guangdong Key Lab of Orthopedic Technology and Implant, Guangzhou General Hospital of Guangzhou Military Command, 111 Liuhua Road, Guangzhou, Guangdong 510010, China
| | - Yufeng Zheng
- Center for Biomedical Materials and Tissue Engineering, Academy for Advanced Interdisciplinary Studies, Peking University, Beijing 100871, China
- Department of Materials Science and Engineering, College of Engineering, Peking University, Beijing 100871, China
| | - Qingshui Yin
- Southern Medical University, Guangzhou 510515, China
- Department of Orthopedics, Guangdong Key Lab of Orthopedic Technology and Implant, Guangzhou General Hospital of Guangzhou Military Command, 111 Liuhua Road, Guangzhou, Guangdong 510010, China
| |
Collapse
|
15
|
Fan X, Ren H, Luo X, Wang P, Lv G, Yuan H, Li H, Yan Y. Mechanics, degradability, bioactivity, in vitro, and in vivo biocompatibility evaluation of poly(amino acid)/hydroxyapatite/calcium sulfate composite for potential load-bearing bone repair. J Biomater Appl 2015; 30:1261-72. [PMID: 26635202 DOI: 10.1177/0885328215620711] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
A ternary composite of poly(amino acid), hydroxyapatite, and calcium sulfate (PAA/HA/CS) was prepared using in situ melting polycondensation method and evaluated in terms of mechanical strengths, in vitro degradability, bioactivity, as well as in vitro and in vivo biocompatibility. The results showed that the ternary composite exhibited a compressive strength of 147 MPa, a bending strength of 121 MPa, a tensile strength of 122 MPa, and a tensile modulus of 4.6 GPa. After immersion in simulated body fluid, the compressive strength of the composite decreased from 147 to 98 MPa for six weeks and the bending strength decreased from 121 to 75 MPa for eight weeks, and both of them kept stable in the following soaking period. The composite could be slowly degraded with 7.27 wt% loss of initial weight after soaking in phosphate buffered solution for three weeks when started to keep stable weight in the following days. The composite was soaked in simulated body fluid solution and the hydroxyapatite layer, as flower-like granules, formed on the surface of the composite samples, showing good bioactivity. Moreover, it was found that the composite could promote proliferation of MG-63 cells, and the cells with normal phenotype extended and spread well on the composite surface. The implantation of the composite into the ulna of sheep confirmed that the composite was biocompatible and osteoconductive in vivo, and offered the PAA/HA/CS composite promising material for load-bearing bone substitutes for clinical application.
Collapse
Affiliation(s)
- Xiaoxia Fan
- College of Physical Science and Technology, Sichuan University, Chengdu, China
| | - Haohao Ren
- College of Physical Science and Technology, Sichuan University, Chengdu, China
| | - Xiaoman Luo
- Xpand Biotechnology BV, Bilthoven, The Netherlands
| | - Peng Wang
- College of Physical Science and Technology, Sichuan University, Chengdu, China
| | - Guoyu Lv
- College of Physical Science and Technology, Sichuan University, Chengdu, China
| | - Huipin Yuan
- Tissue Regeneration Department, Twente University, Enschede, The Netherlands
| | - Hong Li
- College of Physical Science and Technology, Sichuan University, Chengdu, China
| | - Yonggang Yan
- College of Physical Science and Technology, Sichuan University, Chengdu, China
| |
Collapse
|
16
|
Yao Q, Ye J, Xu Q, Mo A, Gong P. Composite scaffolds of dicalcium phosphate anhydrate /multi-(amino acid) copolymer:in vitrodegradability and osteoblast biocompatibility. JOURNAL OF BIOMATERIALS SCIENCE-POLYMER EDITION 2015; 26:211-23. [DOI: 10.1080/09205063.2014.994946] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
|
17
|
Influence of culture pH on proliferation and cardiac differentiation of murine embryonic stem cells. Biochem Eng J 2014. [DOI: 10.1016/j.bej.2014.05.005] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
|
18
|
Liu N, Li Y, Yang ST. Expansion of embryonic stem cells in suspension and fibrous bed bioreactors. J Biotechnol 2014; 178:54-64. [DOI: 10.1016/j.jbiotec.2014.03.007] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/11/2014] [Revised: 02/14/2014] [Accepted: 03/06/2014] [Indexed: 12/23/2022]
|
19
|
Sart S, Agathos SN, Li Y. Process engineering of stem cell metabolism for large scale expansion and differentiation in bioreactors. Biochem Eng J 2014. [DOI: 10.1016/j.bej.2014.01.005] [Citation(s) in RCA: 32] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
|
20
|
Jyoti S, Tandon S. Hypocapnia leads to enhanced expression of pluripotency and meso-endodermal differentiation genes in mouse embryonic stem cells. Exp Cell Res 2014; 322:389-401. [PMID: 24560741 DOI: 10.1016/j.yexcr.2014.02.008] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/30/2013] [Revised: 01/15/2014] [Accepted: 02/07/2014] [Indexed: 11/18/2022]
Abstract
The efficient utilization of embryonic stem cells for applications like cell based therapy, transplantation and drug discovery largely depends upon the culturing conditions of these cells. In this report, we have analyzed gene, protein expression and morphological changes of embryonic stem cells when subjected to lowered CO2 levels i.e. hypocapnia. We studied the quantitative expression of pluripotent genes, Oct3/4, Nanog and Sox2 and genes involved in the differentiation to the three lineages, under varying CO2 levels. Enhanced expression of these genes was seen at cultures maintained at 1.5% CO2 as compared to those maintained at 5% CO2. The cells exposed to hypocapnic conditions when subjected to immunocytochemical analysis stained positive for Oct-3/4, Nanog and Sox2 transcription factors. Flow cytometry and western blot further showed that the pluripotent proteins in the 1.5% CO2 maintained cultures have higher levels of expression as compared to the ES cells at 5% CO2. In addition, there was enhanced differentiation particularly towards the mesodermal and endodermal lineages at cultures maintained and differentiated at 1.5% CO2 at all the time periods analyzed i.e. day 10 (5+5d), 12 (5+7d) and day 15 (5+10d). These results, which we feel are the first of their kind, indicate that lowered CO2 levels seem to be preferred for the maintenance of pluripotency and the subsequent differentiation.
Collapse
Affiliation(s)
- Saras Jyoti
- Department of Biotechnology and Bioinformatics, Jaypee University of Information Technology, Waknaghat 173234, India
| | - Simran Tandon
- Department of Biotechnology and Bioinformatics, Jaypee University of Information Technology, Waknaghat 173234, India.
| |
Collapse
|
21
|
Yeo D, Kiparissides A, Cha JM, Aguilar-Gallardo C, Polak JM, Tsiridis E, Pistikopoulos EN, Mantalaris A. Improving embryonic stem cell expansion through the combination of perfusion and Bioprocess model design. PLoS One 2013; 8:e81728. [PMID: 24339957 PMCID: PMC3858261 DOI: 10.1371/journal.pone.0081728] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/10/2013] [Accepted: 10/18/2013] [Indexed: 12/12/2022] Open
Abstract
BACKGROUND High proliferative and differentiation capacity renders embryonic stem cells (ESCs) a promising cell source for tissue engineering and cell-based therapies. Harnessing their potential, however, requires well-designed, efficient and reproducible expansion and differentiation protocols as well as avoiding hazardous by-products, such as teratoma formation. Traditional, standard culture methodologies are fragmented and limited in their fed-batch feeding strategies that afford a sub-optimal environment for cellular metabolism. Herein, we investigate the impact of metabolic stress as a result of inefficient feeding utilizing a novel perfusion bioreactor and a mathematical model to achieve bioprocess improvement. METHODOLOGY/PRINCIPAL FINDINGS To characterize nutritional requirements, the expansion of undifferentiated murine ESCs (mESCs) encapsulated in hydrogels was performed in batch and perfusion cultures using bioreactors. Despite sufficient nutrient and growth factor provision, the accumulation of inhibitory metabolites resulted in the unscheduled differentiation of mESCs and a decline in their cell numbers in the batch cultures. In contrast, perfusion cultures maintained metabolite concentration below toxic levels, resulting in the robust expansion (>16-fold) of high quality 'naïve' mESCs within 4 days. A multi-scale mathematical model describing population segregated growth kinetics, metabolism and the expression of selected pluripotency ('stemness') genes was implemented to maximize information from available experimental data. A global sensitivity analysis (GSA) was employed that identified significant (6/29) model parameters and enabled model validation. Predicting the preferential propagation of undifferentiated ESCs in perfusion culture conditions demonstrates synchrony between theory and experiment. CONCLUSIONS/SIGNIFICANCE The limitations of batch culture highlight the importance of cellular metabolism in maintaining pluripotency, which necessitates the design of suitable ESC bioprocesses. We propose a novel investigational framework that integrates a novel perfusion culture platform (controlled metabolic conditions) with mathematical modeling (information maximization) to enhance ESC bioprocess productivity and facilitate bioprocess optimization.
Collapse
Affiliation(s)
- David Yeo
- Department of Chemical Engineering, Imperial College London, London, United Kingdom
| | | | - Jae Min Cha
- Department of Chemical Engineering, Imperial College London, London, United Kingdom
| | | | - Julia M. Polak
- Department of Chemical Engineering, Imperial College London, London, United Kingdom
| | - Elefterios Tsiridis
- Department of Surgery & Cancer, Imperial College London, London, United Kingdom
| | | | - Athanasios Mantalaris
- Department of Chemical Engineering, Imperial College London, London, United Kingdom
- * E-mail:
| |
Collapse
|
22
|
Liu N, Ouyang A, Li Y, Yang ST. Three-dimensional neural differentiation of embryonic stem cells with ACM induction in microfibrous matrices in bioreactors. Biotechnol Prog 2013; 29:1013-22. [PMID: 23657995 DOI: 10.1002/btpr.1742] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/19/2013] [Revised: 03/17/2013] [Indexed: 12/21/2022]
Abstract
The clinical use of pluripotent stem cell (PSC)-derived neural cells requires an efficient differentiation process for mass production in a bioreactor. Toward this goal, neural differentiation of murine embryonic stem cells (ESCs) in three-dimensional (3D) polyethylene terephthalate microfibrous matrices was investigated in this study. To streamline the process and provide a platform for process integration, the neural differentiation of ESCs was induced with astrocyte-conditioned medium without the formation of embryoid bodies, starting from undifferentiated ESC aggregates expanded in a suspension bioreactor. The 3D neural differentiation was able to generate a complex neural network in the matrices. When compared to 2D differentiation, 3D differentiation in microfibrous matrices resulted in a higher percentage of nestin-positive cells (68% vs. 54%) and upregulated gene expressions of nestin, Nurr1, and tyrosine hydroxylase. High purity of neural differentiation in 3D microfibrous matrix was also demonstrated in a spinner bioreactor with 74% nestin + cells. This study demonstrated the feasibility of a scalable process based on 3D differentiation in microfibrous matrices for the production of ESC-derived neural cells.
Collapse
Affiliation(s)
- Ning Liu
- William G. Lowrie Dept. of Chemical and Biomolecular Engineering, The Ohio State University, Columbus, OH 43210, USA
| | | | | | | |
Collapse
|
23
|
Liu N, Li Y, Yang ST. Microfibrous carriers for integrated expansion and neural differentiation of embryonic stem cells in suspension bioreactor. Biochem Eng J 2013. [DOI: 10.1016/j.bej.2013.03.017] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
|
24
|
Fan X, Zhang T, Zhao Z, Ren H, Zhang Q, Yan Y, Lv G. Preparation and characterization of bacterial cellulose microfiber/goat bone apatite composites for bone repair. J Appl Polym Sci 2012. [DOI: 10.1002/app.38702] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
|
25
|
Azarin SM, Larson EA, Almodóvar-Cruz JM, de Pablo JJ, Palecek SP. Effects of 3D microwell culture on growth kinetics and metabolism of human embryonic stem cells. Biotechnol Appl Biochem 2012; 59:88-96. [PMID: 23586789 PMCID: PMC3628806 DOI: 10.1002/bab.1003] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/08/2011] [Accepted: 01/18/2012] [Indexed: 11/07/2022]
Abstract
Human embryonic stem cells (hESCs) hold potential in the field of tissue engineering, given their capacity for both limitless self-renewal and differentiation to any adult cell type. However, several limitations, including the ability to expand undifferentiated cells and efficiently direct differentiation at scales needed for commercial cell production, prevent realizing the potential of hESCs in tissue engineering. Numerous studies have illustrated that three-dimensional (3D) culture systems provide microenvironmental cues that affect hESC pluripotency and differentiation fates, but little is known about how 3D culture affects cell expansion. Here, we have used a 3D microwell array to model the differences in hESC growth kinetics and metabolism in two-dimensional (2D) versus 3D cultures. Our results demonstrated that 3D microwell culture reduced hESC size and proliferative capacity, and impacted cell cycle dynamics, lengthening the G1 phase and shortening the G2/M phase of the cell cycle. However, glucose and lactate metabolism were similar in 2D and 3D cultures. Elucidating the effects of 3D culture on growth and metabolism of hESCs may facilitate efforts for developing integrated, scalable cell expansion and differentiation processes with these cells.
Collapse
Affiliation(s)
- Samira M Azarin
- Department of Chemical and Biological Engineering, University of Wisconsin-Madison, Madison, WI, USA
| | | | | | | | | |
Collapse
|
26
|
Want AJ, Nienow AW, Hewitt CJ, Coopman K. Large-scale expansion and exploitation of pluripotent stem cells for regenerative medicine purposes: beyond the T flask. Regen Med 2012; 7:71-84. [DOI: 10.2217/rme.11.101] [Citation(s) in RCA: 64] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023] Open
Abstract
Human pluripotent stem cells will likely be a significant part of the regenerative medicine-driven healthcare revolution. In order to realize this potential, culture processes must be standardized, scalable and able to produce clinically relevant cell numbers, whilst maintaining critical biological functionality. This review comprises a broad overview of important bioprocess considerations, referencing the development of biopharmaceutical processes in an effort to learn from current best practice in the field. Particular focus is given to the recent efforts to grow human pluripotent stem cells in microcarrier or aggregate suspension culture, which would allow geometric expansion of productive capacity were it to be fully realized. The potential of these approaches is compared with automation of traditional T-flask culture, which may provide a cost-effective platform for low-dose, low-incidence conditions or autologous therapies. This represents the first step in defining the full extent of the challenges facing bioprocess engineers in the exploitation of large-scale human pluripotent stem cell manufacture.
Collapse
Affiliation(s)
- Andrew J Want
- Centre for Biological Engineering, Department of Chemical Engineering, Loughborough University, Leicestershire, LE11 3TU, UK
| | - Alvin W Nienow
- Centre for Biological Engineering, Department of Chemical Engineering, Loughborough University, Leicestershire, LE11 3TU, UK
- Centre for Bioprocess Engineering, Department of Chemical Engineering, University of Birmingham, B15 2TT, UK
| | - Christopher J Hewitt
- Centre for Biological Engineering, Department of Chemical Engineering, Loughborough University, Leicestershire, LE11 3TU, UK
| | | |
Collapse
|
27
|
Kehoe DE, Jing D, Lock LT, Tzanakakis ES. Scalable stirred-suspension bioreactor culture of human pluripotent stem cells. Tissue Eng Part A 2010; 16:405-21. [PMID: 19739936 DOI: 10.1089/ten.tea.2009.0454] [Citation(s) in RCA: 173] [Impact Index Per Article: 12.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022] Open
Abstract
Advances in stem cell biology have afforded promising results for the generation of various cell types for therapies against devastating diseases. However, a prerequisite for realizing the therapeutic potential of stem cells is the development of bioprocesses for the production of stem cell progeny in quantities that satisfy clinical demands. Recent reports on the expansion and directed differentiation of human embryonic stem cells (hESCs) in scalable stirred-suspension bioreactors (SSBs) demonstrated that large-scale production of therapeutically useful hESC progeny is feasible with current state-of-the-art culture technologies. Stem cells have been cultured in SSBs as aggregates, in microcarrier suspension and after encapsulation. The various modes in which SSBs can be employed for the cultivation of hESCs and human induced pluripotent stem cells (hiPSCs) are described. To that end, this is the first account of hiPSC cultivation in a microcarrier stirred-suspension system. Given that cultured stem cells and their differentiated progeny are the actual products used in tissue engineering and cell therapies, the impact of bioreactor's operating conditions on stem cell self-renewal and commitment should be considered. The effects of variables specific to SSB operation on stem cell physiology are discussed. Finally, major challenges are presented which remain to be addressed before the mainstream use of SSBs for the large-scale culture of hESCs and hiPSCs.
Collapse
Affiliation(s)
- Daniel E Kehoe
- Department of Chemical and Biological Engineering, State University of New York at Buffalo, Buffalo, New York 14260, USA
| | | | | | | |
Collapse
|
28
|
Incorporation of biomaterials in multicellular aggregates modulates pluripotent stem cell differentiation. Biomaterials 2010; 32:48-56. [PMID: 20864164 DOI: 10.1016/j.biomaterials.2010.08.113] [Citation(s) in RCA: 136] [Impact Index Per Article: 9.7] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/24/2010] [Accepted: 08/31/2010] [Indexed: 12/22/2022]
Abstract
Biomaterials are increasingly being used to engineer the biochemical and biophysical properties of the extracellular stem cell microenvironment in order to tailor niche characteristics and direct cell phenotype. To date, stem cell-biomaterial interactions have largely been studied by introducing stem cells into artificial environments, such as 2D cell culture on biomaterial surfaces, encapsulation of cell suspensions within hydrogel materials, or cell seeding on 3D polymeric scaffolds. In this study, microparticles fabricated from different materials, such as agarose, PLGA and gelatin, were stably integrated, in a dose-dependent manner, within aggregates of pluripotent stem cells (PSCs) prior to differentiation as a means to directly examine stem cell-biomaterial interactions in 3D. Interestingly, the presence of the materials within the stem cell aggregates differentially modulated the gene and protein expression patterns of several differentiation markers without adversely affecting cell viability. Microparticle incorporation within 3D stem cell aggregates can control the spatial presentation of extracellular environmental cues (i.e. soluble factors, extracellular matrix and intercellular adhesion molecules) as a means to direct the differentiation of stem cells for tissue engineering and regenerative medicine applications. In addition, these results suggest that the physical presence of microparticles within stem cell aggregates does not compromise PSC differentiation, but in fact the choice of biomaterials can impact the propensity of stem cells to adopt particular differentiated cell phenotypes.
Collapse
|