International Journal of Current Research and Review
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IJCRR - 4(20), October, 2012

Pages: 89-93

Date of Publication: 20-Oct-2012


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CELL ADHESION MOLECULE EXPRESSION PROFILING OF HUMAN UMBILICAL CORD MATRIX AND ADIPOSE STEM CELLS

Author: S. Indumathi, Rashmi Mishra, R. Harikrishnan, J.S. Rajkumar, Neha Kantawala, M. Dhanasekaran

Category: Healthcare

Abstract:Introduction: The advancements and applications of redundant tissue sources such as human subcutaneous adipose tissue (SF) and human umbilical cord matrix (HUCM) tissue are gaining importance in recent years. Despite these advancements, certain stumbling blocks accounts for lack of functional improvement of the diseased. One major bottleneck for the prevailing failures relies on understanding the migratory and homing potential of stem cells. Cell adhesion molecules have been identified to play a vital role in vascular adhesion, migration, extravasations and ultimately homing. However, significance of cell adhesion molecules in therapeutic implications has not much concentrated upon in recent years unlike mesenchymal stem cells. Objective: The present study showcases the significance of cell adhesion molecules and addresses the major issue on identity of an ideal stem cell source with maximum benefits. Research methodology: To this end, the cells obtained from the human SF and HUCM were cultured until P3 and cultured cells were characterized for comparative expression profile analysis of certain cell adhesion molecules. Outcome of the study: Cultured MSCs derived from both these aforesaid sources exhibited a significant percentage of cell adhesion molecules, thereby substantiating its efficacy on tissue homing and migration. Thus, both the sources were found superior with regards to the expression of CAM and can be clinically exploited. However, umbilical cord matrix serves a better therapeutic option for allogenic transplantation, which is evident from the sparse expression of CD 34 at primary culture itself, thereby opening a gateway to circumvent the surgical complications in clinical transplantations.

Keywords: human umbilical cord matrix, human subcutaneous adipose tissue, stem cells, cell adhesion molecules, flowcytometry.

Full Text:

INTRODUCTION
Topical research directs clinical translation of its findings to assist medication for various diseases and disorders. However, there are bouquets of clinical conditions which are either stiff to treatment or give a sluggish response. Thus, there emerged the replacement therapy which is again hindered by the shortage of donors for the procurement of tissues or organs [1,2]. Thus regenerative medicine became a necessity in healthcare owing to its potency and ability to form any kind of cells. Stem cells possess ultimate and dynamic properties that make themselves a best tool for regenerative medicine and medical therapeutics. Research focus on stem cells and its multilineage potentials isolated from human adipose tissue and cord matrix tissues has been fascinating and gained wide interest in recent years. The rationale behind this is because of the selection of source on the basis of redundancy of tissue availability, allogeneic and autologous nature that suits well for clinical implications. Human subcutaneous adipose tissue, a redundant tissue serves as an inexhaustible source of large quantity of stem cells. Accumulating evidences report on its efficacy on the proliferative potency and plasticity, thereby substantiating its imperativeness in cell based therapies. Recently, large interest relies on using subcutaneous adipose tissue as a cue to cure wide range of diseases [3, 4,5]. In a similar manner, Umbilical cord matrix tissue, which is discarded during delivery, is a potent source of stem cells as no ethical concerns are involved. In addition, the beneficial properties of umbilical cord derived MSCs for instance high proliferation and multitude differentiation potential makes it a significant source [6,7,8]. Reckoning on its clinical application, several preclinical animal models of human disease such as neurodegenerative disease, cancer, diabetes and heart disease have been reported [9,10,11,12]. However, the ability of these cells to migrate, extravagate and ultimately home to the site of injury has not much concentrated upon. It is of prime importance to look into the credentials of homing in tissue specific stem cells, which will pave way for clinical translation. To take these research pursuits to cell based therapy, it is of vital importance to study the innate property of stem cells i.e. homing. Homing stands for the stem cell capture within the vasculature of a tissue followed by transmigration across the endothelium. Potential trafficking of stem cells in-vivo is a strenuous task and hence can be studied in-vitro to develop the cell based curative concepts [13]. Cell adhesion molecules (CAM) play a major role in vascular adhesion, migration, extravasations and ultimately homing of MSCs. Studies showed blocking the CD29 (Integrin-β1) on MSCs led to reduced engraftment in ischemic myocardium. Study also demonstrates that CD44 is instrumental in MSC homing to damaged kidney and in mechanisms governing MSC trafficking [14]. Therefore this study aims at comparing the stem cells derived from human subcutaneous fat and umbilical cord matrix for the expression of cell adhesion molecules (ALCAM, HCAM, Integrin β1, CD90, CD13 and CD34) at passage 0, 1 and 3. MATERIALS AND METHODS Sampling: Human umbilical cord matrix (HUCM) samples and subcutaneous fat tissue were obtained from 3 subjects (n=3) each undergoing delivery or exploratory bariatric surgery at Lifeline multispeciality hospital, Chennai. Sampling and processing procedures were reviewed and approved by hospital ethical committee of Lifeline multi-speciality hospital and all samples were collected upon obtaining written informed consents from patients. The HUCM samples were collected immediately after birth and transported in sterile collection bottles with 0.9% normal saline supplemented with gentamycin and 1% antibiotic-antimycotic solution at 4°C. The clamped cord samples were later transferred to sterile phosphate buffered saline (PBS) for processing. About 70-100g of subcutaneous fat samples were collected and transferred to PBS. All samples were processed with 24 hours of sample collection. Explant culture The cord tissue samples were washed in sterile PBS (without Ca2+ and Mg2+) supplemented with antibiotic-antimycotic solution. The microbial contaminants were further removed by washing the samples with 70% ethanol for 30 seconds. The tissue samples were further washed in PBS and the cord vein as well as arteries was removed with the help of a surgical forceps. The cord tissues so obtained were washed to remove any blood clots and diced into fragments of 2-5mm size. The tissue fragments were placed in 6 well plates (3-4 explants per well) and dried for 10 minutes. The explants were further incubated in growth medium (DMEM-LG supplemented with 15% fetal bovine serum (FBS) and 1% antibiotic solution) at 5% CO2, 95% humidity and 37OC. The plates were left undisturbed to allow the migration of cells from explants and the media were replaced twice every week. The explants were removed after 10 days and the cells were subcultured by trypsin-EDTA method until Passage 3 (P3).

Adipose cell culture: Solid fat tissues were minced and collagenase digested using 0.075% collagenase type-1, upon washing with 1x Phosphate Buffered Saline (PBS). Debris and lipocyte content from digested sample were removed by centrifugation to obtain the Stromal Vascular Fraction (SVF). Erythrocytes in cell fractions were lysed using 0.7% NH4Cl solution. The cells were resuspended and pelleted in PBS. Viability and enumeration was done using Trypan Blue method. 3x105 cells were seeded onto 25cm2 culture flasks (Nunc) and incubated in growth medium (DMEM-LG supplemented with 15% fetal bovine serum (FBS) and 1% antibiotic solution) at 37OC, 5% CO2 and 95% humidity for 2-4 days. The primary cultures were subcultured until passage 3 with media change twice every week. Phenotypic characterization using flowcytometry About 1x105 cells of each sample were phenotypically characterized for the expression of following cell surface markers; ALCAM, H-CAM, Integrin-β1, CD 13, CD 34 and Thy1. The cells were incubated with the antigenic cocktails (Table 1) at room temperature in dark for 20 minutes, washed with BD FACS wash buffer and pelleted by centrifugation. The pellets were resuspended in BD FACS flow and analyzed on the flowcytometer (BD FACS Aria) using BD FACS-Diva software. Statistical Analysis: The expression profile of cell adhesion molecules obtained from subcutaneous fat tissue and umbilical cord matrix tissue samples (n=3) were represented as Mean ± Standard Error Mean (SEM). The data were analysed using two-tailed student t-test and the pvalues were calculated to determine the statistically significant variations. Results were considered statistically significant when p<0.05, p<0.01, p<0.001, p<0.0001. RESULTS Cell Culture: The human umbilical cord matrix (n=3) and subcutaneous adipose tissue (n=3) derived stem cells were isolated and expanded till passage 3 in α-MEM (Alpha- Minimal Essential Media) based on their adherence. The in vitro experiments indicated that MSCs (Mesenchymal Stem Cells) derived from both HUCM (Human Umbilical Cord Matrix) and SF (Subcutaneous Fat) was easily isolated due to plastic adherence. The morphological appearance of the mesenchymal stem cells of these two sources were initially round epithelial in nature with a transition of long spindle shaped fibroblastic morphology at P1 (Passage 1) onwards (Fig.1). Phenotypic expression We examined the expression of ALCAM (Activated Leukocyte Cell Adhesion Molecule) (CD166), Integrin β1 (CD29) and H-CAM (Hyluronate Cell Adhesion Molecule) (CD44), CD90 (Cluster of Differentiation 90), CD13, CD34 at passage 0, 1 and 3 by flowcytometry. The dot plot output of the flowcytometric analysis of the markers was illustrated (Fig.2). The comparison of surface antigenic expression profiles of cell adhesion molecules of these sources were comprehended in the form of Mean ± SEM (Standard Error Mean) and estimated p value symbolized evidence of significant variations among the expressions of HUCM and SF samples (Table 2). The MSCs derived from HUCM and SF shared a consistent positivity of Cell adhesion molecules, ALCAM (CD166), Integrin β1 (CD29) and H-CAM (CD44). The expression of the defined MSC as well as cell adhesion molecule marker CD90 was found to possess a remarkable expression of greater than 90%. Similarly, both the sources showed a constant positive expression for surface enzyme CD13 from passage 0 to passage 3. On the contrary, a marked variation was obtained in the expression profile of CD 34 positivity in MSCs derived from either of the sources. Interestingly, CD34 was found to be negligible in HUCM right from passage 0 opposite to the expression identified in SF (Fig.3), indicating imperativeness of HUCM in allogenic transplantation.

DISCUSSION In the present research pursuit, we focus to showcase MSCs intriguing property of homing which makes them a strong candidate for cellbased therapy against various human diseases. MSC homing results in migration of stem cells to injured tissues, where they can encourage the survival of damaged cells by inhibiting the release of proinflammatory cytokines. MSC homing being a clinically relevant process has to be addressed in context to its most suitable sources. However, in vivo studies for mobilization of endogenous or exogenous MSCs are a strenuous task. Hence in vitro studies can be drawn to evaluate the MSCs on terms of their homing ability thereby providing an insight on its therapeutic potential. As the exact mechanism of MSC homing is still unearth, this is an attempt to correlate the concepts underlined in existing literature to the results we have arrived at. Literature reports MSC homing can be active by means of leukocyte-like cell-adhesion and transmigration mechanisms [15]. In lieu of the above, we propose to fabricate in vitro study on Human umbilical cord matrix (HUCM) and subcutaneous adipose tissue (SF) derived MSCs for expression of certain ALCAM (CD166), Integrin β1 (CD29) and H-CAM (CD44), CD90, CD13, CD34 by flowcytometry. Integrin β1 (CD29) was found to be more than 90 % for both HUCM and SF at all culture time points under study. Literature reports that upregulation of VLA-4 β1integrin on MSCs prompt 10 folds increase in homing ability to bone marrow [16], thus a remarkable expression of Integrin β1 supports homing ability in both tissue sources. Another important cell adhesion molecule H-CAM (CD44) expressed remarkably (more than 90%) which can be related to a study stating CD44 negative MSC were unable to localize within the injured kidney and failed to accelerate morphological and functional recovery in contrast to CD44 positive MSCs [14]. Similarly, remarkable expression (< 90%) of ALCAM (CD166) also ropes to the homing property of MSC. CD90, ISCT defined MSC marker as well as CAM was also expressed in coherence with the literature as remarkable [17]. CD13, a surface enzyme was found deliberated to mimic action of a CAM and was highly expressed in MSCs from bone marrow and adipose tissue [18]. Likewise, CD13 showed remarkable expression for SF as well as HUCM. It is indicative from the results that both HUCM and SF equally possesses remarkable expressions of cell adhesion molecules, representative of an intriguing property of homing which makes them a strong candidate for cell-based therapy. On the other hand, negligible expressions of CD 34 in HUCM when compared to SF, indicates the MSC homogeneity of HUCM and its utilization for allogenic transplantation as well when compared to SF.

CONCLUSION T
o conclude, this study augments in understanding homing property of tissue specific MSCs. Hence, this study will presumably prove beneficial to assess its therapeutic competence. Overall, this study accounts proof for trafficking behaviour of HUCM and SF derived MSCs and their probable positive role in regulating wound healing and inflammatory diseases due to homing action.

ACKNOWLEDGEMENT
The authors thank the surgeons and theatre staffs at Lifeline Multispeciality Hospital in Chennai for assisting in sampling. The authors acknowledge the immense help received from the scholars whose articles are cited and included in references of this manuscript. The authors are also grateful to authors/ editors/ publishers of all those articles, journals and books from where the literature for this article has been reviewed and discussed. They also extend thanks to patients for donating and providing umbilical cord and adipose tissue for our study.

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14. Herrera M B, Bussolati B, Bruno S, Morando L, Mauriello-Romanazzi G, Sanavio F, Stamenkovic I, Biancone L, Camussi G (2007) Exogenous mesenchymal stem cells localize to the kidney by means of CD44 following acute tubular injury. Kidney International 72:430–441

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A Study by Juna Byun et al. entitled "Study on Difference in Coronavirus-19 Related Anxiety between Face-to-face and Non-face-to-face Classes among University Students in South Korea" is awarded Best Article for Vol 12 issue 16
A Study by Sudha Ramachandra & Vinay Chavan entitled "Enhanced-Hybrid-Age Layered Population Structure (E-Hybrid-ALPS): A Genetic Algorithm with Adaptive Crossover for Molecular Docking Studies of Drug Discovery Process" is awarded Best article for Vol 12 issue 15
A Study by Varsha M. Shindhe et al. entitled "A Study on Effect of Smokeless Tobacco on Pulmonary Function Tests in Class IV Workers of USM-KLE (Universiti Sains Malaysia-Karnataka Lingayat Education Society) International Medical Programme, Belagavi" is awarded Best article of Vol 12 issue 14, July 2020
A study by Amruta Choudhary et al. entitled "Family Planning Knowledge, Attitude and Practice Among Women of Reproductive Age from Rural Area of Central India" is awarded Best Article for special issue "Modern Therapeutics Applications"
A study by Raunak Das entitled "Study of Cardiovascular Dysfunctions in Interstitial Lung Diseas epatients by Correlating the Levels of Serum NT PRO BNP and Microalbuminuria (Biomarkers of Cardiovascular Dysfunction) with Echocardiographic, Bronchoscopic and HighResolution Computed Tomography Findings of These ILD Patients" is awarded Best Article of Vol 12 issue 13 
A Study by Kannamani Ramasamy et al. entitled "COVID-19 Situation at Chennai City – Forecasting for the Better Pandemic Management" is awarded best article for  Vol 12 issue 12
A Study by Muhammet Lutfi SELCUK and Fatma entitled "Distinction of Gray and White Matter for Some Histological Staining Methods in New Zealand Rabbit's Brain" is awarded best article for  Vol 12 issue 11
A Study by Anamul Haq et al. entitled "Etiology of Abnormal Uterine Bleeding in Adolescents – Emphasis Upon Polycystic Ovarian Syndrome" is awarded best article for  Vol 12 issue 10
A Study by entitled "Estimation of Reference Interval of Serum Progesterone During Three Trimesters of Normal Pregnancy in a Tertiary Care Hospital of Kolkata" is awarded best article for  Vol 12 issue 09
A Study by Ilona Gracie De Souza & Pavan Kumar G. entitled "Effect of Releasing Myofascial Chain in Patients with Patellofemoral Pain Syndrome - A Randomized Clinical Trial" is awarded best article for  Vol 12 issue 08
A Study by Virendra Atam et. al. entitled "Clinical Profile and Short - Term Mortality Predictors in Acute Stroke with Emphasis on Stress Hyperglycemia and THRIVE Score : An Observational Study" is awarded best article for  Vol 12 issue 07
A Study by K. Krupashree et. al. entitled "Protective Effects of Picrorhizakurroa Against Fumonisin B1 Induced Hepatotoxicity in Mice" is awarded best article for issue Vol 10 issue 20
A study by Mithun K.P. et al "Larvicidal Activity of Crude Solanum Nigrum Leaf and Berries Extract Against Dengue Vector-Aedesaegypti" is awarded Best Article for Vol 10 issue 14 of IJCRR
A study by Asha Menon "Women in Child Care and Early Education: Truly Nontraditional Work" is awarded Best Article for Vol 10 issue 13
A study by Deep J. M. "Prevalence of Molar-Incisor Hypomineralization in 7-13 Years Old Children of Biratnagar, Nepal: A Cross Sectional Study" is awarded Best Article for Vol 10 issue 11 of IJCRR
A review by Chitra et al to analyse relation between Obesity and Type 2 diabetes is awarded 'Best Article' for Vol 10 issue 10 by IJCRR. 
A study by Karanpreet et al "Pregnancy Induced Hypertension: A Study on Its Multisystem Involvement" is given Best Paper Award for Vol 10 issue 09

List of Awardees

A Study by Ese Anibor et al. "Evaluation of Temporomandibular Joint Disorders Among Delta State University Students in Abraka, Nigeria" from Vol 13 issue 16 received Emerging Researcher Award


A Study by Alkhansa Mahmoud et al. entitled "mRNA Expression of Somatostatin Receptors (1-5) in MCF7 and MDA-MB231 Breast Cancer Cells" from Vol 13 issue 06 received Emerging Researcher Award


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International Journal of Current Research and Review (IJCRR) provides platform for researchers to publish and discuss their original research and review work. IJCRR can not be held responsible for views, opinions and written statements of researchers published in this journal

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