title: Preparation of Proper Immunogen by Cloning and Stable Expression of cDNA coding for Human Hematopoietic Stem Cell Marker CD34 in NIH-3T3 Mouse Fibroblast Cell Line.
abstract: OBJECTIVE
  Transmembrane CD34 glycoprotein is the most important marker for identification, isolation and enumeration of hematopoietic stem cells (HSCs). We aimed in this study to clone the cDNA coding for human CD34 from KG1a cell line and stably express in mouse fibroblast cell line NIH-3T3. Such artificial cell line could be useful as proper immunogen for production of mouse monoclonal antibodies.
  
  
  METHODS
  CD34 cDNA was cloned from KG1a cell line after total RNA extraction and cDNA synthesis. Pfu DNA polymerase-amplified specific band was ligated to pGEMT-easy TA-cloning vector and sub-cloned in pCMV6-Neo expression vector. After transfection of NIH-3T3 cells using 3 μg of recombinant construct and 6 μl of JetPEI transfection reagent, stable expression was obtained by selection of cells by G418 antibiotic and confirmed by surface flow cytometry.
  
  
  RESULTS
  1158 bp specific band was aligned completely to reference sequence in NCBI database corresponding to long isoform of human CD34. Transient and stable expression of human CD34 on transfected NIH-3T3 mouse fibroblast cells was achieved (25% and 95%, respectively) as shown by flow cytometry.
  
  
  CONCLUSIONS
  Cloning and stable expression of human CD34 cDNA was successfully performed and validated by standard flow cytometric analysis. Due to murine origin of NIH-3T3 cell line, CD34-expressing NIH-3T3 cells could be useful as immunogen in production of diagnostic monoclonal antibodies against human CD34. This approach could bypass the need for purification of recombinant proteins produced in eukaryotic expression systems.
authors: Immunology Research Center, Tabriz University of Medical Sciences, Tabriz, Iran. ; Department of Immunology, International Branch of Aras, Tabriz University of Medical Sciences, Tabriz, Iran. ; Students' Research Committee, Tabriz University of Medical Sciences, Tabriz, Iran.
authors: Farzaneh
authors: F
authors: Shafaghat
authors: Department of Immunology, Faculty of Medicine, Tabriz University of Medical Sciences, Tabriz, Iran.
authors: Hajar
authors: H
authors: Abbasi-Kenarsari
authors: Immunology Research Center, Tabriz University of Medical Sciences, Tabriz, Iran. ; Department of Immunology, Faculty of Medicine, Tabriz University of Medical Sciences, Tabriz, Iran.
authors: Jafar
authors: J
authors: Majidi
authors: Hematology and Oncology Research Center, Tabriz University of Medical Sciences, Tabriz, Iran.
authors: Ali Akbar
authors: AA
authors: Movassaghpour
authors: Immunology Research Center, Tabriz University of Medical Sciences, Tabriz, Iran.
authors: Dariush
authors: D
authors: Shanehbandi
authors: Drug Applied Research Center, Tabriz University of Medical Sciences, Tabriz, Iran.
authors: Tohid
authors: T
authors: Kazemi
keywords: CD34; Cloning; Eukaryotic Expression; HSCs; KG1a