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Assessment of Resistance to Tyrosine Kinase Inhibitors by an Interrogation of Signal Transduction Pathways by Antibody Arrays
Published on: September 19, 2018
Detecting Receptor Tyrosine Kinase ROR1 Using a Developed Anti-ROR1 Polyclonal Antibody
Azam Hemmati1, Hadi Hassannia1, Saeideh Milani1
1Antibody-Antigen Engineering Department, Monoclonal Antibody Research Center, Avicenna Research Institute , ACECR, Tehran, Iran .
Abstract:
Receptor tyrosine kinase ROR1 has been introduced as an interesting prognostic cancer marker in histopathology. The aim of this study was to produce a polyclonal antibody (PAb) against recombinant human ROR1 protein to be used as a tool for investigation of ROR1 expression in human cancer tissue blocks. The extracellular part of human ROR1 recombinant protein was expressed using pET-28b(+) plasmid in Escherichia coli Bl21(DE3) host. The recombinant ROR1, as a candidate immunogen, was purified and injected to a New Zealand rabbit. Followed by raising the titration of antibody, polyclonal anti-ROR1 antibody was purified through affinity chromatography column. After determining the purity of PAb anti-ROR1, its specific reactivity was assessed through various assessments. Flow cytometry analysis showed that PAb anti-ROR1 specifically recognizes ROR1 molecule in a number of positive and negative cell lines. Results obtained from detection of ROR1 in paraffin-embedded breast adenocarcinoma tissue blocks (n = 11) also demonstrated that PAb anti-ROR1 can effectively be used in immunohistochemistry. In conclusion, the developed anti-ROR1 PAb can be used as a tool for determining the prognostic value of ROR1 in histopathology of cancer tissues.
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