Human granulocyte-colony stimulating factor (G-CSF)/stem cell factor (SCF) fusion proteins: design, characterization and activity
| Autor: | Ernesta Buzavaite-Verteliene, Zilvinas Dapkunas, Gitana Mickiene, Zigmas Balevičius, Milda Pleckaityte, Ieva Plikusiene, Audronė Rukšėnaitė, Indrė Dalgėdienė, Gintautas Zvirblis |
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| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
lcsh:Medicine
Peptide Stem cell factor G-CSF Biochemistry General Biochemistry Genetics and Molecular Biology 03 medical and health sciences 0302 clinical medicine Linker Western blot Protein purification Absolute neutrophil count medicine Fusion proteins SCF linker hematopoiesis cytokines absolute neutrophil count protein purification activity Receptor 030304 developmental biology chemistry.chemical_classification 0303 health sciences medicine.diagnostic_test Chemistry Cell growth General Neuroscience lcsh:R General Medicine Fusion protein Molecular biology Hematopoiesis Activity Cell culture 030220 oncology & carcinogenesis Cytokines General Agricultural and Biological Sciences Biotechnology |
| Zdroj: | PeerJ, London : PeerJ Inc., 2020, vol. 8, art. no. c9788, p. 1-23 PeerJ PeerJ, Vol 8, p e9788 (2020) |
| ISSN: | 2167-8359 |
| Popis: | BackgroundStem cell factor (SCF) and granulocyte-colony stimulating factor (G-CSF) are well-characterized vital hematopoietic growth factors that regulate hematopoiesis. G-CSF and SCF synergistically exhibit a stimulatory effect on hematopoietic progenitors. The combination of G-CSF and SCF has been used for mobilization of peripheral blood progenitor cells in cancer and non-cancerous conditions. To overcome challenges connected with the administration of two cytokines, we developed two fusion proteins composed of human SCF and human G-CSF interspaced by an alpha-helix-forming peptide linker.MethodsThe recombinant proteins SCF-Lα-GCSF and GCSF-Lα-SCF were purified in three steps using an ion-exchange and mixed-mode chromatography. The purity and quantity of the proteins after each stage of purification was assessed using RP-HPLC, SDS-PAGE, and the Bradford assays. Purified proteins were identified using high-performance liquid chromatography/electrospray ionization mass spectrometry (HPLC/ESI-MS) and the Western blot analyses. The molecular weight was determined by size exclusion HPLC (SE-HPLC). The activity of heterodimers was assessed using cell proliferation assays in vitro. The capacity of recombinant fusion proteins to stimulate the increase of the absolute neutrophil count in rats was determined in vivo. The binding kinetics of the proteins to immobilized G-CSF and SCF receptors was measured using total internal reflection ellipsometry and evaluated by a standard Langmuir kinetics model.ResultsThe novel SCF-Lα-GCSF and GCSF-Lα-SCF proteins were synthesized inEscherichia coli. The purity of the heterodimers reached >90% as determined by RP-HPLC. The identity of the proteins was confirmed using the Western blot and HPLC/ESI-MS assays. An array of multimeric forms, non-covalently associated dimers or trimers were detected in the protein preparations by SE-HPLC. Each protein induced a dose-dependent proliferative response on the cell lines. At equimolar concentration, the heterodimers retain 70–140% of the SCF monomer activity (p≤ 0.01) in promoting the M-07e cells proliferation. The G-CSF moiety in GCSF-Lα-SCF retained 15% (p≤ 0.0001) and in SCF-Lα-GCSF retained 34% (p≤ 0.01) of the monomeric G-CSF activity in stimulating the growth of G-NFS-60 cells. The obtained results were in good agreement with the binding data of each moiety in the fusion proteins to their respective receptors. The increase in the absolute neutrophil count in rats caused by the SCF-Lα-GCSF protein corresponded to the increase induced by a mixture of SCF and G-CSF. |
| Databáze: | OpenAIRE |
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