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Identification of Intracellular Signaling Events Induced in Viable Cells by Interaction with Neighboring Cells Undergoing Apoptotic Cell Death
Published on: December 27, 2016
Identification of specific peptide ligands for B-lymphoma cell and its effect on tyrosine phosphorylation and cell
Liangwen Song1, Xianmei Ma, Xuemei Cui
1Department of Pathology, Beijing Institute of Radiation Medicine, Beijing 100850.
Objective:
To search novel method for diagnosis and therapy of B-lymphoma, specific small molecular peptide ligands against binding site of tumor cells were screened and its effects on signal transduction and cell apoptosis were tested.
Methods:
Specific peptide ligands were screened by binding with site of human B lymphoma cell (OC1LY8) using peptide-bead libraries. The identified peptides were characterized with responsible cells by rebinding test. The role of tyrosine phosphorylation of peptide ligand was tested by Western blot; and its apoptosispromoting role was observed by confocal fluorescent microscope.
Results:
Specific peptide ligand was able to bind specifically to site on cell surface and enter into cytoplasm. Tetrameric peptide ligand was able to strongly trigger signal transduction resulting in tyrosine phosphorylation and cellular apoptosis in OC1LY8 cell line.
Conclusion:
Screened peptide ligand can effectively bind with OC1LY8 cell, stimulate cellular tyrosine phosphorylation and induce cellular apoptosis.
Insights
Researchers identified a novel peptide ligand that binds to B-lymphoma cells, triggering signal transduction and inducing apoptosis. This offers a potential new method for B-lymphoma diagnosis and therapy.
Area of Science:
- Oncology
- Molecular Biology
- Biochemistry
Background:
- B-cell lymphoma is a significant hematological malignancy.
- Novel therapeutic strategies targeting specific tumor cell surface markers are needed.
- Understanding signal transduction pathways involved in lymphoma cell apoptosis is crucial.
Purpose of the Study:
- To discover a novel peptide ligand for B-cell lymphoma diagnosis and therapy.
- To screen for small molecular peptide ligands that bind to B-lymphoma tumor cells.
- To investigate the effects of these peptide ligands on signal transduction and cell apoptosis.
Main Methods:
- Peptide ligands were screened using peptide-bead libraries against the human B lymphoma cell line (OC1LY8).
- Ligand specificity was confirmed through re-binding tests.
- Tyrosine phosphorylation was assessed via Western blot, and apoptosis was visualized using confocal fluorescence microscopy.
Main Results:
- A specific peptide ligand was identified that binds to the cell surface of OC1LY8 cells and enters the cytoplasm.
- A tetrameric form of the peptide ligand effectively triggered signal transduction, leading to tyrosine phosphorylation.
- This process resulted in significant cellular apoptosis in the OC1LY8 cell line.
Conclusions:
- The screened peptide ligand demonstrates effective binding to OC1LY8 cells.
- The ligand stimulates cellular tyrosine phosphorylation.
- The peptide ligand successfully induces cellular apoptosis in B-lymphoma cells.
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