CXCR4 (Phospho-Ser339) ELISA Kit (DEIA-XYA492)

Regulatory status: For research use only, not for use in diagnostic procedures.

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Size
2 x 96T
Sample
cultured cells
Species Reactivity
Human, Mouse, Rat
Intended Use
The CXCR4 (Phospho-Ser339) Cell-Based ELISA Kit is a convenient, lysate-free, high throughput and sensitive assay kit that can monitor CXCR4 protein phosphorylation and expression profile in cells. The kit can be used for measuring the relative amounts of phosphorylated CXCR4 in cultured cells as well as screening for the effects that various treatments, inhibitors (ie. siRNA or chemicals), or activators have on CXCR4 phosphorylation.
Contents of Kit
1. 96-Well Cell Culture Clear-Bottom Microplate: 2 plates
2. 10x TBS: 24 mL (10x)
3. Quenching Buffer: 24 mL (1x)
4. Blocking Buffer: 50 mL (1x)
5. 10x Wash Buffer: 50 mL (10x)
6. 100x Anti-CXCR4 (Phospho-Ser339) Antibody (Rabbit Polyclonal): 60 μL (100x), Red
7. 100x Anti-CXCR4 Antibody (Rabbit Polyclonal): 60 μL (100x), Purple
8. 100x Anti-GAPDH Antibody (Mouse Monoclonal): 60 μL (100x), Green
9. HRP-Conjugated Anti-Rabbit IgG Antibody: 12 mL (1x), Glass
10. HRP-Conjugated Anti-Mouse IgG Antibody: 12 mL (1x), Glass
11. Primary Antibody Diluent: 12 mL (1x)
12. Ready-to-Use Substrate: 12 mL (1x), Brown
13. Stop Solution: 12 mL (1x)
14. Crystal Violet Solution: 12 mL (1x), Glass
15. SDS Solution: 24 mL (1x)
16. Adhesive Plate Seals: 4 seals
Storage
4°C/6 Months

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References


GPRASP proteins are critical negative regulators of hematopoietic stem cell transplantation

BLOOD

Authors: Morales-Hernandez, Antonio; Benaksas, Chaima; Chabot, Ashley; Caprio, Claire; Ferdous, Maheen; Zhao, Xiwen; Kang, Guolian; McKinney-Freeman, Shannon

Hematopoietic stem cell (HSC) transplantation (HSCT) is often exploited to treat hematologic disease. Donor HSCs must survive, proliferate, and differentiate in the damaged environment of the reconstituting niche. Illuminating molecular mechanisms regulating the activity of transplanted HSCs will inform efforts to improve HSCT. Here, we report that G-protein-coupled receptor-associated sorting proteins (GPRASPs) function as negative regulators of HSCT. Silencing of Gprasp1 or Gprasp2 increased the survival, quiescence, migration, niche retention, and hematopoietic repopulating activity of hematopoietic stem and progenitor cells (HSPCs) post-transplant. We further show that GPRASP1 and GPRASP2 promote the degradation of CXCR4, a master regulator of HSC function during transplantation. CXCR4 accumulates in Gprasp-deficient HSPCs, boosting their function posttransplant. Thus, GPRASPs negatively regulate CXCR4 stability in HSCs. Our work reveals GPRASP proteins as negative regulators of HSCT and CXCR4 activity. Disruption of GPRASP/CXCR4 interactions could be exploited in the future to enhance the efficiency of HSCT.

Discovery of Potential Chemical Probe as Inhibitors of CXCL12 Using Ligand-Based Virtual Screening and Molecular Dynamic Simulation

MOLECULES

Authors: Haider, Sajjad; Barakat, Assem; Ul-Haq, Zaheer

CXCL12 are small pro-inflammatory chemo-attractant cytokines that bind to a specific receptor CXCR4 with a role in angiogenesis, tumor progression, metastasis, and cell survival. Globally, cancer metastasis is a major cause of morbidity and mortality. In this study, we targeted CXCL12 rather than the chemokine receptor (CXCR4) because most of the drugs failed in clinical trials due to unmanageable toxicities. Until now, no FDA approved medication has been available against CXCL12. Therefore, we aimed to find new inhibitors for CXCL12 through virtual screening followed by molecular dynamics simulation. For virtual screening, active compounds against CXCL12 were taken as potent inhibitors and utilized in the generation of a pharmacophore model, followed by validation against different datasets. Ligand based virtual screening was performed on the ChEMBL and in-house databases, which resulted in successive elimination through the steps of pharmacophore-based and score-based screenings, and finally, sixteen compounds of various interactions with significant crucial amino acid residues were selected as virtual hits. Furthermore, the binding mode of these compounds were refined through molecular dynamic simulations. Moreover, the stability of protein complexes, Root Mean Square Deviation (RMSD), Root Mean Square Fluctuation (RMSF), and radius of gyration were analyzed, which led to the identification of three potent inhibitors of CXCL12 that may be pursued in the drug discovery process against cancer metastasis.

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