Clinical Trials Logo

Clinical Trial Summary

Fractalkine (FKN) is a chemoattractant and adhesion molecule for leukocytes. Angiogenic effect of FKN also has been reported. We investigate FKN-mediated angiogenesis in ocular angiogenic disorders.


Clinical Trial Description

Fractalkine (FKN), the sole member of the CX3C chemokine family, is named for its fractal geometry. The CX3C motif, with three amino acids between the two terminal cysteines, makes fractalkine distinct from other chemokines.The structure of fractalkine, a membrane-bound glycoprotein with the chemokines domain atop an extended mucin-like stalk, also is unique.Membrane-bound FKN can be markedly induced on primary endothelial cells by inflammatory cytokines; this form promotes the robust adhesion of monocytes and T lymphocytes. Soluble FKN can be released by proteolysis at an efficient chemotactic activity level for monocytes and T cells. Thus, FKN is a versatile molecule regulating both cell-cell interactions in its membrane-bound form and directed-cell migration in its soluble form. The receptor of FKN, CXC3R1, is a G protein-couple protein, which expresses T lymphocytes, monocytes, natural killer (NK) cells, microglia, and neurons.Sulfation of tyrosine enhances the function of CX3CR1 in cell capture and firm adhesion. Fractalkine is expressed constitutively in the kidney, heart, lung, and brain. Fractalkine has demonstrated an important role in CNS inflammation, cardiac allograft rejection, arteriogenesis, renal disease, psoriasis, and during pregnancy. Silverman et al demonstrated the presence of FKN in normal cultured microvascular endothelial and stromal cells of iris and retina in vitro. Upon inflammatory cytokine stimulation, EC also express FKN and its receptors with FKN secretion in an autocrine manner. In addition to EC chemotaxis and tube formation, FKN is an angiogenic mediator in rheumatoid arthritis. Therefore, we hypothesize that FKN not only participates in ocular inflammatory reactions, but also plays an important role in ocular angiogenesis. ;


Study Design

Observational Model: Case Control, Time Perspective: Prospective


Related Conditions & MeSH terms


NCT number NCT00728598
Study type Observational
Source National Taiwan University Hospital
Contact
Status Completed
Phase N/A
Start date January 1998
Completion date December 1998

See also
  Status Clinical Trial Phase
Recruiting NCT01921192 - Effect of Folic Acid, Vitamin B6 and Vitamin B12 in Diabetic Retinopathy Phase 4
Recruiting NCT01044875 - Trial of Yellow 577 nm Laser Versus Green 532 nm Laser for Proliferative Diabetic Retinopathy N/A
Active, not recruiting NCT00993525 - Intravitreal Ranibizumab For Persistent New Vessels In Diabetic Retinopathy(Inipe Study) Phase 1/Phase 2
Completed NCT01307072 - Compliance to Ophthalmic Follow-up Examinations and Surgical Outcome for Proliferative Diabetic Retinopathy N/A
Completed NCT01758757 - Comparison of Small-gauge Vitrectomy and Conventional Vitrectomy for Proliferative Diabetic Retinopathy N/A
Withdrawn NCT00600236 - HLA and it Relation With the Development of Proliferative Diabetic Retinopathy in Mexican Population Phase 3
Completed NCT05408416 - Comparison of Surgery Outcome Between Preoperative IVR and Intraoperative IVR in PPV for PDR N/A
Completed NCT05414149 - Efficacy and Safety Comparison of IVR and IVC Before Vitrectomy in Proliferative Diabetic Retinopathy N/A
Not yet recruiting NCT04464694 - Pre-vitrectomy Intravitreal Ranibizumab for Patients With Proliferative Diabetic Retinopathy Combined With Diabetic Macular Edema Phase 4
Not yet recruiting NCT03633266 - Anti-VEGF Instead of Intraoperative PRP in Proliferative Diabetic Retinopathy N/A
Completed NCT03490318 - Effectiveness of Multimodal Imaging for the Evaluation of Retinal Oedema And New vesseLs in Diabetic Retinopathy
Completed NCT01627977 - Association of Lutein, Zeaxanthin and Brilliant Blue in Chromovitrectomy Phase 3
Completed NCT00776763 - Ocular Growth Factors Profile in Proliferative Retinopathies Before and After Intravitreal Bevacizumab Phase 2
Terminated NCT00563043 - Changes in Electroretinogram and Contrast Sensitivity After PASCAL Treatment Phase 4
Completed NCT00682240 - Morphological and Functional Retinal Changes Following Retinal Photocoagulation Phase 4
Terminated NCT00563628 - Changes in Macular Thickness After Patterns Scan Laser Phase 4
Completed NCT00446381 - Effect of Macugen(Pegaptanib)on Surgical Outcomes and VEGF Levels in Diabetic Patients With PDR (Diabetic Retinopathy or CSDME (Macular Edema) N/A
Completed NCT02879422 - Genetic Markers and Proliferative Diabetic Retinopathy N/A
Enrolling by invitation NCT02911311 - Conbercept vs Panretinal Photocoagulation for the Management of Proliferative Diabetic Retinopathy N/A
Recruiting NCT05514925 - Cryoapplication Versus Anti-VEGF Before Diabetic Vitrectomy Phase 4