therapy-testing-spheroid-based-3d-cell-culture-model-for-head-neck

Therapy Testing in a Spheroid-based 3D Cell Culture Model for Head and Neck Squamous Cell Carcinoma

Current treatment options for advanced and recurrent head and neck squamous cell carcinoma (HNSCC) enclose radiation and chemo-radiation approaches with ...

Johannes-Gutenberg University Medical Center

Rapid fibrovascularization is a prerequisite for successful biomaterial engraftment. In addition to their well-known roles in fibrinolysis, urokinase-type plasminogen activator (uPA) and tissue plasminogen activator (tPA) or their inhibitor plasminogen activator inhibitor-1 (PAI-1) have recently been implicated as individual mediators in non-fibrinolytic processes, including cell adhesion, migration, and proliferation. Since these events are critical for fibrovascularization of biomaterial, we hypothesized that the components of the plasminogen activation system contribute to biomaterial engraftment. Employing in vivo and ex vivo microscopy techniques, vessel and collagen network formation within porous polyethylene (PPE) implants engrafted into dorsal skinfold chambers were found to be significantly impaired in uPA-, tPA-, or PAI-1-deficient mice. Consequently, the force required for mechanical disintegration of the implants out of the host tissue was significantly lower in the mutant mice than in wild-type controls. Conversely, surface coating with recombinant uPA, tPA, non-catalytic uPA, or PAI-1, but not with non-catalytic tPA, accelerated implant vascularization in wild-type mice. Thus, uPA, tPA, and PAI-1 contribute to the fibrovascularization of PPE implants through common and distinct effects. As clinical perspective, surface coating with recombinant uPA, tPA, or PAI-1 might provide a novel strategy for accelerating the vascularization of this biomaterial. 

Components of the plasminogen activation system promote engraftment of porous polyethylene biomaterial via common and distinct effects.

Persistent dizziness symptoms after cochlear implantation have an impact on quality of life. In this study, the effects of bilateral cochlear implants (CI) on quality of life as well as on subjective dizziness complaints are analyzed using questionnaires, some of which have never been applied before in these patient collectives.

Article	Year
Components of the plasminogen activation system promote engraftment of porous polyethylene biomaterial via common and distinct effects. PloS one\| PubMed ID: 25658820	2015
[Quality of life and vertigo after bilateral cochlear implantation : Questionnaires as tools for quality assurance]. HNO\| PubMed ID: 29230508	2018

Sebastian Strieth

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