Untersuchungen zum Einfluss einer Air-Liquid-Interphase auf die Differenzierung von Alveolarepithelzellen Typ II

Die Dedifferenzierung der Alveolarepithelzellen Typ II stellt in vitro ein großes Problem dar. Zellen, die länger als 48 Stunden in vitro kultiviert werden tendieren zu einer Dedifferenzierung. Die vorliegende Arbeit stellt ein Air-Liquid-Interphasesystem zur Kultivierung von TypII-Zellen vor. Hierdurch ist es uns gelungen TypII-Zellen über einen Zeitraum von bis zu 14 Tagen in vitro auf einem hohen Grad der Differenzierung zu konservieren. Zellen die nicht so kultiviert wurden zeigten früh (48 Stunden) eine Dedifferenzierung. Untersucht wurden die Morphologie, metabolische Eigenschaften (Surfactanthaushalt), inflammatorische Faktoren und der Einfluß von Hypoxie.Type II alveolar epithelial cells still tend to lose their high differentiated properties when cultivating in vitro. We present a new cultivation modell in which type II cells show a high state of differentiation even when cultivating over 14 days in vitro. We studied the tendency of loosing high differentiation factors in this air-liquid-interhasemodell analyzing inflammatory factors, metabolic factors (surfactant system) and morphologic aspects of the cells. The used modell is a good in vitro modell for conservation type II cell differentiation

Functional recovery after implantation of artificial nerve grafts in the rat- a systematic review

<p>Abstract</p> <p>Purpose</p> <p>The aim of this study was to compare functional data of different nerve-gap bridging materials evaluated in rat experiments by means of a systematic review.</p> <p>Materials and methods</p> <p>A systematic review was conducted, searching MEDLINE, HTS and CENTRAL to identify all trials evaluating functional recovery of artificial nerve conduits in the rat model.</p> <p>Results</p> <p>There was a trend towards a favourable outcome of conduits coated with Schwann-cells compared to the plain synthetics. Histomorphometry, electrophysiology and muscle-weight correlated poorly with functional outcome.</p> <p>Conclusion</p> <p>Schwann-cell coated conduits showed promising results concerning functional recovery. Further standardization in outcome reporting is encouraged.</p

Sensoric Protection after Median Nerve Injury: Babysitter-Procedure Prevents Muscular Atrophy and Improves Neuronal Recovery

The babysitter-procedure might offer an alternative when nerve reconstruction is delayed in order to overcome muscular atrophy due to denervation. In this study we aimed to show that a sensomotoric babysitter-procedure after median nerve injury is capable of preserving irreversible muscular atrophy. The median nerve of 20 female Wistar rats was denervated. 10 animals received a sensory protection with the N. cutaneous brachii. After six weeks the median nerve was reconstructed by autologous nerve grafting from the contralateral median nerve in the babysitter and the control groups. Grasping tests measured functional recovery over 15 weeks. At the end of the observation period the weight of the flexor digitorum sublimis muscle was determined. The median nerve was excised for histological examinations. Muscle weight (P<0.0001) was significantly superior in the babysitter group compared to the control group at the end of the study. The histological evaluation revealed a significantly higher diameter of axons (P=0.0194), nerve fiber (P=0.0409), and nerve surface (P=0.0184) in the babysitter group. We conclude that sensory protection of a motor nerve is capable of preserving muscule weight and we may presume that metabolism of the sensory nerve was sufficient to keep the target muscle’s weight and vitality