Hyaluronic acid based materials for intestine tissue engineering: a morphological and biochemical study of cell-material interaction.

A wide number of gastro-intestinal disorders are associated with structural alterations of this district leading to an impaired gastrointestinal function. The study of cell material interactions represents one of the major issues for the development of tissue engineering purposes. Benzyl esters of hyaluronic acid are promising materials because they exhibit good tissue compatibility and are available in various configurations. In this work they have been studied for the possible application of intestinal cell growth and functioning. The preliminary investigation on the morphologic and biochemistry data obtained by monitoring the growth and differentiation of intestinal epithelial cells on two hyaluronic acid benzyl esters is reported. Two types of materials structures were studied: a three dimensional matrix and a macroporous flat sheet membrane. Caco-2 cell line was used: these cells undergo spontaneous enterocytic differentiation after several days in culture. The differentiation status of these cells grown on different materials was used as a parameter of biocompatibility and cell functioning. The status of cell growth and differentiation was monitored by studying cell morphology using scanning electron microscopy. The results obtained were confirmed by biochemical determinations. Although both the configurations of the two polymers exhibited good compatibility with respect to intestinal cells, only the flat sheet membrane proved to induce cell differentiation, leading us to the conclusion that it is a promising substrate for the proposed application.

[Cysts and pseudocysts of the maxillary sinus]. / Neoformazioni cistiche e pseudocistiche a partenza dal seno mascellare.

The AA. describe the aetiopathogetical remarks, the actual nosologic and histopathologic arrangement, the clinical observations, the diagnostic and therapeutic trend of the cysts and pseudocysts arising from the mucosa of the maxillary sinus.

[Stafne bone defect, a rare clinical case]. / Lacuna ossea di Stafne, un raro caso clinico.

The AA. report a case of Stafne's bone defect describing its clinical and radiographic features and touch on etiopathogenesy, incidence and diagnosis.

[Essential bone defects]. / Lacune ossee essenziali.

The AA. describing the TBP and their etiopathogenetic, histopathologic, clinical, therapeutic aspects.