This work follows from that of Blumberg & Ogston (1957). They showed that papain is a specific agent for degrading the protein part of the hyaluronic acid complex isolated from ox synovial fluid by filtration (Ogston & Stanier, 1950), and that when this protein is degraded marked changes in the non-Newtonian viscosity occur. This is associated with a marked decrease in the molecular weight and ...

A method for making mucopolysaccharide molecules visible in the electron microscope is reported and is applied to elucidate the structure of hyaluronic acid. The method is essentially that of Kleinschmidt and Zahn' 2 for nucleic acids: the polyanion strands are combined with a positively charged protein, such as cytochrome c, incorporated into a surface film of the protein, and then shadowed wi...

AN attempt has been made to find the cells of origin and the time of origin during development of the vitreous hyaluronic acid. The adult vitreous body of those species so far examined seems to owe its characteristic jelly-like properties to the presence of small amounts of an insoluble collagen-like protein laid down in fibrous lamellae and a low concentration of hyaluronic acid. Earlier work ...

UNLABELLED Hormone plays an important role in the larynx. Among other substances, vocal folds contain hyaluronic acid, which tissue concentration may vary according to hormone action. AIM the objective of this study is to analyze hyaluronic acid concentration in the vocal folds during estral and gravidic-puerperal cycles. MATERIALS AND METHODS Experimental study. 40 adult rats were divided ...

BACKGROUND A double-network (DN) gel, which was composed of poly-(2-Acrylamido-2-methylpropanesulfonic acid) and poly-(N,N'-dimethyl acrylamide) (PAMPS/PDMAAm), has the potential to induce chondrogenesis both in vitro and in vivo. The present study investigated whether DN gel induced chondrogenic differentiation of ATDC5 cells in a maintenance medium without insulin, and whether supplementation...

The cell-free synthesis of hyaluronic acid has been demonstrated in extracts of cultured human fibroblasts. Preparations from fibroblasts of normal individuals as well as those from patients with Marfan syndrome incorporate glucuronic acid and N-acetylglucosamine from their UDP derivatives into hyaluronic acid. Extracts from Marfan fibroblasts demonstrate 3 to 10 times more total and specific h...

Tribological surgical adjuvants constitute a therapeutic discipline made possible by surgical advances in the treatment of damaged articular cartilage beyond palliative care. The purpose of this study is to analyze interactions between hyaluronic acid and phospholipid molecules, and the formation of geometric forms, that play a role in the facilitated lubrication of synovial joint organ systems...

Cumulus oocyte complex (COC) expansion is induced through hyaluronic acid production and accumulation of proteins of the inter-alpha-trypsin inhibitor family in the gonadotropin-stimulated cumulus cells. Link protein, a glycoprotein found in cartilage, interacts specifically with hyaluronic acid and stabilizes the binding of proteoglycan monomers to hyaluronic acid to form aggregates. The aim o...

The present study was performed to evaluate the anti-ulcerogenic activity of hyaluronic acid against ethanol induced gastric mucosal injury in rats. Four groups of adult Sprague Dawley rats were orally pretreated respectively with distilled water (ulcer control groups), omeprazole (reference group), high molecular weight hyaluronic acid and 0.8% hyaluronic acid gel (experimental groups) one hou...

OBJECTIVE This study sought to compare the effects and outcomes of two ophthalmic viscosurgical devices, 1.6% hyaluronic acid/4.0% chondroitin sulfate and 2.0% hydroxypropylmethylcellulose, during phacoemulsification. METHODS This prospective, randomized clinical trial comprised 78 eyes (39 patients) that received phacoemulsification performed by the same surgeon using a standardized techniqu...