A hyaluronic acid-based filler reduces lipolysis in human mature adipocytes and maintains adherence and lipid accumulation of long-term differentiated human preadipocytes.

The beneficial role of subcutaneous adipose tissue in skin rejuvenation derived from its capacity to fill the under-layer volumes but also from its ability to regulate the extracellular matrix production by dermis fibroblasts. Hyaluronic acid (HA), a major component of the extracellular matrix, is a commonly used injectable dermal filler showing excellent efficiencies to maintain tissue augmentation even after its biodegradation. To improve their stability, the HA molecules can also be "cross-linked" to each other. The effects of cross-linked HA-based fillers on the dermal structure are well known. For safety reasons, most of the physicians prefer to use the blunt cannula for injections. However, evidences showed that the cannula could not be located in the dermis, but it passes through immediate hypodermis and the long-lasting effect of cross-linked HA-based fillers may be related to its effects on adipose tissue. To test whether cross-linked HA has a direct effect on human adipocytes, we treated isolated adipocytes and precursors cells from human skin donors with cross-linked HA. Biochemical and cellular analysis demonstrated that treatment by cross-linked HA showed beneficial effects on differentiated cell adherence and survival as well as reduced basal and induced lipolysis in fully mature adipocytes. Taken together, these data showed that cross-linked HA promoted cell adherence and preserved the adipogenic capacity of preadipocytes during prolonged cell culture, bringing additional evidences of the beneficial role of cross-linked HA-based fillers in maintenance of the subcutaneous fat mass. This first study could defend a preventive approach to facial volume loss during natural aging.

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