Adipose-derived stem cells (ASCs) secrete many cytokines, proteins, growth factors, and extracellular vesicles with beneficial outcomes that can be used in regenerative medicine. It has great potential, and the development of new treatment strategies using the ASCs secretome is of global interest. Besides cytokines, proteins, and growth factors, the therapeutic effect of secretome is hidden in non-coding RNAs such as miR-21, miR-24, and miR-26 carried via exosomes secreted by adequate cells. The whole secretome, including ASC-derived exosomes (ASC-exos) has been proven in many studies to have immunomodulatory, proangiogenic, neurotrophic, and epithelization activity and can potentially be used for neurodegenerative, cardiovascular, respiratory, inflammatory, and autoimmune diseases as well as wound healing treatment. Due to limitations in the use of stem cells in cell-based therapy, its secretome with emphasis on exosomes seems to be a reasonable and safer alternative with increased effectiveness and fewer side effects. Moreover, the great advantage of cell-free therapy is the possibility of biobanking the ASCs secretome. In this review, we focus on the current state of knowledge on the use of the ASCs secretome in stem cell-free therapy.

Adipose-derived stem/stromal cells (ASCs) have tremendous potential for use in regenerative medicine; their secretome is especially important for regenerative processes. We hypothesized that exposure of ASCs to an electromagnetic field (EMF) can influence the proregenerative potential of cells by influencing the secretion of growth factors (GFs) responsible for regenerative properties. We showed that the exposure of ASCs to an EMF (50 Hz; 1.5mT) affected the secretion of GFs as well as the cell cycle process. The most important observation was a statistically significant, 3-fold increase in FGF-2 concentration at 48 h, and a 2-fold decrease at 72 h when compared to the control group. This finding is very important for regenerative medicine, because with precisely adjusted parameters, an EMF can be used to stimulate the production of GFs, mainly of FGF-2, by ASCs, thereby increasing proregenerative properties. The ASC secretome after EMF treatment could be a method for easy, simple and costeffective stem cell differentiation and therapy facilitation.

Introduction. Structural glycans have great biological significance and are involved in signaling and cell communication of the immune system. They are attached to proteins and lipids in an enzymatic process called glycosylation where glycosyltransferase and glycosidases bind sugar residues and lead to the formation of bioconjugates. Aim. In this paper we describe the importance of glycosylation in the immune system and its changes in diseases. Material and methods. This review was performed according to systematic literature search of major bibliographic databases. Results. Proper glycosylation ensures the functioning of the organism, however, defects in structural glycans of immune system changes their properties and can lead to disorders and further to autoimmune diseases. It has been also proven that glycosylation of autoimmune system is changed during cancer. In this paper we described types of structural glycans, significance of glycosylation of selected components of the immune system and its modifications in disorders. Conclusions. Knowledge about changes in the glycosylation in diseases is the key to understanding the processes of autoimmune diseases and may allow the development of new treatments in the future.

No abstract