Abstract: The present invention provides a chimeric protein that has a modular structure and comprises a receptor binding domain (RBD) from the spike protein (S) of coronaviruses, a segment able to bind the core antigen from the Hepatitis B Virus (HBcAg), a segment including six consecutive histidine residues (HHHHHH), and two spacer segments. In this chimeric protein the aforementioned segments are arranged in a specific order, and the protein is able to form hybrid nanoparticles with HBcAg. The chimeric protein is part of vaccine compositions used for the prevention of coronavirus infections. Therefore, the invention discloses a method for the prevention of coronavirus infections, whereby a vaccine composition comprising said chimeric protein is administered.

Abstract: This invention provides new antibodies (Ab) and fragments that recognize the extracellular region of the human epidermal growth factor receptor (hEGFR) with a higher affinity than the Ab nimotuzumab, thus been able to recognize more efficiently lines with medium expression of EGFR. The present invention also relates to pharmaceutical compositions comprising as active principle the disclosed Abs and fragments and their use in the therapy of tumors with EGFR expression. In addition, it relates to the use of the Abs and fragments disclosed linked to a radioisotope or fluorophore for the localization of EGFR positive tumors. Additionally, the Abs and fragments disclosed can be used in the directionalization of the immune response to EGFR positive tumor cells when they are fused to protein or protein domains of immunological interest.

Abstract: This invention provides new antibodies (Ab) and fragments that recognize the extracellular region of the human epidermal growth factor receptor (hEGFR) with a higher affinity than the Ab nimotuzumab, thus been able to recognize more efficiently lines with medium expression of EGFR. The present invention also relates to pharmaceutical compositions comprising as active principle the disclosed Abs and fragments and their use in the therapy of tumors with EGFR expression. In addition, it relates to the use of the Abs and fragments disclosed linked to a radioisotope or fluorophore for the localization of EGFR positive tumors. Additionally, the Abs and fragments disclosed can be used in the directionalization of the immune response to EGFR positive tumor cells when they are fused to protein or protein domains of immunological interest.

Abstract: The present invention relates to the field of Biotechnology, particularly to a method based on the introduction of a single mutation in the genes encoding the human IL-2 and the muteins derived thereof that results in increased secretion levels in different hosts without affecting their biological functions. In particular, these mutations are based on a non-conservative change in the amino acid located in position 35 in the primary sequence of human IL-2, preferably the substitutions are K35E, K35D and K35Q. Another object of the present invention are the expression systems used to obtain both the recombinant human IL-2 and the muteins derived thereof using the method described in this invention. The above-mentioned method is useful to improve the production efficiency of the recombinant human IL-2 and the muteins derived thereof both at laboratory and industrial scales.

Abstract: The present invention relates to new monoclonal antibodies and fragments of these antibodies, which have dual specificity and high affinity for N-acetyl GM3 and N-glycolyl GM3 and do not recognize other gangliosides. In another aspect, the present invention relates to the use of these antibodies and their fragments in the therapy of tumors characterized by a significant expression of any of the two antigens recognized by these antibodies, or a mixed expression of both antigens. Likewise, the invention relates to the use of these antibodies in the diagnosis of tumors expressing at least one of the two variants of the GM3 ganglioside.

Abstract: The present invention reveals human recombinant antibodies that recognize the human Vascular Endothelium Growth Factor A (VEGF-A), block its interaction with the VEGFR2 receptor, and interfere with its proliferative effect in vitro and pro-angiogenic effect in vivo. The antibodies identify an epitope on human VEGF-A different from any other previously reported, and were obtained by combining one immunoglobulin light chain variable region with other three heavy chain ones. The antibodies were obtained by human immunoglobulin variable region mutagenesis, and can be employed for the immunotherapy of pathological entities associated with an increase in vasculature, such as age-related macular degeneration, cancer, and others.

Abstract: The present invention relates to new monoclonal antibodies and fragments of these antibodies, which have dual specificity and high affinity for N-acetyl GM3 and N-glycolyl GM3 and do not recognize other gangliosides. In another aspect, the present invention relates to the use of these antibodies and their fragments in the therapy of tumors characterized by a significant expression of any of the two antigens recognized by these antibodies, or a mixed expression of both antigens. Likewise, the invention relates to the use of these antibodies in the diagnosis of tumors expressing at least one of the two variants of the GM3 ganglioside.

Abstract: The present invention reveals human recombinant antibodies that recognize the human Vascular Endothelium Growth Factor A (VEGF-A), block its interaction with the VEGFR2 receptor, and interfere with its proliferative effect in vitro and pro-angiogenic effect in vivo. The antibodies identify an epitope on human VEGF-A different from any other previously reported, and were obtained by combining one immunoglobulin light chain variable region with other three heavy chain ones. The antibodies were obtained by human immunoglobulin variable region mutagenesis, and can be employed for the immunotherapy of pathological entities associated with to an increase in vasculature, such as age-related macular degeneration, cancer, and others.

Abstract: The present invention deals with recombinant polypeptide molecules related to antibodies, that specifically recognize the human Vascular Endothelial Growth Factor A (VEGF-A), and interfere with its in vitro stimulatory effects and pro-angiogenic activity in vivo. These recombinant polypeptide molecules affect proliferation of human endothelial cells in vitro, subcutaneous angiogenesis in mice induced by Matrigel pellets that contain VEGF-A and the growth of human tumors transplanted in nude athymic mice. Several of these moleculas prevent choroideal neovascularization in a non human primate experimental model.