Therapeutic antibodies are instrumental in improving the treatment outcome for certain disease conditions. However, to enhance their efficacy and specificity, many efforts are continuously made. One of the approaches that are increasingly explored in this field are pH-responsive antibodies capable of binding target antigens in a pH-dependent manner. We reviewed suitability and examples of these antibodies that are functionally modulated by the tumor microenvironment. Provided in this review is an update about antigens targeted by pH-responsive, sweeping, and recycling antibodies. Applicability of the pH-responsive antibodies in the engineering of chimeric antigen receptor T-cells (CAR-T) and in improving drug delivery to the brain by the enhanced crossing of the blood–brain barrier is also discussed. The pH-responsive antibodies possess strong treatment potential. They emerge as next-generation programmable engineered biologic drugs that are active only within the targeted biological space. Thus, they are valuable in targeting acidified tumor microenvironment because of improved spatial persistence and reduced on-target off-tumor toxicities. We predict that the programmable pH-dependent antibodies become powerful tools in therapies of cancer.
The present article is a case study of a Polish biopharmaceutical company, “Pure Biologics”. The company was founded in 2010 by a group of scientists and, over the last nine years, grew substantially from just a few individuals to nearly one hundred professionals. Initially, a privately-funded civil partnership, Pure Biologics, has been transformed into a publicly-traded company. Such a transformation has been possible not only because of the expertise and growing experience of corporate management, but also the specific economic environment and substantial public funding dedicated to innovative Small and Medium Enterprises (SMEs).
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