title: Potential of microsensor-based feedback bioactuators for biophysical cancer treatment.
abstract: Solid tumors usually exhibit a poorly organized vascularization and a deviant energy metabolism which result in an acidic pH and large hypoxic areas in the tumor microenvironment. A lot of cell biological data support the hypothesis that such physico-chemical conditions are promoters of the microevolution of malignant cells, inhibitors of the immune response, and co-factors for tumor cell invasion. Our experimental in vitro analyses and computer simulations indicate that the efficiency of immunotherapies and classical methods for cancer treatment might be improved if a physico-chemical microenvironment could be restored which reflects that found in normal tissue. In order to monitor and manipulate the tumor microenvironment, we suggest utilizing silicon-based feedback bioactuators which are controlled by on-line microsensors. These miniaturized bioactuators play the role of 'pH clamps' and can be implanted directly at the sites of inoperable tumors and metastases where they can reconstitute normal physico-chemical conditions. The drug application scheme can be precisely controlled by an integrated microprocessor. The paper summarizes the current state of development of such microsensor-based feedback bioactuators and outlines their potential for biophysical cancer treatment.
authors.affiliation: Institut für Immunbiologie, Albert-Ludwigs-Universität Freiburg, Germany.
authors.forename: B
authors.initials: B
authors.lastname: Wolf
authors.forename: M
authors.initials: M
authors.lastname: Kraus
authors.forename: U
authors.initials: U
authors.lastname: Sieben
mesh_terms: D000222:Adaptation, Physiological; D000818:Animals; D000917:Antibody Formation; D055592:Biophysical Phenomena; D001703:Biophysics; D015374:Biosensing Techniques; D005246:Feedback; D006801:Humans; D009361:Neoplasm Invasiveness; D009369:Neoplasms / Q000276:immunology / Q000473:pathology / Q000628:therapy*; D009374:Neoplasms, Experimental / Q000276:immunology / Q000473:pathology / Q000628:therapy*