[Show abstract][Hide abstract] ABSTRACT: Rapid immunohistochemistry (R-IHC) can contribute to the intraoperative diagnosis of central nervous system (CNS) tumors. We have recently developed a new IHC method based on an alternating current electric field to facilitate the antigen-antibody reaction. To ensure the requirement of R-IHC for intraoperative diagnosis, 183 cases of CNS tumors were reviewed regarding the accuracy rate of diagnosis without R-IHC. The diagnostic accuracy was 90.7 % (168/183 cases) in which definitive diagnoses were not provided in 17 cases because of the failure of glioma grading and differential diagnosis of lymphoma and glioma. To establish the clinicopathological application, R-IHC for frozen specimens was compared with standard IHC for permanent specimens. 33 gliomas were analyzed, and the Ki-67/MIB-1 indices of frozen specimens by R-IHC were consistent with the grade and statistically correlated with those of permanent specimens. Thus, R-IHC provided supportive information to determine the grade of glioma. For discrimination between glioma and lymphoma, R-IHC was able to provide clear results of CD20 and Ki-67/MIB-1 in four frozen specimens of CNS lymphoma as well as standard IHC. We conclude that the R-IHC for frozen specimens can provide important information for intraoperative diagnosis of CNS tumors.
[Show abstract][Hide abstract] ABSTRACT: In this study, we aim to develop innovative stirring technology (electric field non-contact stirring technique (E.N.S.)) applied abrasive control technique with AC electric field. This technique allows for stirring without contact by applying AC electric field to droplets. We examined observation of fundamental behavior and inside behavior for droplet by AC electric field and investigated the feature of electric field non-contact stirring technique as parameter frequency and voltage, quantitatively. As a result, we found that applied voltage affected magnitude of the attractive force acting on droplet, and the resonant frequency of droplet was greatly affected amount of droplet and bottom diameter of droplet, and there is no increase in the droplet temperature, and the motion speed of particles in droplet was accelerated by this stirring technology.
Journal of the Japan Society for Precision Engineering 01/2014; 80(9):862-866. DOI:10.2493/jjspe.80.862
[Show abstract][Hide abstract] ABSTRACT: We developed a novel ultrarapid immunohistochemical staining method in which an AC electric field is used to facilitate detection of tumor cells. Frozen sections of non-small cell lung cancer in lymph nodes were fixed in acetone for 2 min, after which they were incubated for 2 min with an anti-pancytokeratin antibody cocktail and then with EnVision(TM) complex under an alternating current (AC) electric field. The sections were then incubated with a chromogen (3,3'diaminobenzidine) for 3 min and counterstained with hematoxylin. This method enabled detection of tumor cells in frozen sections in less than 15 min. In addition, we were able to reduce the amount of antibody used by more than 90% when the sections were incubated under the AC electric field for a longer period. This method could be a useful tool for frozen section diagnosis and research. Furthermore, with this method the cost of immunohistochemical staining can be reduced.