Kyushu University · Biochemistry, Genetics and Molecular Biology
Professor Masamichi Kamihira's research lab specializes in biotechnological and biochemical engineering, focusing on innovative methods for protein purification, microbial sterilization using supercritical fluids, and tissue engineering. The lab develops advanced separation techniques such as aqueous two-phase systems with functional polymers for selective protein and cell purification, and explores applications in transgenic animal production and regenerative medicine. A key focus is on creating functional biomaterials—like magnetically labeled myoblasts—for engineering three-dimensional, biomimetic tissues with physiological relevance. The lab also investigates the sterilizing potential of supercritical CO₂ for industrial and medical applications, particularly in preserving biological materials without thermal damage.
Figures are computed from collected data and may differ slightly.
The sterilizing effect of supercritical carbon dioxide (SC-C02) is described as compared with gaseous C02(G-C02) and liquid C02(L-C02). Baker’s yeast, Escherichia coli, Staphylococcus aureus and conidia of Aspergillus niger were sterilized by treating with SC-C02 at 200 atm and 35°C when the water content of each microorganism was 70 ~ 90%. However, dry cells with a water content of 2 ~ 10% could not be sterilized under the same conditions. No sterilizing effect from SC-C02 on endospores of Baci
The sterilizing effect of supercritical carbon dioxide (SC-CO2) is described as compared with gaseous CO2(G-CO2) and liquid CO2(L-CO2). Baker's yeast, Escherichia coli, Staphylococcus aureus and conidia'of Aspergillus niger were sterilized by treating with SC-CO2 at 200 atm and 35°C when the water content of each microorganism was 70-90%. However, dry cells with a water content of 2-10% could not be sterilized under the same conditions. No sterilizing effect from SC-CO2 on endospores of Bacillus
We report here the generation of transgenic chickens using a retroviral vector for the production of recombinant proteins. It was found that the transgene expression was suppressed when a Moloney murine leukemia virus-based retroviral vector was injected into chicken embryos at the blastodermal stage. When a concentrated viral solution was injected into the heart of developing embryos after 50 to 60 h of incubation, transgene expression was observed throughout the embryo, including the gonads. F
Abstract A new type of aqueous two‐phase system (ATPS) has been developed in which a temperature‐sensitive polymer, poly‐ N ‐isopropylacrylamide [poly (NIPAM)] was used as a ligand carrier for the specific separation of animal cells. Monoclonal antibodies were modified with itaconic anhydride and copolymerized with N ‐isopropylacrylamide, and the ligand‐conjugated carriers were added to the polyethylene glycol 8000–dextran T500 aqueous two‐phase systems. The antibody–polymer conjugates were part
Aqueous two-phase extraction incorporated affinity precipitation was examined as a technique for protein purification. An enteric coating polymer, Eudragit S100, was employed as a ligand carrier. Eudragit was specifically partitioned to the top phase in the aqueous two-phase systems. For application of this method to purification of recombinant protein A using human IgG coupled to Eudragit in an aqueous two-phase system, 80% of protein A added was recovered with 81% purity. The purity was enhanc
Skeletal muscle tissue engineering is currently applied in a variety of research fields, including regenerative medicine, drug screening, and bioactuator development, all of which require the fabrication of biomimic and functional skeletal muscle tissues. In the present study, magnetite cationic liposomes were used to magnetically label C2C12 myoblast cells for the construction of three-dimensional artificial skeletal muscle tissues by an applied magnetic force. Skeletal muscle functions, such a
The establishment of avian embryonic culture is important both for the analysis of the developmental process and the establishment of transgenic chickens that produce useful biological materials in eggs. However, the hatchability of cultured embryos has been approximately 50%. We identified that the low rate of hatchability of cultured embryos was caused by limited oxygen and calcium availability. In quail embryo culture using chicken eggshell as a culture vessel, viability in the middle stage o
The Cre-loxP system is frequently used for site-specific recombination in animal cells. The equilibrium and specificity of the recombination reaction can be controlled using mutated loxPs. In the present study, we designed an accumulative site-specific gene integration system using Cre recombinase and mutated loxPs in which the Cre-mediated cassette exchange reaction is infinitely repeatable for target gene integration into loxP target sites. To evaluate the feasibility and usefulness of this sy
Animal cell technology is a growing discipline of cell biology which aims not only to understand the structure, function and behavior of differentiated animal cells, but also to ascertain their abilit
The preparation of hepatocyte spheroids by adding a water-soluble synthetic polymer as an artificial matrix was performed in a cell suspension system. Cell-aggregation was promoted without cytotoxicity by adding Eudragit (a copolymer of methacrylic acid and methylmethacrylate) to the culture medium. Spheroid-like cell aggregates, whose liver functions were enhanced, were effectively formed in the presence of 0.1% Eudragit, independent of the cultural substratum. Moreover, the mass preparation of
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