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In various cellular subfractions of Calendula officinalis leaves a study was made of the distribution of polyprenyl quinones and α-tocopherol and the dynamics of their labelling with 14CO2 and acetate-[1-14C] and incorporation of mevalonate-[2-14C] after 3 hr. It was confirmed that plastoquinone occurs only in the chloroplasts, ubiquinone only in the mitochondria and α-tocopherol in both these subfractions. Phylloquinone was found in the chloroplast and mitochondrial fractions as well as in the post-mitochondrial supernatant. Studies of the dynamics of radioactive precursor incorporation indicated that α-tocopherol is metabolized more rapidly than the polyprenyl quinones studied; the incorporation of mevalonate-[2-14C] suggests that the side chain of plastoquinone can be synthesized in the cytoplasm and transported to the chloroplasts. 相似文献
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S Sawada R J Pillarisetty J P Michalski D W Palmer N Talal 《Journal of immunology (Baltimore, Md. : 1950)》1977,119(1):355-360
Splenic lymphocytes from both normal and autoimmune mice bind significant quantities of polyriboadenylic acid (poly rA) when incubated with radiolabeled poly rA for 40 min at 37 degrees C. This poly rA binding is specifically inhibited by an excess of nonradioactive poly rA and by anti-mouse immunoglobulin. Poly rA binding is decreased by exposing spleen cells to Pronase and is restored by subsequent culture for 18 to 72 hr. Poly rA-binding activity is associated more with bone marrow-derived than with thymus-derived lymphocytes. These results suggest the presence of autoantigen-binding lymphocytes in normal as well as autoimmune mice. Furthermore, spleen cells from normal and autoimmune mice cultured for 72 hr synthesize and secrete antibodies to poly rA and DNA. These antibodies can be recovered from the culture supernatants by a solid immunoadsorbent technique and antibody immunoprecipitation. The synthesis of antibodies to nucleic acids by normal spleen cells suggests that autoreactive lymphocytes may be released from normal immunoregulatory control during in vitro culture conditions. 相似文献
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Sjoerd P Niehof Frank JPM Huygen Rick WP van der Weerd Mirjam Westra Freek J Zijlstra 《Biomedical engineering online》2006,5(1):30