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  • 1
    Electronic Resource
    Electronic Resource
    NMR characteristics of intracellular potassium in the rat salivary gland: a potassium-39 NMR study using double-quantum filtering (1990)
    s.l. : American Chemical Society
    Biochemistry 29 (1990), S. 599-603 
    Details
    ISSN: 1520-4995
    Source: ACS Legacy Archives
    Topics: Biology , Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/bi00455a001
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  • 2
    Electronic Resource
    Electronic Resource
    Enhancing effect of mouse peritoneal exudate cells and their products on antibody productivity of hybridoma cells: Application of in vivo factors to in vitro culture (1991)
    Springer
    Cytotechnology 7 (1991), S. 93-101 
    Details
    ISSN: 1573-0778
    Keywords: hybridoma culture ; interleukins ; monoclonal antibody productivity ; peritoneal exudate cells
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Abstract Mouse peritoneal exudate cells induced by casein enhanced in vitro antibody production rate per cell of a hybridoma in co-culture. Culture supernatant of the exudate cells also enhanced three-fold the antibody productivity when added to cultures of a hybridoma at 10% (v/v). Hence the enhancement of antibody productivity by the exudate cells seemed to be caused by soluble enhancing factors secreted by the exudate cells. The exudate cells maximally secreted the enhancing factors when harvested from mice on day 4 of the induction period following the injection of casein. A semi-continuous culture of the hybridoma demonstrated the applicability of the culture supernatant to enhance antibody production by producing a two-fold increase over the control for seven days when supplemented with the supernatant at 5%. Significant amounts of interleukin-6 were detected in culture supernatant of the exudate cells. Interleukin-6 obtained from other sources enhanced the antibody productivity two-fold when added to the hybridoma culture at the concentration of 5 unit/ml. Interleukin-6, therefore, is expected to be one of the principal antibody enhancing factors secreted by the exudate cells. Other interleukins examined, that is, interleukin-1 to-5 did not enhance the antibody productivity.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00350915
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  • 3
    Electronic Resource
    Electronic Resource
    Interleukin-6 is antiproliferative to a mouse hybridoma cell line and promotive for its antibody productivity (1992)
    Springer
    Cytotechnology 10 (1992), S. 15-23 
    Details
    ISSN: 1573-0778
    Keywords: antibody productivity ; growth suppression ; hybridoma ; interleukin-6 ; specific productivity
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Abstract Monoclonal antibody production by hybridoma cells at moderately slowed growth states would be favorable for commercial scale production since cells can devote their resources to performing the differentiated function, immunoglobulin production. We found that a purified recombinant human interleukin-6, which had been reported to support or stimulate proliferation of B cell hybridoma/plasmacytoma cells, suppressed growth of a hybridoma cell line in serum-free medium. In the presence of the interleukin, the growth-suppressed cells were viable for remarkably long periods in batch culture, and after removal of the interleukin from the culture medium, they started to proliferate at their normal growth rate. As the concentration of the interleukin increased in the culture, the growth rate decreased and the specific antibody productivity (antibody production rate per cell) increased to 5-fold of control at 10 U ml−1 (2 ng ml−1) of the interleukin.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00376096
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  • 4
    Electronic Resource
    Electronic Resource
    Growth rate suppression of cultured mammalian cells enhances protein productivity (1994)
    Springer
    Cytotechnology 15 (1994), S. 57-64 
    Details
    ISSN: 1573-0778
    Keywords: Enhancement of protein production ; growth suppression ; cell differentiation ; mammalian cell culture ; mRNA stability
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Abstract Suppression of proliferation of cells which contain stable or stabilized mRNA coded for a protein to be produced, a partial mimic of cell differentiation, was examined for enhancing protein production by cultured mammalian cells. Hybridoma 2E3 cells which were adapted to be interleukin-6 sensitively growth-suppressed accumulated the mRNA of IgG1 which is reported stable, and IgG1 production rate increased as a result when their growth was suppressed with interleukin-6. A myeloma cell line was similarly adapted; the obtained myeloma cells can be used as host cells for enhancing production of exogenous proteins by suppressing growth with interleukin-6. Temperature-sensitively growth-suppressible mutants of mouse mammary carcinoma FM3A were transfected with cDNA of IgM λ1 chain and cultured at nonpermissive temperature to enhance production of λ1. Addition of various growth-suppressive reagents to culture medium was studied for finding methods suitable for suppressing growth while maintaining high cell viability. Caffeine yielded the best results among these reagents. Deprivation of various growth-supporting components in culture medium was also tested; simultaneous deprivation of insulin and transferrin viably suppressed growth of hybridoma 2E3 cells, resulting in enhanced antibody productivity.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00762379
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  • 5
    Electronic Resource
    Electronic Resource
    Identification of a genomic region that complements a temperature-sensitive, high CO2-requiring mutant of the cyanobacterium, Synechococcus sp. PCC7942 (1991)
    Springer
    Molecular genetics and genomics 226 (1991), S. 401-408 
    Details
    ISSN: 1617-4623
    Keywords: Complementation analysis ; Cyanobacteria ; DNA transformation ; Inorganic carbon transport ; hotosynthetic CO2 fixation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary In a temperature-sensitive, high CO2-requiring mutant of Synechococcus sp. PCC7942, the ability to fix intracellularly accumulated inorganic carbon was severely impaired at non-permissive temperature (41° C). In contrast, inorganic carbon uptake and ribulose-1,5-bisphosphate carboxylase activity in the mutant were comparable to the respective values obtained with the wild-type strain. The mutant was transformed to the wild-type phenotype (ability to form colonies at non-permissive temperature under ordinary air) with the genomic DNA of the wild-type strain. A clone containing a 36 kb genomic DNA fragment of the wild-type strain complemented the mutant phenotype. The complementing activity region was associated with internal 17 kb SmaI, 15 kb HindIII, 3.8 kb BamHI and 0.87 kb Pstl fragments. These 4 fragments overlapped only in a 0.4 kb HindIII-PstI region. In the transformants obtained with total genomic DNA or a plasmid containing the 3.8 kb BamHI fragment, the ability to fix intracellular inorganic carbon was restored. Southern hybridization and partial nucleotide sequence analysis indicated that the cloned genomic region was located approximately 20 kb downstream from the structural genes for subunits of ribulose-1,5-bisphosphate carboxylase/oxygenase. The cloned region was transcribed into a 0.5 kb mRNA. These results indicate that the cloned genomic region of Synechococcus sp. PCC7942 is involved in the efficient utilization of intracellular inorganic carbon for photosynthesis.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00260652
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    Paper (German National Licenses)
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