In addition to suppressing cholesterol synthesis and uptake, oxysterols also activate glycerophospholipid and SM (sphingomyelin) synthesis, possibly to buffer cells from excess sterol accumulation. In the present study, we investigated the effects of oxysterols on the CDP-choline pathway for PtdCho (phosphatidylcholine) synthesis using wild-type and sterol-resistant CHO (Chinese-hamster ovary) ...

Based on a detailed metabolic network of CHO-320 cells built using available information gathered from published reports, the flux distribution can be evaluated using tools of positive linear algebra (in particular, the algorithm METATOOL devised in T. Pfeiffer and Schuster (1999); S. Schuster (1999)), and to study the influence of the interconnection level of the network as well as the availab...

Introduction Expression of recombinant antibodies in CHO cells is a state-of-the-art procedure in research and industry. Generation of cell lines producing high amounts of antibodies is one of the major tasks to increase process efficiency. The establishment of clones is often achieved by methotrexate (MTX)–mediated gene amplification in CHO-DG44 cells. Evaluation of MTX-mediated amplification ...

We have isolated, following one-step mutagenesis, a Chinese hamster ovary cell mutant hypersensitive to the intercalating agent, adriamycin (4-fold compared to parental CHO-K1 cells). This agent exerts at least part of its cytotoxic action via inhibition of the nuclear enzyme, topoisomerase II. The mutant, designated ADR-3, showed hypersensitivity to all classes of topoisomerase II inhibitors, ...

Chinese hamster ovary (CHO) cells have become the most widely utilized mammalian cell line for the production of recombinant proteins. However, the product yield and transgene instability need to be further increased and solved. In this study, we investigated the effect of five different introns on transgene expression in CHO cells. hCMV intron A, adenovirus tripartite leader sequence intron, S...

Xeroderma pigmentosum (XP) is an autosomal recessive human disease, characterized by an extreme sensitivity to sunlight, caused by the inability of cells to repair UV light-induced damage to DNA. Cell fusion was used to transfer fragments of Chinese hamster ovary (CHO) chromosomes into XP cells. The hybrid cells exhibited UV resistance and DNA repair characteristics comparable to those expresse...