title: Changes in intracellular ATP-content of CHO cells as response to hyperosmolality.
abstract: A variety of approaches has been published to enhance specific productivity (qp) of recombinant Chinese hamster ovary (CHO) cells. Changes in culture conditions, e. g. temperature shifts, sodium butyrate treatment and hyperosmolality, were shown to improve qp . To contribute to a better understanding of the correlation between hyperosmolality and enhanced qp , we analyzed cellular kinetics and intracellular adenine nucleotide pools during osmotic shift periods. Known phenotypes like increased formation rates for lactate and product (anti-IL-8 antibody; qlactate, qp) as well as increased cell specific uptake rate for glucose (qglucose ) were found--besides inhibition of cell growth and G1-arrest occurred during batch cultivations with osmotic shift. The analysis of intracellular AXP pools revealed enlarged ATP amounts for cells as response to hyperosmolality while energy charges remained unchanged. Enhanced ATP-pools coincided with severely increased ATP formation rates (qATP ) which outweighed by far the putative requirements attributed to regulatory volume increase. Therefore elevated qATP mirrored an increased cellular demand for energy while experiencing hyperosmotic shift.
authors.affiliation: The Inst. of Biochemical Engineering, University of Stuttgart, Stuttgart, 70569, Germany.
authors.forename: Jennifer
authors.initials: J
authors.lastname: Pfizenmaier
authors.affiliation: The Inst. of Biochemical Engineering, University of Stuttgart, Stuttgart, 70569, Germany.
authors.forename: Jens-Christoph
authors.initials: JC
authors.lastname: Matuszczyk
authors.affiliation: The Inst. of Biochemical Engineering, University of Stuttgart, Stuttgart, 70569, Germany.
authors.forename: Ralf
authors.initials: R
authors.lastname: Takors
mesh_terms: D000255:Adenosine Triphosphate / Q000378:metabolism*; D000818:Animals; D016466:CHO Cells / Q000201:enzymology*; D049109:Cell Proliferation; D006224:Cricetinae; D003412:Cricetulus; D003593:Cytoplasm / Q000378:metabolism*; D005947:Glucose / Q000378:metabolism; D019344:Lactic Acid / Q000378:metabolism; D009994:Osmolar Concentration; D011994:Recombinant Proteins / Q000096:biosynthesis
chemical_list: D011994:Recombinant Proteins; D019344:Lactic Acid; D000255:Adenosine Triphosphate; D005947:Glucose
keywords: ATP; energy charge; hyperosmolality