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Transcriptional profiling of apoptotic pathways in batch and fed‐batch CHO cell cultures
Author(s) -
Wong Danny Chee Furng,
Wong Kathy Tin Kam,
Lee Yih Yean,
Morin Peter Nissom,
Heng Chew Kiat,
Yap Miranda Gek Sim
Publication year - 2006
Publication title -
biotechnology and bioengineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.136
H-Index - 189
eISSN - 1097-0290
pISSN - 0006-3592
DOI - 10.1002/bit.20872
Subject(s) - apoptosis , chinese hamster ovary cell , microbiology and biotechnology , biology , viability assay , programmed cell death , signal transduction , gene expression profiling , cell culture , caspase , gene , gene expression , genetics
Chinese Hamster ovary (CHO) cells are regarded as one of the “work‐horses” for complex biotherapeutics production. In these processes, loss in culture viability occurs primarily via apoptosis, a genetically controlled form of cellular suicide. Using our “in‐house” developed CHO cDNA array and a mouse oligonucleotide array for time profile expression analysis of batch and fed‐batch CHO cell cultures, the genetic circuitry that regulates and executes apoptosis induction were examined. During periods of high viability, most pro‐apoptotic genes were down‐regulated but upon loss in viability, several early pro‐apoptotic signaling genes were up‐regulated. At later stages of viability loss, we detected late pro‐apoptotic effector genes such as caspases and DNases being up‐regulated. This sequential regulation of apoptotic genes showed that DNA microarrays could be used as a tool to study apoptosis. We found that in batch and fed‐batch cultures, apoptosis signaling occurred primarily via death receptor‐ and mitochondria‐mediated signaling pathways rather than endoplasmic reticulum‐mediated signaling. These insights provide a greater understanding of the regulatory circuitry of apoptosis during cell culture and allow for subsequent targeting of relevant apoptosis signaling genes to prolong cell culture. © 2006 Wiley Periodicals, Inc.