One of the major hurdles of isolating stable, inducible or constitutive high-level producer cell lines is the time-consuming selection procedure. Given the variation in the expression levels of the same construct in individual clones, hundreds of clones must be isolated and tested to identify one or more with the desired characteristics. Various boundary elements (BEs), matrix attachment region...

The Fcgamma receptor IIIb (FcgammaRIIIb) for the Fc domain of IgG is expressed exclusively on neutrophils. The FcgammaRIIIb bears allotypic polymorphisms referred to as NA1, NA2, and SH, which are known for their frequent involvement in alloimmune and autoimmune neutropenias as well as in transfusion reactions. The bactericidal capacity of isolated neutrophils is easily activatable, and activat...

Effective treatment of high-risk neuroblastoma (NB) remains a major challenge in pediatric oncology. Human/mouse chimeric monoclonal anti-GD2 antibody (mAb) ch14.18 is emerging as a treatment option to improve outcome. After establishing a production process in Chinese hamster ovary (CHO) cells, ch14.18/CHO was made available in Europe for clinical trials. Here, we describe validated functional...

The Menkes protein (MNK or ATP7A) is an important component of the mammalian copper transport pathway and is defective in Menkes disease, a fatal X-linked disorder of copper transport. To study the structure and function of this protein and to elucidate its role in cellular copper homeostasis, a cDNA construct encoding the full-length MNK protein was cloned into a mammalian expression vector un...

This study was carried out to develop and characterize mouse monoclonal antibodies (mAbs) against chicken CD25 (chCD25), the alpha chain of the interleukin-2 (IL-2) receptor. A recombinant chimeric chCD25/IgG4 fusion protein was expressed in Chinese hamster ovary (CHO) cells and isolated from spent cell culture medium by protein G affinity chromatography. Purified chCD25 protein was used to imm...

panisons with HeLa cells (22, 23, 29), pig kidney cells (17, 33), V79 cells (16, 36), and CHO cells (7, 20). Some studies also have shown that malignant cells cultured in vitro are more sensitive to heat treatment than the normal cell lines (11, 21, 26, 27). Because of the differences in cellular heat responses among different laboratories, it is difficult to ascertain whether the differential ...

Background Luteinizing hormone (LH) is a heterodimeric glycoprotein composed of alpha and beta subunits.This hormone is secreted from the pituitary gland. LH, in women triggers Menstrual cycle and ovulation. In men, LH stimulates production of testosterone, which plays a specialized role in sperm production. Up to day, LH hormone have produced in different ways such as codon optimization and al...

Intermolecular interaction represents an important theme in regulation of intracellular trafficking of organelles that can be interrupted by competitive overexpression of a relevant molecular domain. We attempted to identify the functional importance of intracellular domains of the cholecystokinin (CCK) receptor by their over-expression in receptor-bearing Chinese hamster ovary (CHO-CCKR) cell ...

Introduction Targeted integration (TI) allows fast and reproducible genetic modification of well characterized previously tagged host cells thus generating producer cells with predictable qualities. Concurrently, timelines are cut by 50% compared to random integration (RI) based cell line development. In contrast to commonly low productivities of cell lines generated by TI, we developed a syste...