Regulation of Cell Growth by IRF-1 in BHK-21 Cells

Overview

Journal Cytotechnology

Specialties Biotechnology
Genetics

Date 2012 Feb 24

PMID 22358925

Citations 6

Authors

S Kirchhoff

A Kroger

H Cruz

M Tummler

F Schaper

M Koster

H Hauser

Affiliations

Soon will be listed here.

Abstract

Most cell lines that are used for the production of recombinant proteins proliferate spontaneously at a high rate. In many types of cultivation systems these cells still keep growing after having reached the desired cell density. Further proliferation in batch cultures leads to cell death as a consequence of nutrient and oxygen depletion as well as to accumulation of lactate and toxic products. Consequently, in many technical processes, the surplus of cells is removed.We have established cell lines in which proliferation is controlled by a physiological regulator, IRF-1. IRF-1 (Interferon Regulatory Factor 1) is a transcriptional activator and acts as a tumor suppressor. Constitutive overexpression of recombinant IRF-1 leads to inhibition of cell growth. The extent of this growth arrest depends on the intracellular concentration of active IRF-1. To allow IRF-1 expression in various mammalian cells a system for conditional IRF-1 activation has been established. A fusion protein composed of IRF-1 and the hormone binding domain of the human estrogen receptor, was used. This system allows to control gradually the growth of several mammalian cell lines by adjusting the intracellular concentration of active IRF-1 via estradiol in the medium. We have evaluated BHK-21 cells with respect to IRF-1 mediated cell growth inhibition and expression of two secreted proteins. Whereas the productivity of proliferation inhibited cells with respect to constitutively transcribed IgG genes is reduced, productivity of another secreted protein which is controlled by an IRF-1 inducible promoter is strongly enhanced under these conditions.

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