Apr 25, 1995

Folate receptor type gamma is primarily a secretory protein due to lack of an efficient signal for glycosylphosphatidylinositol modification: protein characterization and cell type specificity

Biochemistry
F ShenManohar Ratnam

Abstract

A novel isoform of the human folate receptor (FR, type gamma) was recently identified in hematopoietic tissues [Shen et al. (1994) Biochemistry 33, 1209-1215]. In that report, Cos-1 cells, transiently transfected with the cDNA for FR-gamma, produced relatively poor expression of the receptor on the cell surface. In this study, several recombinant Chinese hamster ovary (CHO) cell lines were produced by stable transfection with the cDNA for FR-gamma followed by amplification. Similar recombinant CHO cell lines were produced that expressed the glycosylphosphatidylinositol-(GPI-) anchored FR type beta and a truncated form of FR type beta (FR-beta delta), in which the normal carboxyl-terminal signal for GPI anchor attachment was deleted. Both FR-gamma-and FR-beta delta-expressing CHO cells produced a [3H]folic acid binding protein in the medium with a similar time course over a 24-h period; in contrast to intact FR-beta, relatively insignificant amounts of either FR-gamma or FR-beta delta were associated with the CHO cell surface and this was unaltered by the absence of serum in the medium. The FR-gamma- and FR-beta delta-producing CHO cells did not differ significantly in intracellular FR levels. Furthermore, the mRNA level for FR-...Continue Reading

Mentioned in this Paper

Ovarian Diseases
Folate Receptor 2
Chinese Hamster
Transfection
Fluoride Measurement
Chimeric Proteins, Recombinant
Both Ovaries
Hormone Receptors, Cell Surface
Protoplasm
Proteins, Recombinant DNA

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