Altered folate-binding protein mRNA stability in KB cells grown in folate-deficient medium.

Abstract:

:Folate-binding protein (FBP), a high-affinity folate receptor, is responsible for cellular accumulation of folate and folate analogs such as methotrexate in human KB (nasopharyngeal carcinoma) cells. Both FBP and FBP mRNA increase 3- to 5-fold when KB cells are grown in folate-deficient (less than 10 nM folate) medium (KB-FD), compared with growth in standard folate-replete medium containing at least 2 microM folate (KB-FR). The possible mechanisms of enhanced FBP gene expression in KB-FD were examined in this study. Southern blot analysis revealed no significant change in the FBP gene organization or copy number in the KB-FD DNA. While hypomethylation of the FBP gene was observed in KB-FD DNA, relative to KB-FR DNA, exposure of KB-FR to the DNA methylation inhibitors did not result in elevated FBP mRNA levels. The transcriptional rate of the FBP gene was the same in KB-FR and KB-FD. RNA half-life studies indicated that the half-life of FBP mRNA in KB-FD was increased approximately 2.5-fold, compared with KB-FR. Thus, the increase in the steady-state levels of FBP mRNA in KB-FD can be attributed partly to increased FBP mRNA stability.

journal_name

Biochem Pharmacol

journal_title

Biochemical pharmacology

authors

Hsueh CT,Dolnick BJ

doi

10.1016/0006-2952(93)90235-o

subject

Has Abstract

pub_date

1993-06-22 00:00:00

pages

2537-45

issue

12

eissn

0006-2952

issn

1873-2968

pii

0006-2952(93)90235-O

journal_volume

45

pub_type

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