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. 1996 Sep 16;15(18):4852–4861.

Underexpression of the 43 kDa inositol polyphosphate 5-phosphatase is associated with cellular transformation.

C J Speed 1, P J Little 1, J A Hayman 1, C A Mitchell 1
PMCID: PMC452223  PMID: 8890159

Abstract

The 43 kDa inositol polyphosphate 5-phosphatase (5-phosphatase) hydrolyses the second messenger molecules inositol 1,4,5-trisphosphate [Ins(1,4,5)P3] and inositol 1,3,4,5-tetrakisphosphate [Ins(1,3,4,5)P4]. We have underexpressed the 43 kDa 5-phosphatase by stably transfecting normal rat kidney cells with the cDNA encoding the enzyme, cloned in the antisense orientation into the tetracycline-inducible expression vector pUHD10-3. Antisense-transfected cells demonstrated a 45% reduction in Ins(1,4,5)P3 5-phosphatase activity in the total cell homogenate upon withdrawal of tetracycline, and an approximately 80% reduction in the detergent-soluble membrane fraction of the cell, as compared with antisense-transfected cells in the presence of tetracycline. Unstimulated antisense-transfected cells showed a concomitant 2-fold increase in Ins(1,4,5)P3 and 4-fold increase in Ins(1,3,4,5)P4 levels. The basal intracellular calcium concentration of antisense-transfected cells (170 +/- 25 nM) was increased 1.9-fold, compared with cells transfected with vector alone (90 +/- 25 nM). Cells underexpressing the 43 kDa 5-phosphatase demonstrated a transformed phenotype. Antisense-transfected cells grew at a 1.7-fold faster rate, reached confluence at higher density and demonstrated increased [3H]thymidine incorporation compared with cells transfected with vector alone. Furthermore, antisense-transfected cells formed colonies in soft agar and tumours in nude mice. These studies support the contention that a decrease in Ins(1,4,5)P3 5-phosphatase activity is associated with cellular transformation.

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Selected References

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