J Korean Med Sci.  2002 Feb;17(1):41-48. 10.3346/jkms.2002.17.1.41.

FKBP-12 Exhibits an Inhibitory Activity on Calcium Oxalate Crystal Growth in Vitro

Affiliations
  • 1Institute for Medical Science and Department of Immunology, School of Medicine, Keimyung University, Taegu, Korea.
  • 2Department of Microbiology, School of Medicine, Keimyung University, Taegu, Korea.
  • 3Nephrology, Department of Medicine, Pritzker School of Medicine, University of Chicago, Chicago, IL60637, USA.
  • 4Institute for Medical Science, Kosin University College of Medicine, Pusan, Korea. bkchoe@ns.kosinmed.or.kr
  • 5Department of Internal Medicine, School of Medicine, Youngnam University, Taegu, Korea.

Abstract

Urolithiasis and calcium oxalate crystal deposition diseases are still significant medical problems. In the course of nephrocalcin cDNA cloning, we have identified FKBP-12 as an inhibitory molecule of calcium oxalate crystal growth. lambdagt 11 cDNA libraries were constructed from renal carcinoma tissues and screened for nephrocalcin cDNA clones using anti-nephrocalcin antibody as a probe. Clones expressing recombinant proteins, which appeared to be antigenically cross-reactive to nephrocalcin, were isolated and their DNA sequences and inhibitory activities on the calcium oxalate crystal growth were determined. One of the clone lambdagt 11 #31-1 had a partial fragment (80 bp) of FKBP-12 cDNA as an insert. Therefore, a full-length FKBP-12 cDNA was PCR-cloned from the lambdagt 11 renal carcinoma cDNA library and was subcloned into an expression vector. The resultant recombinant FKBP-12 exhibited an inhibitory activity on the calcium oxalate crystal growth (Kd=10(-7) M). Physiological effect of the extracellular FKBP-12 was investigated in terms of macrophage activation and proinflammatory cytokine gene induction. Extracellular FKBP-12 failed to activate macrophages even at high concentrations. FKBP-12 seems an anti-stone molecule for the oxalate crystal deposition disease and recurrent stone diseases.

Keyword

Tacrolimus Binding Protein 1A; Calcium Oxalate; Growth Inhibitor; Nephrocalcin; Anti-stone agent

MeSH Terms

Animals
Base Sequence
Calcium Oxalate/*antagonists & inhibitors
Carcinoma, Renal Cell
Crystallization
DNA, Complementary
Extracellular Space
Glycoproteins/genetics
Humans
Kidney Calculi/*prevention & control
Kidney Neoplasms
Male
Mice
Mice, Inbred ICR
Molecular Sequence Data
Recombinant Fusion Proteins/genetics/metabolism
Tacrolimus Binding Protein 1A/genetics/*metabolism
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