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Evidence for a calmodulin inhibitory substance(s) isolated from human meningiomas

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Summary

Calmodulin (CaM), a calcium-binding protein, is present in human tumor tissues and in meningioma. Following a purification procedure using DEAE-cellulose and the polymeric resin 3520, the CaM content of tumor extracts was assayed using CaM-deficient phosphodiesterase (PDE). In the presence of low amounts of the extracts, a concentration dependent stimulation of PDE was observed. However, further addition of higher concentrations of the extract produced a marked inhibition of the CaM stimulation of PDE in 13 of 15 specimens. A wide range (2.44–51.31 units/1 mg tumor [wet weight]) of inhibitor concentration was noted. However, no detectable inhibitory activity of this magnitude was observed in normal human meningeal extracts. The final extracts showed no calcineurin-phosphatase activity in the presence of Ni++, a known activator of this phosphatase. SDS-polyacrylamide gel (10%) electrophoresis of the extracts revealed the typical calmodulin band at 17 kDa plus two additional bands with apparent molecular masses of 21 and 36 kDa respectively. These bands were not seen using normal meningeal extracts.

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Author notes

  1. Shawn D. Antle

    Present address: Dept. of Medicine, St. Louis University, 63110, St. Louis, MO, USA

Authors and Affiliations

  1. Department of Basic Sciences, University of Ill. College of Medicine at Peoria, 61656, Peoria, Ill., USA

    Andrew K. S. Ho

  2. Department of Pathology, University of Ill. College of Medicine at Peoria, 61656, Peoria, Ill., USA

    Uma P. Kalyan-Raman

Authors
  1. Shawn D. Antle
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  2. Andrew K. S. Ho
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  3. Uma P. Kalyan-Raman
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Antle, S.D., Ho, A.K.S. & Kalyan-Raman, U.P. Evidence for a calmodulin inhibitory substance(s) isolated from human meningiomas. J Neuro-Oncol 16, 201–209 (1993). https://doi.org/10.1007/BF01057034

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