Jan 1, 1976

Properties of guanylate cyclase from rat kidney cortex and transplantable kidney tumors

Journal of Cyclic Nucleotide Research
W E CrissH Kimura


The subcellular distribution and properties of guanylate cyclase was examined in preparations of normal rat renal cortex and Morris renal tumors MK2 and MK3. In normal kidney cortex about two-thirds of guanylate cyclase activity of homogenates was found in soluble fractions. With renal tumors the homogenate activity was less and the enzyme was equally divided between particulate and soluble fractions. The particulate enzyme in kidney cortex and tumors was associated with all particulate fractions. Triton X-100 increased the activity of all preparations. All preparations preferred Mn2+ as the sole cation. The stimulatory effects of Ca2+ on soluble enzyme and inhibitory effects on particulate activity were similar with preparations of renal cortex and tumors. ATP inhibited all preparations. Soluble and particulate guanylate cyclases from renal cortex were activated several-fold with 1 mM NaN3. Preparations of tumor enzymes did not respond to NaN3. Thus, compared to normal renal cortex the subcellular distribution of guanylate cyclase and some of its properties are altered in preparations of renal tumors.

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Mentioned in this Paper

Adrenal Cortex Diseases
Enzymes, antithrombotic
Entire Cortex of Kidney
Kidney Neoplasm
Guanylate Cyclase Activity
Structure of Cortex of Kidney

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