Renal accumulation and excretion of cyclic adenosine monophosphate in a murine model of slowly progressive polycystic kidney disease

Tamio Yamaguchi, Shizuko Nagao, Masao Kasahara, Hisahide Takahashi, Jared J. Grantham

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Abstract

Evidence from in vitro studies indicates that increased proliferation of epithelial cells and secretion of fluid by these cells may be important factors in the progressive enlargement of renal cysts. The rate of cellular proliferation and fluid secretion by cyst epithelium in vitro can be strikingly accelerated by cyclic adenosine 3'5' monophosphate (cAMP) and agonists that lead to the production of this nucleotide. The extent to which renal cAMP content is increased in polycystic kidneys is unknown. In the current study, we determined the amount of this nucleotide in intact kidneys, cyst fluid, plasma, and urine in nonazotemic mice (DBA/2FG-pcy/pcy) with a slowly progressive form of inherited polycystic kidney disease (PKD). In 45 pcy/pcy mice studied 20, 45, or 70 days after birth, the total kidney cAMP content was 0.22 ± 0.01, 0.46 ± 0.02, and 0.90 ± 0.05 pmol/mg tissue, respectively. By contrast, in 37 control DBA/2J mice the levels of cAMP at identical times remained relatively constant at 0.22 2+ 0.01, 0.21 ± 0.01, and 0.29 ± 0.01 pmol/mg tissue, respectively. In 70-day-old nonazotemic pcy/pcy mice with normal serum levels of parathyroid hormone, cAMP generated by the kidneys (nephrogenous cAMP) was 22.9 ± 2.8 nmol/100 mL creatinine clearance, compared with 6.5 ± 1.3 in normal animals of the same age (P < 0.001). The cyst fluids of 70-day-old pcy/pcy mice contained a lipid that increased transepithelial secretion of fluid by MDCK monolayers from a baseline of 0.012 ± 0.002 to 0.136 ± 0.008 μL/cm2/hr (P < 0.05). This lipid also stimulated cellular proliferation by monolayers of cultured MDCK and LLC-PK1 cells 2.5- and 7.9-fold (P < .05), respectively, and stimulated cAMP accumulation by these cells 1.6- and 2.0-fold (P < .05), respectively. These studies illustrate that renal cAMP production and excretion increase in concert with the cystic enlargement of the kidneys in DBA/2FG-pcy/pcy mice and identify a lipid cAMP agonist in murine renal cystic kidney disease.

Original languageEnglish
Pages (from-to)703-709
Number of pages7
JournalAmerican Journal of Kidney Diseases
Volume30
Issue number5
DOIs
Publication statusPublished - 01-01-1997

Fingerprint

Polycystic Kidney Diseases
Cyclic AMP
Adenosine
Kidney
Fluids and Secretions
Cystic Kidney Diseases
Cyst Fluid
Inbred DBA Mouse
Lipids
Cysts
Nucleotides
Cell Proliferation
LLC-PK1 Cells
Renal Elimination
Parathyroid Hormone
Creatinine
Epithelium
Epithelial Cells
Urine
Parturition

All Science Journal Classification (ASJC) codes

  • Nephrology

Cite this

Yamaguchi, Tamio ; Nagao, Shizuko ; Kasahara, Masao ; Takahashi, Hisahide ; Grantham, Jared J. / Renal accumulation and excretion of cyclic adenosine monophosphate in a murine model of slowly progressive polycystic kidney disease. In: American Journal of Kidney Diseases. 1997 ; Vol. 30, No. 5. pp. 703-709.
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abstract = "Evidence from in vitro studies indicates that increased proliferation of epithelial cells and secretion of fluid by these cells may be important factors in the progressive enlargement of renal cysts. The rate of cellular proliferation and fluid secretion by cyst epithelium in vitro can be strikingly accelerated by cyclic adenosine 3'5' monophosphate (cAMP) and agonists that lead to the production of this nucleotide. The extent to which renal cAMP content is increased in polycystic kidneys is unknown. In the current study, we determined the amount of this nucleotide in intact kidneys, cyst fluid, plasma, and urine in nonazotemic mice (DBA/2FG-pcy/pcy) with a slowly progressive form of inherited polycystic kidney disease (PKD). In 45 pcy/pcy mice studied 20, 45, or 70 days after birth, the total kidney cAMP content was 0.22 ± 0.01, 0.46 ± 0.02, and 0.90 ± 0.05 pmol/mg tissue, respectively. By contrast, in 37 control DBA/2J mice the levels of cAMP at identical times remained relatively constant at 0.22 2+ 0.01, 0.21 ± 0.01, and 0.29 ± 0.01 pmol/mg tissue, respectively. In 70-day-old nonazotemic pcy/pcy mice with normal serum levels of parathyroid hormone, cAMP generated by the kidneys (nephrogenous cAMP) was 22.9 ± 2.8 nmol/100 mL creatinine clearance, compared with 6.5 ± 1.3 in normal animals of the same age (P < 0.001). The cyst fluids of 70-day-old pcy/pcy mice contained a lipid that increased transepithelial secretion of fluid by MDCK monolayers from a baseline of 0.012 ± 0.002 to 0.136 ± 0.008 μL/cm2/hr (P < 0.05). This lipid also stimulated cellular proliferation by monolayers of cultured MDCK and LLC-PK1 cells 2.5- and 7.9-fold (P < .05), respectively, and stimulated cAMP accumulation by these cells 1.6- and 2.0-fold (P < .05), respectively. These studies illustrate that renal cAMP production and excretion increase in concert with the cystic enlargement of the kidneys in DBA/2FG-pcy/pcy mice and identify a lipid cAMP agonist in murine renal cystic kidney disease.",
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Renal accumulation and excretion of cyclic adenosine monophosphate in a murine model of slowly progressive polycystic kidney disease. / Yamaguchi, Tamio; Nagao, Shizuko; Kasahara, Masao; Takahashi, Hisahide; Grantham, Jared J.

In: American Journal of Kidney Diseases, Vol. 30, No. 5, 01.01.1997, p. 703-709.

Research output: Contribution to journalArticle

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