Abstract |
Development of novel therapies for polycystic kidney disease (PKD) requires assays that adequately reflect disease biology and are adaptable to high-throughput screening. Here we describe an embryonic cystic kidney organ culture model and demonstrate that a new mutant allele of the Pkd1 gene (Pkd1(tm1Bdgz)) modulates cystogenesis in this model. Cyst formation induced by cAMP is influenced by the dosage of the mutant allele: Pkd1(tm1Bdgz) -/- cultures develop a larger cystic area compared with +/+ counterparts, while Pkd1(tm1Bdgz) +/- cultures show an intermediate phenotype. A similar relationship between the degree of cystogenesis and mutant gene dosage is seen in cystic kidney organ cultures derived from mice with a mutated Nek8 gene (Nek8(jck)). Both Pkd1- and Nek8- cultures display altered cell-cell junctions, with reduced E-cadherin expression and altered desmosomal protein expression, similar to ADPKD epithelia. Additionally, characteristic ciliary abnormalities are identified in cystic kidney cultures, with elevated ciliary polycystin 1 expression in Nek8 homozygous cultures and elevated ciliary Nek8 protein expression in Pkd1 homozygotes. These data suggest that the Nek8 and Pkd1 genes function in a common pathway to regulate cystogenesis. Moreover, compound Pkd1 and Nek8 heterozygous adult mice develop a more aggressive cystic disease than animals with a mutation in either gene alone. Finally, we validate the kidney organ culture cystogenesis assay as a therapeutic testing platform using the CDK inhibitor roscovitine. Therefore, embryonic kidney organ culture represents a relevant model for studying molecular cystogenesis and a rapid tool for the screening for therapies that block cystic growth.
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Authors | Thomas A Natoli, Tiffany C Gareski, William R Dackowski, Laurie Smith, Nikolay O Bukanov, Ryan J Russo, Hervé Husson, Douglas Matthews, Peter Piepenhagen, Oxana Ibraghimov-Beskrovnaya |
Journal | American journal of physiology. Renal physiology
(Am J Physiol Renal Physiol)
Vol. 294
Issue 1
Pg. F73-83
(Jan 2008)
ISSN: 1931-857X [Print] United States |
PMID | 17928412
(Publication Type: Journal Article)
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Chemical References |
- Cadherins
- Protein Kinase Inhibitors
- Purines
- TRPP Cation Channels
- polycystic kidney disease 1 protein
- Roscovitine
- Protein Kinases
- NIMA-Related Kinases
- Nek8 protein, mouse
- Protein Serine-Threonine Kinases
- Cyclin-Dependent Kinases
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Topics |
- Alleles
- Animals
- Cadherins
(metabolism)
- Cell Adhesion
(genetics, physiology)
- Cilia
(drug effects, metabolism)
- Cyclin-Dependent Kinases
(antagonists & inhibitors)
- Cysts
(metabolism, physiopathology)
- Disease Models, Animal
- Female
- Male
- Mice
- Mice, Knockout
- Mutation
(genetics)
- NIMA-Related Kinases
- Organ Culture Techniques
- Polycystic Kidney Diseases
(metabolism, physiopathology)
- Protein Kinase Inhibitors
(pharmacology)
- Protein Kinases
(genetics, metabolism)
- Protein Serine-Threonine Kinases
- Purines
(pharmacology)
- Roscovitine
- TRPP Cation Channels
(metabolism)
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