alexa c-myc antisense oligonucleotide treatment ameliorates murine ARPKD.
Genetics & Molecular Biology

Genetics & Molecular Biology

Journal of Genetic Syndromes & Gene Therapy

Author(s): Ricker JL, Mata JE, Iversen PL, Gattone VH

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Abstract BACKGROUND: Overexpression of c-myc is postulated to play a role in the pathogenesis of polycystic kidney disease (PKD). c-myc expression is increased in all rodent models of PKD that have been examined as well as in human ADPKD. To determine whether overexpression of renal c-myc contributes to renal cyst formation, C57BL/6J-cpk litters (an animal model of ARPKD) were treated with an antisense oligomer (ASO) to c-myc mRNA. METHODS: Injections of 30 microg of a c-myc ASO were given to C57BL/6J-cpk litters on postnatal days 7-20. Control mice received either sham injections or injections of an equal amount of a scrambled ASO. At 20 days, kidney weight, body weight, serum urea nitrogen (SUN), hematocrit, and renal concentration of ASO were determined. In kidney, c-Myc and PCNA protein were assessed by immunoblotting and steady state levels of renal RNA for c-myc, EGF, SGP-2, and histone H4 were assessed by northern blot hybridization. c-Myc and PCNA proteins were localized by immunohistochemistry. RESULTS: Cystic mice treated with the c-myc ASO had a decreased relative kidney weight, improved renal function, and a reduced amount of cystic change compared with sham and scrambled ASO controls. The abnormal expression of several PKD related proteins and mRNAs were partially reversed by c-myc antisense treatment. c-myc staining appeared to be reduced in the noncystic tubules. Treatment with the c-myc ASO did not cause a reduction in hematocrit or total body weight indicating that the beneficial effects were not due to a generalized inhibition of cell proliferation in rapidly growing tissue. CONCLUSIONS: c-Myc appears to play a role in the cystogenesis of cpk-induced murine PKD and antisense targeting the overexpression of c-myc partially ameliorated the renal changes. This article was published in Kidney Int and referenced in Journal of Genetic Syndromes & Gene Therapy

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