Abstract
20-Hydroxyeicosatetraenoic acid (20-HETE) has been implicated as a potential mediator in epithelial cell proliferation and cyst formation in polycystic kidney disease (PKD). In the present study, we studied the effects of chronic blockade of 20-HETE synthesis in an orthologous rodent model of autosomal recessive polycystic kidney disease (ARPKD), the PCK rat. RT-PCR analysis indicated that the expression of CYP4A1, CYP4A2, CYP4A3, and CYP4A8 mRNA was increased two- to fourfold in cystic PCK compared with noncystic Sprague-Dawley rat kidneys. Daily administration of a 20-HETE synthesis inhibitor, HET-0016 (10 mg·kg-1·day-1 ip) for 4-7 wk significantly reduced kidney size by 24% from 4.95 ± 0.19 g in vehicle-treated PCK rats to 3.76 ± 0.15 g (n = 4). Collecting tubule morphometric cystic indices were reduced in HET-0016-treated PCK rats (2.1 ± 0.2; n = 4) compared with vehicle-treated PCK rats (4.4 ± 0.1; n = 4). The cellular mechanism by which 20-HETE may play a role in cyst formation has not been well characterized, but there was a significantly lower (P < 0.05) level of intracellular cAMP and decreased phosphorylation (activation) of ERK1/2 protein in PCK rat kidneys (n = 3) treated with HET-0016. These studies indicate a potential role of 20-HETE in cyst formation in the orthologous rodent PCK model of ARPKD.
| Original language | English (US) |
|---|---|
| Pages (from-to) | F575-F582 |
| Journal | American Journal of Physiology - Renal Physiology |
| Volume | 296 |
| Issue number | 3 |
| DOIs | |
| State | Published - Mar 2009 |
Keywords
- Autosomal recessive polycystic kidney mouse
- Cytochrome P-450
- Epithelial cell proliferation
- HET-0016
- Pck
- Polycystic kidney rat
ASJC Scopus subject areas
- Physiology
- Urology