RGD Reference Report - Contribution of cytochrome P450 4A isoforms to renal functional response to inhibition of nitric oxide production in the rat. - Rat Genome Database

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Contribution of cytochrome P450 4A isoforms to renal functional response to inhibition of nitric oxide production in the rat.

Authors: Hercule, HC  Wang, MH  Oyekan, AO 
Citation: Hercule HC, etal., J Physiol. 2003 Sep 15;551(Pt 3):971-9. Epub 2003 Jul 11.
RGD ID: 1625451
Pubmed: PMID:12857783   (View Abstract at PubMed)
PMCID: PMC2343276   (View Article at PubMed Central)
DOI: DOI:10.1113/jphysiol.2003.049981   (Journal Full-text)

20-Hydroxyeicosatetraenoic acid (20-HETE), a major renal eicosanoid, regulates renal function and contributes to renal responses following withdrawal of nitric oxide (NO). However, the role of 20-HETE-synthesizing isoforms in renal function resulting from NO inhibition is unknown. The present study evaluated the role of cytochrome (CYP)4A1, -4A2 and -4A3 isoforms on renal function in the presence and absence of NO. Antisense oligonucleotides (ASODN) to CYP4A1, -4A2 and -4A3 reduced 20-HETE synthesis and downregulated the expression of CYP4A isoforms in renal microsomes. Nomega-L-nitromethyl arginine ester (L-NAME, 25 mg kg(-1)), an inhibitor of NO production, increased mean arterial blood pressure (MABP, Delta = +18 to 26 mmHg), reduced renal blood flow (RBF, Delta = -1.8 to 2.9 ml min(-1)), increased renal vascular resistance (RVR, Delta = +47 to 54 mmHg ml(-1) min(-1)), reduced glomerular filtration rate (GFR), but increased sodium excretion (UNaV). ASODN to CYP4A1 and -4A2 but not -4A3 reduced basal MABP and RVR and increased basal GFR, while ASODN to CYP4A2 significantly reduced basal UNaV suggesting a differential role for CYP4A isoforms in the regulation of renal function. ASODN to CYP4A2 but not -4A1 or -4A3 blunted the increase in MABP by L-NAME (38 +/- 9 %, P < 0.05). ASODN to CYP4A1, -4A2 and -4A3 attenuated the reduction in RBF and the consequent increase in RVR by L-NAME with a potency order of CYP4A2 = CYP4A1 > CYP4A3. ASODN to CYP4A1 and -4A2 but not -4A3 attenuated L-NAME-induced reduction in GFR, but ASODN to all three CYP4A isoforms blunted the L-NAME-induced increase in UNaV (CYP4A3 > CYP4A1 >> CYP4A2). We conclude from these data that CYP4A isoforms contribute to different extents to basal renal function. Moreover, CYP4A2 contributes greatest to haemodynamic responses while CYP4A3 contributes greatest to tubular responses following NO inhibition. We therefore propose that NO differentially regulates the function of CYP4A1, -4A2, and -4A3 isoforms in the renal vasculature and the nephron.



Gene Ontology Annotations    Click to see Annotation Detail View

Biological Process

  
Object SymbolSpeciesTermQualifierEvidenceWithNotesSourceOriginal Reference(s)
Cyp4a1Ratarachidonate metabolic process  IMP  RGD 
Cyp4a2Ratarachidonate metabolic process  IMP  RGD 
Cyp4a3Ratarachidonate metabolic process  IMP  RGD 
Cyp4a1Raticosanoid biosynthetic process  IMP  RGD 
Cyp4a2Raticosanoid biosynthetic process  IMP  RGD 
Cyp4a3Raticosanoid biosynthetic process  IMP  RGD 

Molecular Function

  

Molecular Pathway Annotations    Click to see Annotation Detail View

RGD Manual Annotations


  
Objects Annotated

Genes (Rattus norvegicus)
Cyp4a1  (cytochrome P450, family 4, subfamily a, polypeptide 1)
Cyp4a2  (cytochrome P450, family 4, subfamily a, polypeptide 2)
Cyp4a3  (cytochrome P450, family 4, subfamily a, polypeptide 3)

Genes (Homo sapiens)
CYP4A11  (cytochrome P450 family 4 subfamily A member 11)


Additional Information