Clinical Research |
From the Second Department of Internal Medicine (T.N., M.S., Y.T., D.R., K.K.) and the Department of Gynecology (K.F.), Nihon University School of Medicine, Tokyo, Japan.
Correspondence to Tomohiro Nakayama, MD, Second Department of Internal Medicine, Nihon University School of Medicine, Ooyaguchi-kamimachi, 30-1, Itabashi-ku, Tokyo 173-8610, Japan. E-mail tnakayam{at}med.nihon-u.ac.jp
| Abstract |
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Key Words: natriuretic peptides type A receptors 5'-flanking region essential hypertension
| Introduction |
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Essential hypertension (EH) is thought to be a multifactorial disorder, and there are only a few reports of candidate genes associated with EH.12 Mice with a targeted deletion of NPRA showed hypertension, cardiac hypertrophy, and sudden death.13 These findings suggest that NPRA may play key roles in vasodilation, maintenance of blood pressure, and cardiac remodeling and that lack of it may lead to hypertension and other cardiovascular diseases.
We recently described the exon/intron organization of the hNPRA gene.14 The aim of the present study was to isolate the 5'-flanking region of the hNPRA gene and any genetic variants of this region and to assess whether there is an association between the hNPRA gene and EH.
| Materials and Methods |
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Rapid Amplification of 5' cDNA Ends
Experiments involving rapid amplification of 5' cDNA ends were
conducted to map the transcriptional start site as previously
described.16 cDNA was synthesized with an antisense primer
and human kidney poly(A)+ RNA.
Subjects
The study group consisted of 200 patients (mean age 52.8±9.6
years) with EH and 200 age-matched normotensive (NT) healthy subjects
(mean age 52.5±8.1 years). Both groups were selected according to the
criteria as described previously.16 Subjects were
recruited, and informed consent was obtained from each individual
according to a protocol approved by the Ethics Committee of Nihon
University.
Detection and Genotyping of a Deletion Mutation of hNPRA
To screen for mutations, 2 oligonucleotide
primers (5'-TCTTCACGAAGCGCTCACTCG-3' and
5'-CAGTACCACGGC-TACCGTCAGGTT-3') that recognize part of
the 5'-untranslated region were designed. DNA was extracted from whole
blood, and single-strand conformation polymorphism (SSCP) was then
performed as described previously.17
To determine the genotypes, PCR was performed with the same primers and conditions as in the SSCP analysis. The PCR products were separated on sequencing gels and visualized by autoradiography.
Gel Mobility Shift Assay
To examine the DNAnuclear protein complex formation, a gel
mobility shift assay was performed with wild-type and mutant-type DNA
fragments by using the Gel Shift Assay Core System kit (Promega), as
previously described.18
Measurement of Transcriptional Activities of Wild-Type and
Mutant-Type Alleles
Wild-type and mutant-type reporter constructs were made by
subcloning the 1.3 kilobase pairs of the 5'-flanking region of the
hNPRA gene into the luciferase reporter gene vectors. hNPRA promoter
plasmids and a plasmid containing thymidine kinasedriven pRL
(Toyo Ink) were cotransfected into human umbilical vein
endothelial cells (HUVECs) by using liposome suspension
(GIBCO-BRL). Luciferase activity was measured at least 3 times in
duplicate with a double luciferase assay system (Toyo Ink). All data
were normalized as relative light units per pRLthymidine kinase
activity.
Plasma Levels of ANP and BNP
Twenty-five subjects in the NT group and 25 patients in the EH
group who had the wild-type allele were selected randomly. One
subject in the NT group and 5 patients in the EH group who had the
deleted allele were also selected. Plasma ANP and BNP were measured
with each sensitive immunoradiometric assay.19 20 21
Statistical Analysis
The distributions of the genotypes between EH patients
and NT subjects were tested by a 2-sided Fisher exact test and multiple
logistic regression analysis. Comparisons between plasma levels
of ANP and BNP were analyzed by ANOVA. Correlations between
plasma ANP and BNP levels and blood pressures were determined by linear
regression analysis. ANCOVA was used for comparison of the
slopes of regression lines. A value of P<0.05 was
considered statistically significant.
An expanded Materials and Methods section is available online at http://www.circresaha.org.
| Results |
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1 kb of the 5'-flanking region was
isolated. To isolate a region further upstream, a second TAIL-PCR was
performed with 3 specific antisense primers (TAIL-prom R1 5'-CAA GTC
TCC GGC TAT CCG GA-3' TAIL-prom R2 5'-CCA AGC TCC GAA CCC TCC CT-3',
and TAIL-prom R3 5'-GGA TCT TTA ACT CCT TCC CCG-3') that allowed us to
isolate a total of 2 kb of sequence from the 5'-flanking region of the
hNPRA gene. More than 120 bp of the overlapping sequences were
identical between the PCR products obtained in the first and second
TAIL-PCRs. The 2-kb sequence of the 5'-flanking region of the hNPRA
gene lacks a typical TATA box. However, several putative transcription
factor binding sites, such as an inverted CCAAT box, stimulatory
protein-1 (Sp1), activator protein-2 (AP-2), and
Zeste binding sites, are present. The 2-kb sequence has been
submitted to GenBank (accession No. AB012188). The transcriptional
initiation site was identified by sequencing the concatenation
product and is shown in Figure 1
|
Association of the Deletion Mutation With EH
We used SSCP to search for mutations or polymorphisms in the
5'-flanking region of the hNPRA gene in patients with EH, and we
identified an insertion/deletion mutation. This deletion removes 8
nucleotides and affects the Zeste and AP-2 binding sites
(Figure 1
).
We genotyped 200 EH and 200 NT individuals and found 9 subjects
with the deletion: 8 in the EH group and 1 in the NT group
(Table
). All were heterozygous. The
overall distribution of the genotype differed significantly
between the EH patients and the NT group (2-sided Fisher exact value,
P=0.037). Logistic linear regression analysis
adjusted for age and sex demonstrated the deleted allele to be
associated significantly with EH (odds ratio 8.8, 95% CI 1.1 to 72.5).
The NT subject who carried the deleted allele had LVH but not
hypertension.
|
Gel Mobility Shift Assay
As shown in Figure 2
, 300 ng/lane of
human recombinant AP-2 formed a complex with the wild-type probe, which
decreased in a dependent manner with the addition of 50- to 100-fold
molar excesses of an unlabeled AP-2 binding site fragment. The complex
was not changed by the addition of a 100-fold molar excess of the
nonspecific fragment. However, the mutant-type probe formed no complex
with human recombinant AP-2 in the gel shift assay (Figure 2
).
|
Transcriptional Activities
To study transcriptional activity, we tranfected HUVECs with
promoter constructs of the hNPRA gene. The promoter activity of the
deletion allele was 33% that of the insertion/wild-type allele
(Figure 3
).
|
Plasma Levels of ANP and BNP
Figure 4
shows plasma ANP and BNP
the levels in NT subjects and in EH patients with and without the
deleted allele. Plasma ANP and BNP levels were significantly higher
in EH patients with the wild-type allele than in NT subjects with
the wild-type allele. The plasma BNP levels in EH patients with the
deleted allele were significantly higher than levels in NT subjects
without the deleted allele and levels in EH patients without the
deleted allele. The relationship between ANP and mean blood
pressure is shown in Figure 5
.
Scatterplots show that the slopes of the line characterizing the plasma
ANP levels in subjects with and without the deleted allele were not
significantly different. However, the slope of the line characterizing
the plasma BNP levels in subjects with the deleted allele was
steeper than that in subjects without the deleted allele
(P=0.011).
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| Discussion |
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The transcription initiation site of the hNPRA gene was identified at base/nucleotide -88 with respect to the ATG start codon; thus, plasmids that contained the 1300 bp upstream from the start codon were used for luciferase reporter gene assays. We proved that the promoter activity of the deletion allele was lower than that of the wild-type allele in HUVECs; this suggests that the promoter activity of the deletion allele is lower in other cells or tissue expressing the hNPRA gene, because transcription factors AP-2 and Zeste are widely distributed in tissues and involve in embryonic morphogenesis and cell development.25 26 Using a gel shift assay, we demonstrated that the AP-2 protein could not bind the deletion-type allele. Transcription factor AP-2 is thought to be a constitutive regulator of several genes that have fundamental roles during development.27 28 This is consistent with our findings that a plasmid containing the deletion-type allele has reduced transcriptional activity.
The NP family is involved in the regulation of blood pressure and fluid volume. Thus, it is possible that abnormalities in NP are associated with cardiovascular diseases such as EH. Several reports showed that plasma ANP and BNP levels are higher in individuals with EH than in NT individuals.29 30 Transgenic mice with prolonged overexpression of ANP or BNP have lower blood pressures than do their nontransgenic littermates.31 32 These findings suggest that abnormalities in ANP, BNP, or NPRA may be related to the pathophysiology of hypertension. In the present study, plasma ANP and BNP levels were measured, and they were higher in EH patients than in NT subjects, which is consistent with previous reports.29 30 Although plasma ANP levels are not significantly different between subjects without the deleted allele and subjects with the deleted allele, the levels of plasma BNP in EH patients with the deleted allele are significantly higher than those in EH patients without the deleted allele. Furthermore, scatterplots between BNP and mean blood pressure show that plasma BNP levels are significantly higher in subjects with the deleted allele than levels in subjects without the deleted allele, despite having comparable blood pressures. These findings suggest that the compensatory elevation of plasma BNP is caused by decreased NPRA resulting from a deletion in the hNPRA gene. Eight patients with a deleted NPRA allele were found in the EH group, and their hypertension may be caused by decreased hNPRA activity. Differences in plasma levels of ANP may not have been observed because of the limited sensitivity of the technique for measuring ANP concentrations.
Nishikimi et al20 reported that plasma ANP and BNP levels are increased in EH patients with LVH and that BNP secretion is elevated in concentric hypertrophy. In animal models, suprarenal aortic coarctation leads to progressive hypertension, resulting in pressure-overload LVH and progressive increases in plasma ANP and BNP.33 Furthermore, an elevated plasma BNP has been shown to be a better marker of LVH than ANP in patients with suspected cardiac disease independent of blood pressure.34 Some reports have suggested that infusion of ANP or BNP improves left ventricular function in patients with congestive heart failure.35 36 In cardiac hypertrophy induced by endothelin and phenylephrine, ANP and BNP expression levels are significantly high.37 Thus, hemodynamic overload and cardiac hypertrophy may be related directly to increases in plasma BNP and ANP levels. These findings suggest that the NP system plays a protective role in the prevention of LVH. We found 1 subject with the deleted allele who has LVH despite having normal blood pressure. His LVH may be caused by decreased hNPRA activity. The 4 EH patients with the deleted allele had no LVH. This may be due to the short periods of time that these patients have had hypertension; all have been diagnosed within the last 5 years.
Mice with targeted deletion of NPRA have experienced hypertension, cardiac hypertrophy, and sudden death,13 suggesting that NPRA may play a key role in vasodilation, maintenance of blood pressure, and cardiac remodeling. Abnormal NPRA levels or function may lead to hypertension and other cardiovascular diseases. Thus, it is likely that hypertension or LVH in individuals with the deleted allele is caused by reduced hNPRA activity.
The structure of the 5'-flanking region of the hNPRA gene may provide insight into the transcriptional regulation of this gene. This is the first report that associates a mutation in the 5'-flanking region of the hNPRA gene with transcriptional activity. This insertion/deletion mutation of the hNPRA gene may confer increased susceptibility to EH or LVH in Japanese individuals.
| Acknowledgments |
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Received January 27, 2000; accepted February 25, 2000.
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H.-S. Kim, G. Lee, S. W. M. John, N. Maeda, and O. Smithies Molecular phenotyping for analyzing subtle genetic effects in mice: Application to an angiotensinogen gene titration PNAS, April 2, 2002; 99(7): 4602 - 4607. [Abstract] [Full Text] [PDF] |
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