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The -786T>C promoter polymorphism of the NOS3 gene is associated with prostate cancer progression.

Marangoni K, Araújo TG, Neves AF, Goulart LR - BMC Cancer (2008)

Bottom Line: NOS3 gene expression levels were affected by the -786T>C polymorphism, and there was a 2-fold increase in NOS3 levels favored by the incorporation of each C allele.NOS3 levels higher than 80% of the constitutive gene expression level (B2M) presented a 4-fold increase in PCa occurrence.The -786T>C polymorphism was the most important promoter alteration of the NOS3 gene that may affect the PCa progression, but not its occurrence, and the incorporation of the C allele is associated with increased levels of NOS3 transcripts.

View Article: PubMed Central - HTML - PubMed

Affiliation: Federal University of Uberlândia, Institute of Genetics and Biochemistry, Molecular Genetics Laboratory, Campus Umuarama, Block 2E, Room 24, 38400-902, Uberlândia, MG, Brazil. kmarangoni@yahoo.com.br

ABSTRACT

Background: There is no biological or epidemiological data on the association between NOS3 promoter polymorphisms and prostate cancer. The polymorphisms in the promoter region of NOS3 gene may be responsible for variations in the plasma NO, which may promote cancer progression by providing a selective growth advantage to tumor cells by angiogenic stimulus and by direct DNA damage.

Methods: This study aimed evaluating the NOS3 promoter polymorphisms by PCR-SSCP and sequencing, associating genotypes and haplotypes with NOS3 expression levels through semi-quantitative RT-PCR, and with PCA3 mRNA detection, a specific tumor biomarker, in the peripheral blood of pre-surgical samples from 177 patients; 83 PCa and 94 BPH.

Results: Three novel SNPs were identified -764A>G, -714G>T and -649G>A in the NOS3 gene promoter region, which together with the -786T>C generated four haplotypes (N, T, C, A). NOS3 gene expression levels were affected by the -786T>C polymorphism, and there was a 2-fold increase in NOS3 levels favored by the incorporation of each C allele. NOS3 levels higher than 80% of the constitutive gene expression level (B2M) presented a 4-fold increase in PCa occurrence.

Conclusion: The -786T>C polymorphism was the most important promoter alteration of the NOS3 gene that may affect the PCa progression, but not its occurrence, and the incorporation of the C allele is associated with increased levels of NOS3 transcripts. The NOS3 transcript levels presented a bimodal behavior in tumor development and may be used as a biomarker together with the PCA3 marker for molecular staging of the prostate cancer.

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PCR-SSCP analysis. 15% polyacrylamide gel electrophoresis (49:1 acrylamide:bisacrylamide) with silver staining, evidencing the seven genotypic conformations and their chromosome models with four possible haplotypes, constructed based on the five NOS3 promoter polymorphisms investigated.
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Figure 2: PCR-SSCP analysis. 15% polyacrylamide gel electrophoresis (49:1 acrylamide:bisacrylamide) with silver staining, evidencing the seven genotypic conformations and their chromosome models with four possible haplotypes, constructed based on the five NOS3 promoter polymorphisms investigated.

Mentions: During genotyping of the -786T>C polymorphism of the NOS3 gene promoter region, three novel SNPs have been discovered [-764A>G, GenBank: RefSeq NM_EF042808/-714G>T, GenBank: RefSeq NM_EF042809/-649G>A, GenBank: RefSeq NM_EF042810]. Additionally, the two SNPs previously described [-786T>C, GenBank: RefSeq NM_2070744/-690C>T, GenBank: RefSeq NM_3918225] were also characterized. Seven SSCP conformations were observed in the polyacrylamide gel electrophoresis (Figure 2), although only three conformations were expected.


The -786T>C promoter polymorphism of the NOS3 gene is associated with prostate cancer progression.

Marangoni K, Araújo TG, Neves AF, Goulart LR - BMC Cancer (2008)

PCR-SSCP analysis. 15% polyacrylamide gel electrophoresis (49:1 acrylamide:bisacrylamide) with silver staining, evidencing the seven genotypic conformations and their chromosome models with four possible haplotypes, constructed based on the five NOS3 promoter polymorphisms investigated.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC2571109&req=5

Figure 2: PCR-SSCP analysis. 15% polyacrylamide gel electrophoresis (49:1 acrylamide:bisacrylamide) with silver staining, evidencing the seven genotypic conformations and their chromosome models with four possible haplotypes, constructed based on the five NOS3 promoter polymorphisms investigated.
Mentions: During genotyping of the -786T>C polymorphism of the NOS3 gene promoter region, three novel SNPs have been discovered [-764A>G, GenBank: RefSeq NM_EF042808/-714G>T, GenBank: RefSeq NM_EF042809/-649G>A, GenBank: RefSeq NM_EF042810]. Additionally, the two SNPs previously described [-786T>C, GenBank: RefSeq NM_2070744/-690C>T, GenBank: RefSeq NM_3918225] were also characterized. Seven SSCP conformations were observed in the polyacrylamide gel electrophoresis (Figure 2), although only three conformations were expected.

Bottom Line: NOS3 gene expression levels were affected by the -786T>C polymorphism, and there was a 2-fold increase in NOS3 levels favored by the incorporation of each C allele.NOS3 levels higher than 80% of the constitutive gene expression level (B2M) presented a 4-fold increase in PCa occurrence.The -786T>C polymorphism was the most important promoter alteration of the NOS3 gene that may affect the PCa progression, but not its occurrence, and the incorporation of the C allele is associated with increased levels of NOS3 transcripts.

View Article: PubMed Central - HTML - PubMed

Affiliation: Federal University of Uberlândia, Institute of Genetics and Biochemistry, Molecular Genetics Laboratory, Campus Umuarama, Block 2E, Room 24, 38400-902, Uberlândia, MG, Brazil. kmarangoni@yahoo.com.br

ABSTRACT

Background: There is no biological or epidemiological data on the association between NOS3 promoter polymorphisms and prostate cancer. The polymorphisms in the promoter region of NOS3 gene may be responsible for variations in the plasma NO, which may promote cancer progression by providing a selective growth advantage to tumor cells by angiogenic stimulus and by direct DNA damage.

Methods: This study aimed evaluating the NOS3 promoter polymorphisms by PCR-SSCP and sequencing, associating genotypes and haplotypes with NOS3 expression levels through semi-quantitative RT-PCR, and with PCA3 mRNA detection, a specific tumor biomarker, in the peripheral blood of pre-surgical samples from 177 patients; 83 PCa and 94 BPH.

Results: Three novel SNPs were identified -764A>G, -714G>T and -649G>A in the NOS3 gene promoter region, which together with the -786T>C generated four haplotypes (N, T, C, A). NOS3 gene expression levels were affected by the -786T>C polymorphism, and there was a 2-fold increase in NOS3 levels favored by the incorporation of each C allele. NOS3 levels higher than 80% of the constitutive gene expression level (B2M) presented a 4-fold increase in PCa occurrence.

Conclusion: The -786T>C polymorphism was the most important promoter alteration of the NOS3 gene that may affect the PCa progression, but not its occurrence, and the incorporation of the C allele is associated with increased levels of NOS3 transcripts. The NOS3 transcript levels presented a bimodal behavior in tumor development and may be used as a biomarker together with the PCA3 marker for molecular staging of the prostate cancer.

Show MeSH
Related in: MedlinePlus