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Racial differences in paraoxonase-1 (PON1): a factor in the health of southerners?

Davis KA, Crow JA, Chambers HW, Meek EC, Chambers JE - Environ. Health Perspect. (2009)

Bottom Line: Cotinine levels indicated that all samples came from non-smokers and that CRP levels were higher in African Americans than in Caucasians and higher in females than in males.CRP levels showed no association with paraoxonase activities.These data present initial observations for use in characterizing the poorer cardiovascular health status of the population in the southern United States and more specifically southern African Americans.

View Article: PubMed Central - PubMed

Affiliation: Center for Environmental Health Sciences, College of Veterinary Medicine, Mississippi State University, Mississippi State, Mississippi 39762-6100, USA.

ABSTRACT

Background: The southern United States (excluding Florida) has the highest age-adjusted rate of cardiovascular disease (CVD) in the country, with African Americans having a higher prevalence of CVD than Caucasians. Paraoxonase-1 (PON1), an enzyme associated with high-density lipoprotein particles, participates both in the hydrolysis of oxidized lipids (thus protecting against atherosclerosis) and in the hydrolysis of organophosphates. Higher paraoxonase activity has been associated with lower risk of atherosclerosis.

Objectives: In this study we characterized the distribution of the functional PON1(Q192R) polymorphisms (PON status as assessed by diazoxonase to paraoxonase ratios) and the PON1 activity levels in 200 adult males and females of both races (50 in each race/sex class) from the southern United States from commercially obtained blood bank serum samples.

Methods: We used spectrophotometric methods with serum to determine PON1 status, arylesterase activities (phenyl acetate hydrolysis), and levels of cotinine and C-reactive protein (CRP).

Results: African Americans had higher paraoxonase activities but lower diazoxonase activities than did Caucasians, consistent with African Americans having a lower proportion of the functional genotype QQ (QQ 15%, QR 34%, RR 44%, 7% indeterminate), than did Caucasians (QQ 60%, QR 31%, RR 7%, 2% indeterminate). Cotinine levels indicated that all samples came from non-smokers and that CRP levels were higher in African Americans than in Caucasians and higher in females than in males. CRP levels showed no association with paraoxonase activities.

Conclusions: These data present initial observations for use in characterizing the poorer cardiovascular health status of the population in the southern United States and more specifically southern African Americans.

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Related in: MedlinePlus

Arylesterase activity as monitored with phenyl acetate versus POase activities in sera of male and female African-American and Caucasian southerners. Abbreviations: AAF, African-American female; AAM, African-American male; CF, Caucasian female; CM, Caucasian male.
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f4-ehp-117-1226: Arylesterase activity as monitored with phenyl acetate versus POase activities in sera of male and female African-American and Caucasian southerners. Abbreviations: AAF, African-American female; AAM, African-American male; CF, Caucasian female; CM, Caucasian male.

Mentions: Results plotting phenyl acetate hydrolysis (arylesterase activity) versus POase activity showed a trend toward separating individuals into the three functional genotypes (Figure 4), but did not yield as clear-cut a distinction among the three functional genotypes as did the plot of POase versus DZOase. Caucasians had slightly higher activities (16,407 ± 341 U/L) than African Americans (14,276 ± 327 U/L), but this was not statistically significant.


Racial differences in paraoxonase-1 (PON1): a factor in the health of southerners?

Davis KA, Crow JA, Chambers HW, Meek EC, Chambers JE - Environ. Health Perspect. (2009)

Arylesterase activity as monitored with phenyl acetate versus POase activities in sera of male and female African-American and Caucasian southerners. Abbreviations: AAF, African-American female; AAM, African-American male; CF, Caucasian female; CM, Caucasian male.
© Copyright Policy - public-domain
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC2721865&req=5

f4-ehp-117-1226: Arylesterase activity as monitored with phenyl acetate versus POase activities in sera of male and female African-American and Caucasian southerners. Abbreviations: AAF, African-American female; AAM, African-American male; CF, Caucasian female; CM, Caucasian male.
Mentions: Results plotting phenyl acetate hydrolysis (arylesterase activity) versus POase activity showed a trend toward separating individuals into the three functional genotypes (Figure 4), but did not yield as clear-cut a distinction among the three functional genotypes as did the plot of POase versus DZOase. Caucasians had slightly higher activities (16,407 ± 341 U/L) than African Americans (14,276 ± 327 U/L), but this was not statistically significant.

Bottom Line: Cotinine levels indicated that all samples came from non-smokers and that CRP levels were higher in African Americans than in Caucasians and higher in females than in males.CRP levels showed no association with paraoxonase activities.These data present initial observations for use in characterizing the poorer cardiovascular health status of the population in the southern United States and more specifically southern African Americans.

View Article: PubMed Central - PubMed

Affiliation: Center for Environmental Health Sciences, College of Veterinary Medicine, Mississippi State University, Mississippi State, Mississippi 39762-6100, USA.

ABSTRACT

Background: The southern United States (excluding Florida) has the highest age-adjusted rate of cardiovascular disease (CVD) in the country, with African Americans having a higher prevalence of CVD than Caucasians. Paraoxonase-1 (PON1), an enzyme associated with high-density lipoprotein particles, participates both in the hydrolysis of oxidized lipids (thus protecting against atherosclerosis) and in the hydrolysis of organophosphates. Higher paraoxonase activity has been associated with lower risk of atherosclerosis.

Objectives: In this study we characterized the distribution of the functional PON1(Q192R) polymorphisms (PON status as assessed by diazoxonase to paraoxonase ratios) and the PON1 activity levels in 200 adult males and females of both races (50 in each race/sex class) from the southern United States from commercially obtained blood bank serum samples.

Methods: We used spectrophotometric methods with serum to determine PON1 status, arylesterase activities (phenyl acetate hydrolysis), and levels of cotinine and C-reactive protein (CRP).

Results: African Americans had higher paraoxonase activities but lower diazoxonase activities than did Caucasians, consistent with African Americans having a lower proportion of the functional genotype QQ (QQ 15%, QR 34%, RR 44%, 7% indeterminate), than did Caucasians (QQ 60%, QR 31%, RR 7%, 2% indeterminate). Cotinine levels indicated that all samples came from non-smokers and that CRP levels were higher in African Americans than in Caucasians and higher in females than in males. CRP levels showed no association with paraoxonase activities.

Conclusions: These data present initial observations for use in characterizing the poorer cardiovascular health status of the population in the southern United States and more specifically southern African Americans.

Show MeSH
Related in: MedlinePlus