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Articles by J. C Witteman
Total Records ( 3 ) for J. C Witteman
  M. F Engberink , E. G Schouten , A Hofman , J. C Witteman and J. M Geleijnse
 

Background: Little is known about the effect of different types of dairy food products on the development of hypertension.

Objective: The objective was to determine whether the incidence of hypertension in older Dutch subjects is associated with intake of dairy products.

Design: We examined the relation between dairy intake and incident hypertension in 2245 participants of the Rotterdam Study aged ≥55 y with complete dietary and blood pressure data, who were free of hypertension at baseline (1990–1993). Blood pressure was reexamined in 1993–1995 and in 1997–1999. Hazard ratios (HRs) with 95% CIs for 2- and 6-y incidence of hypertension were obtained in quartiles of energy-adjusted dairy intake, with adjustment for age, sex, BMI, smoking, educational level, dietary factors, and intake of alcohol and total energy.

Results: Risk of hypertension after 2 y of follow-up (664 incident cases) was inversely associated with dairy product intake. After adjustment for confounders, HRs (95% CIs) were 1.00, 0.82 (0.67, 1.02), 0.67 (0.54, 0.84), and 0.76 (0.61, 0.95) in consecutive quartiles of total dairy product intake (P for trend = 0.008). Corresponding HRs for low-fat dairy products were 1.00, 0.75 (0.60, 0.92), 0.77 (0.63, 0.96), and 0.69 (0.56, 0.86) (P for trend = 0.003). Analysis of specific types of dairy products showed an inverse association with milk and milk products (P for trend = 0.07) and no association with high-fat dairy or cheese (P > 0.6). After 6 y of follow-up (984 incident cases), the associations with hypertension were attenuated to risk reductions of 20% for both total and low-fat dairy products between the extreme quartiles of intake (P for trend = 0.07 and 0.09, respectively).

Conclusion: Intake of low-fat dairy products may contribute to the prevention of hypertension at an older age.

  A Dehghan , Q Yang , A Peters , S Basu , J. C Bis , A. R Rudnicka , M Kavousi , M. H Chen , J Baumert , G. D.O Lowe , B McKnight , W Tang , M de Maat , M. G Larson , S Eyhermendy , W. L McArdle , T Lumley , J. S Pankow , A Hofman , J. M Massaro , F Rivadeneira , M Kolz , K. D Taylor , C. M van Duijn , S Kathiresan , T Illig , Y. S Aulchenko , K. A Volcik , A. D Johnson , A. G Uitterlinden , G. H Tofler , C Gieger , Psaty Wellcome Trust Case Control Consortium , D. J Couper , E Boerwinkle , W Koenig , C. J O`Donnell , J. C Witteman , D. P Strachan , N. L Smith and A. R. Folsom
 

Background— Fibrinogen is both central to blood coagulation and an acute-phase reactant. We aimed to identify common variants influencing circulation fibrinogen levels.

Methods and Results— We conducted a genome-wide association analysis on 6 population-based studies, the Rotterdam Study, the Framingham Heart Study, the Cardiovascular Health Study, the Atherosclerosis Risk in Communities Study, the Monitoring of Trends and Determinants in Cardiovascular Disease/KORA Augsburg Study, and the British 1958 Birth Cohort Study, including 22 096 participants of European ancestry. Four loci were marked by 1 or more single-nucleotide polymorphisms that demonstrated genome-wide significance (P<5.0x10–8). These included a single-nucleotide polymorphism located in the fibrinogen β chain (FGB) gene and 3 single-nucleotide polymorphisms representing newly identified loci. The high-signal single-nucleotide polymorphisms were rs1800789 in exon 7 of FGB (P=1.8x10–30), rs2522056 downstream from the interferon regulatory factor 1 (IRF1) gene (P=1.3x10–15), rs511154 within intron 1 of the propionyl coenzyme A carboxylase (PCCB) gene (P=5.9x10–10), and rs1539019 on the NLR family pyrin domain containing 3 isoforms (NLRP3) gene (P=1.04x10–8).

Conclusions— Our findings highlight biological pathways that may be important in regulation of inflammation underlying cardiovascular disease.

  F Marroni , A Pfeufer , Y. S Aulchenko , C. S Franklin , A Isaacs , I Pichler , S. H Wild , B. A Oostra , A. F Wright , H Campbell , J. C Witteman , S Kaab , A. A Hicks , U Gyllensten , I Rudan , T Meitinger , C Pattaro , C. M van Duijn , J. F Wilson , P. P Pramstaller and on behalf of the EUROSPAN Consortium
 

Background— We set out to identify common genetic determinants of the length of the RR and QT intervals in 2325 individuals from isolated European populations.

Methods and Results— We analyzed the heart rate at rest, measured as the RR interval, and the length of the corrected QT interval for association with 318 237 single-nucleotide polymorphisms. The RR interval was associated with common variants within GPR133, a G-protein–coupled receptor (rs885389, P=3.9x10–8). The QT interval was associated with the earlier reported NOS1AP gene (rs2880058, P=2.00x10–10) and with a region on chromosome 13 (rs2478333, P=4.34x10–8), which is 100 kb from the closest known transcript LOC730174 and has previously not been associated with the length of the QT interval.

Conclusion— Our results suggested an association between the RR interval and GPR133 and confirmed an association between the QT interval and NOS1AP.

 
 
 
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