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Mol D, Mulder MJ, Veenstra R, Allaart CP, Hof IE, Kemme MJB, Khan M, Kimman GP, Mairuhu G, De Ruiter GS, Tahapary GJM, De Groot JR, De Jong JSSG. Strategies for repeat ablation for atrial fibrillation: a multicentre comparison of non-pulmonary vein versus pulmonary vein target ablation. Europace 2022. [DOI: 10.1093/europace/euac053.190] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Abstract
Abstract
Funding Acknowledgements
Type of funding sources: None.
Introduction
Approximately 18% of patients with atrial fibrillation (AF) undergo a repeat ablation within 12 months after their index ablation. Despite the high prevalence, comparative studies on non-pulmonary vein (PV) target strategies in repeat AF ablation are scarce.
Purpose: This study aims to describe 12 months efficacy of non-PV and PV target ablations as a repeat ablation strategy.
Methods
A multicentre retrospective, descriptive study was conducted with data of 280 patients who underwent repeat AF ablation. Ablation strategy for repeat ablation was at the operators’ discretion. Non-PV target ablation (n=140) included posterior wall isolation, mitral line, roofline and/or complex fractionated atrial electrogram ablation. PV target ablation (n=140), included re-isolation and/or wide atrium circumferential ablation. Patients’ demographics and rhythm outcomes during 12-months follow-up were analysed.
Results: Overall, the mean age was 63 ± 9 years, 64% were male, and body mass index was 27.1 ± 4.2. Patients undergoing non-PV target ablation had more frequently persistent AF (47.9% vs 14.3%, p < 0.001), and had a higher CHA2DS2 VASc (2.0 vs 1.3, p < 0.001). At 12 months, more atrial tachyarrhythmias were observed in the non-PV target group (48.6%) compared to the PV target group (29.3%, p=0.001). Similarly, a significantly higher AF and atrial tachycardia (AT) recurrence rate was observed after non-PV target ablation compared to PV target ablation (36.4% versus 22.1% and 22.9% versus 10.7%). After adjusting for several associated covariates, a significantly higher AT recurrence risk remained in the non-PV target group (adjusted OR 2.19 95% CI 1.18 – 4.42, p = 0.023) (Figure 1C). Sensitivity analysis was performed with inverse propensity weighting to assess the robustness of the multivariate model and demonstrated comparable outcomes. Both groups significantly de-escalated anti-arrhythmic drug use, de-escalation was more profound after PV target ablation. Patients with isolated PVs during non-PV target ablation had a significantly higher risk for AF recurrence than those with reconnected PVs (Figure 1B).
Conclusion: Compared to PV target ablation, non-PV target repeat ablation did not improve outcomes after 12 months and was independently associated with a higher risk for AT recurrences.
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Kiekens WJ, Baams L, Veenstra R. Differences by sex and gender in the association between minority stress and alcohol use among sexual and gender minority youth: A daily diary study. Soc Sci Med 2022; 294:114679. [PMID: 35030397 PMCID: PMC7612808 DOI: 10.1016/j.socscimed.2021.114679] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/14/2020] [Revised: 06/23/2021] [Accepted: 12/21/2021] [Indexed: 12/12/2022]
Abstract
RATIONALE Sexual and gender minority (SGM) youth consume more alcohol than their heterosexual, cisgender peers. The experience of minority stress is theorized to explain these disparities. Research often neglects the day-to-day variability in minority stress that SGM youth encounter and whether alcohol use is associated with daily experiences of minority stress. Further, there is heterogeneity in alcohol use among SGM youth. Sex assigned at birth and gender identity could potentially explain this heterogeneity. OBJECTIVE Therefore, this study aimed to examine whether daily experiences of minority stress were associated with daily alcohol use among SGM youth and how these associations differed by sex assigned at birth and gender identity. METHODS A 14-day daily diary study was conducted among 393 Dutch SGM youth (M age = 18.36 SD = 2.65). RESULTS Results showed few significant associations between both mean levels of minority stress and daily experiences with minority stress with alcohol use. However, higher mean levels of prejudice events were associated with higher odds of daily alcohol use (OR = 7.01, 95% CI: 1.20-40.89). Daily experiences with identity concealment were associated with lower odds of daily alcohol use for males (OR = 0.72, 95% CI: 0.60-0.86), but not for females (OR = 1.11, 95% CI: 0.93-1.32). Further, for cisgender youth, daily experiences with prejudice events were associated with higher odds of alcohol use (OR = 1.99, 95% CI: 1.05-3.78), but this was not the case for gender minority youth (OR = 0.42, 95% CI: 0.15-1.18). CONCLUSIONS The findings showed few significant associations between minority stressors and alcohol use, but daily experiences of concealment and prejudice events were associated with daily alcohol use and these associations varied by sex assigned at birth and gender identity, respectively.
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Kuiper D, Hendriks M, Veenstra R, Seggers J, Haadsma M, Heineman M, Hoek A, Hadders‐Algra M. In vitro fertilisation was associated with refractive errors when children reached the age of 11. Acta Paediatr 2019; 108:1921-1922. [PMID: 31197885 PMCID: PMC6790704 DOI: 10.1111/apa.14899] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Richards JS, Hartman CA, Jeronimus BF, Ormel J, Reijneveld SA, Veenstra R, Verhulst FC, Vollebergh WAM, Oldehinkel AJ. Beyond not bad or just okay: social predictors of young adults' wellbeing and functioning (a TRAILS study). Psychol Med 2019; 49:1459-1469. [PMID: 30229710 PMCID: PMC6541871 DOI: 10.1017/s0033291718001976] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/25/2017] [Revised: 05/23/2018] [Accepted: 07/12/2018] [Indexed: 11/07/2022]
Abstract
BACKGROUND Various childhood social experiences have been reported to predict adult outcomes. However, it is unclear how different social contexts may influence each other's effects in the long run. This study examined the joint contribution of adolescent family and peer experiences to young adult wellbeing and functioning. METHODS Participants came from the TRacking Adolescents' Individual Lives Survey (TRAILS) study (n = 2230). We measured family and peer relations at ages 11 and 16 (i.e. family functioning, perceived parenting, peer status, peer relationship quality), and functioning as the combination of subjective wellbeing, physical and mental health, and socio-academic functioning at age 22. Using structural equation modelling, overall functioning was indicated by two latent variables for positive and negative functioning. Positive, negative and overall functioning at young adulthood were regressed on adolescent family experiences, peer experiences and interactions between the two. RESULTS Family experiences during early and mid-adolescence were most predictive for later functioning; peer experiences did not independently predict functioning. Interactions between family and peer experiences showed that both protective and risk factors can have context-dependent effects, being exacerbated or overshadowed by negative experiences or buffered by positive experiences in other contexts. Overall the effect sizes were modest at best. CONCLUSIONS Adolescent family relations as well as the interplay with peer experiences predict young adult functioning. This emphasizes the importance of considering the relative effects of one context in relation to the other.
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Ormel J, Oerlemans AM, Raven D, Laceulle OM, Hartman CA, Veenstra R, Verhulst FC, Vollebergh W, Rosmalen JGM, Reijneveld SA, Oldehinkel AJ. Functional outcomes of child and adolescent mental disorders. Current disorder most important but psychiatric history matters as well. Psychol Med 2017; 47:1271-1282. [PMID: 28065168 DOI: 10.1017/s0033291716003445] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
BACKGROUND Various sources indicate that mental disorders are the leading contributor to the burden of disease among youth. An important determinant of functioning is current mental health status. This study investigated whether psychiatric history has additional predictive power when predicting individual differences in functional outcomes. METHOD We used data from the Dutch TRAILS study in which 1778 youths were followed from pre-adolescence into young adulthood (retention 80%). Of those, 1584 youths were successfully interviewed, at age 19, using the World Health Organization Composite International Diagnostic Interview (CIDI 3.0) to assess current and past CIDI-DSM-IV mental disorders. Four outcome domains were assessed at the same time: economic (e.g. academic achievement, social benefits, financial difficulties), social (early motherhood, interpersonal conflicts, antisocial behavior), psychological (e.g. suicidality, subjective well-being, loneliness), and health behavior (e.g. smoking, problematic alcohol, cannabis use). RESULTS Out of the 19 outcomes, 14 were predicted by both current and past disorders, three only by past disorders (receiving social benefits, psychiatric hospitalization, adolescent motherhood), and two only by current disorder (absenteeism, obesity). Which type of disorders was most important depended on the outcome. Adjusted for current disorder, past internalizing disorders predicted in particular psychological outcomes while externalizing disorders predicted in particular health behavior outcomes. Economic and social outcomes were predicted by a history of co-morbidity of internalizing and externalizing disorder. The risk of problematic cannabis use and alcohol consumption dropped with a history of internalizing disorder. CONCLUSION To understand current functioning, it is necessary to examine both current and past psychiatric status.
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van Maaren MC, Bretveld RW, Jobsen JJ, Veenstra R, Groothuis-Oudshoorn KCGM, Struikmans H, Maduro JH, Strobbe LJA, Poortmans P, Siesling S. Abstract P1-10-21: Influence of timing of radiation therapy following breast-conserving surgery on 10-year disease-free survival. Cancer Res 2017. [DOI: 10.1158/1538-7445.sabcs16-p1-10-21] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Abstract
Background
In the Netherlands, one of the indicators of quality of care is that radiation therapy (RT) should start within six weeks following breast-conserving surgery (BCS). However, there is still much controversy regarding timing of RT in literature. This study investigated the effect of timing of RT on disease-free survival (DFS) in a Dutch nationwide population-based cohort.
Methods
All women diagnosed with primary invasive stage I-IIIA breast cancer in 2003, treated with BCS plus RT, of whom the start date of RT was known, were included. Patients who received chemotherapy between surgery and RT were excluded, as this affects delay. Patients were categorised into three groups: <42 days, 42-55 days and >55 days, between surgery and start of RT. The primary outcome was 10-year DFS. Secondary outcomes were 10-year locoregional recurrence-free (LRRFS) and distant metastasis-free survival (DMFS). Multivariable Cox regression was used to correct for confounding. Since adjuvant systemic therapy largely influences DFS, all analyses were stratified for use of adjuvant systemic therapy (chemotherapy and/or endocrine therapy).
Results
In total, 2,759 patients were included. The median number of days between BCS and RT was 45 (IQR 37-54 days). The hazard ratio (HR) for 10-year DFS was 0.79 (95% CI: 0.65-0.96) for 42-55 days and 0.71 (95% CI: 0.56-0.90) for >55 days, both compared to <42 days. While no significant differences in 10-year LRRFS were found, 10-year DMFS (HR 0.64 [95% CI: 0.45-0.91]) was significantly higher for BCS-RT interval >55 days compared to <42 days. After stratification, no significant differences were found for any outcome in patients not treated with adjuvant systemic therapy, while in patients who were treated with adjuvant systemic therapy, 10-year DFS was significantly improved for 42-55 days (HR 0.70 (95% CI: 0.51-0.97) and >55 days (HR 0.63 (95% CI: 0.42-0.96) compared to <42 days. Significantly improved 10-year DMFS was confirmed after stratification for longer delays (HR 0.69 (95% CI: 0.47-1.00 for 42-55 days) and 0.59 (95% CI: 0.36-0.96) for >55 days, compared to <42 days)
10-year DFS, LRRFS and DMFS for different time intervals between BCS and RT, stratified for use of adjuvant systemic therapy Entire cohort (n=2,759)No adjuvant treatment (n=1,761)Adjuvant treatment (n=998)Time intervalHR [95% CI]*HR [95% CI]*HR [95% CI]*10-year DFS<42 days11142-55 days0.79 [0.65-0.96]0.83 [0.65-1.05]0.70 [0.51-0.97]>55 days0.71 [0.56-0.90]0.77 [0.57-1.03]0.63 [0.42-0.96]10-year LRRFS<42 days11142-55 days0.74 [0.51-1.06]0.79 [0.52-1.21]0.55 [0.28-1.11]>55 days0.90 [0.59-1.37]0.99 [0.61-1.60]0.67 [0.29-1.57]10-year DMFS<42 days11142-55 days0.90 [0.69-1.17]1.13 [0.77-1.66]0.69 [0.47-1.00]>55 days0.64 [0.45-0.91]0.73 [0.44-1.22]0.59 [0.36-0.96]* Corrected for all relevant confounders. HRs in bold are statistically significant (p<0.05).
Conclusion and interpretation
In conclusion, patients treated with adjuvant systemic therapy following RT showed increasing 10-year DFS and DMFS with longer BCS-RT intervals, which was not the case for patients not receiving adjuvant systemic therapy. Possible explanations for these results have to be explored further.
Citation Format: van Maaren MC, Bretveld RW, Jobsen JJ, Veenstra R, Groothuis-Oudshoorn KCGM, Struikmans H, Maduro JH, Strobbe LJA, Poortmans P, Siesling S. Influence of timing of radiation therapy following breast-conserving surgery on 10-year disease-free survival [abstract]. In: Proceedings of the 2016 San Antonio Breast Cancer Symposium; 2016 Dec 6-10; San Antonio, TX. Philadelphia (PA): AACR; Cancer Res 2017;77(4 Suppl):Abstract nr P1-10-21.
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Luesink M, Veenstra R, Loopstra A, Gorter R, Pasma K. EP-1568: Increased patient comfort for generating moulds using a 3D printer. Radiother Oncol 2015. [DOI: 10.1016/s0167-8140(15)41560-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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Ormel J, Raven D, van Oort F, Hartman CA, Reijneveld SA, Veenstra R, Vollebergh WAM, Buitelaar J, Verhulst FC, Oldehinkel AJ. Mental health in Dutch adolescents: a TRAILS report on prevalence, severity, age of onset, continuity and co-morbidity of DSM disorders. Psychol Med 2015; 45:345-360. [PMID: 25066533 DOI: 10.1017/s0033291714001469] [Citation(s) in RCA: 164] [Impact Index Per Article: 16.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
BACKGROUND With psychopathology rising during adolescence and evidence suggesting that adult mental health burden is often due to disorders beginning in youth, it is important to investigate the epidemiology of adolescent mental disorders. METHOD We analysed data gathered at ages 11 (baseline) and 19 years from the population-based Dutch TRacking Adolescents' Individual Lives Survey (TRAILS) study. At baseline we administered the Achenbach measures (Child Behavior Checklist, Youth Self-Report) and at age 19 years the World Health Organization's Composite International Diagnostic Interview version 3.0 (CIDI 3.0) to 1584 youths. RESULTS Lifetime, 12-month and 30-day prevalences of any CIDI-DSM-IV disorder were 45, 31 and 15%, respectively. Half were severe. Anxiety disorders were the most common but the least severe whereas mood and behaviour disorders were less prevalent but more severe. Disorders persisted, mostly by recurrence in mood disorders and chronicity in anxiety disorders. Median onset age varied substantially across disorders. Having one disorder increased subjects' risk of developing another disorder. We found substantial homotypic and heterotypic continuity. Baseline problems predicted the development of diagnosable disorders in adolescence. Non-intact families and low maternal education predicted externalizing disorders. Most morbidity concentrated in 5-10% of the sample, experiencing 34-55% of all severe lifetime disorders. CONCLUSIONS At late adolescence, 22% of youths have experienced a severe episode and 23% only mild episodes. This psychopathology is rather persistent, mostly due to recurrence, showing both monotypic and heterotypic continuity, with family context affecting particularly externalizing disorders. High problem levels at age 11 years are modest precursors of incident adolescent disorders. The burden of mental illness concentrates in 5-10% of the adolescent population.
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Diepstra A, Xin H, Kushekhar K, Nolte I, Visser L, Bouwman I, Kouprie N, Veenstra R, van Imhoff G, Poppema S, Hepkema B, van den Berg A. HLA Associations in EBV Status Defined Subgroups of Classical Hodgkin Lymphoma. KLINISCHE PADIATRIE 2014. [DOI: 10.1055/s-0034-1371103] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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Zou J, Salarian M, Chen Y, Veenstra R, Louis CF, Yang JJ. Gap junction regulation by calmodulin. FEBS Lett 2014; 588:1430-8. [PMID: 24440348 DOI: 10.1016/j.febslet.2014.01.003] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/05/2013] [Revised: 01/09/2014] [Accepted: 01/10/2014] [Indexed: 10/25/2022]
Abstract
Intracellular Ca(2+) activated calmodulin (CaM) inhibits gap junction channels in the low nanomolar to high micromolar range of [Ca(2+)]i. This regulation plays an essential role in numerous cellular processes that include hearing, lens transparency, and synchronized contractions of the heart. Previous studies have indicated that gap junction mediated cell-to-cell communication was inhibited by CaM antagonists. More recent evidence indicates a direct role of CaM in regulating several members of the connexin family. Since the intracellular loop and carboxyl termini of connexins are largely "invisible" in electron microscopy and X-ray crystallographic structures due to disorder in these domains, peptide models encompassing the putative CaM binding sites of several intracellular domains of connexins have been used to identify the Ca(2+)-dependent CaM binding sites of these proteins. This approach has been used to determine the CaM binding affinities of peptides derived from a number of different connexin-subfamilies.
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Chen Y, Zhou Y, Wong HC, Lin X, Xu Q, Wang X, Jiang J, Louis CF, Veenstra R, Yang JJ. Regulation of Intercellular Regulation of Signaling via Gap Junction. Biophys J 2011. [DOI: 10.1016/j.bpj.2010.12.1644] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022] Open
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Pasma K, Postma S, Luesink M, Veenstra R. OPTIMAL ISOCENTER POSITIONING USING A FULLY AUTOMATED PROCEDURE FOR LASER CENTER TO ISOCENTER SHIFTS. Radiother Oncol 2009. [DOI: 10.1016/s0167-8140(12)73045-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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Sondeijker FEPL, Ferdinand RF, Oldehinkel AJ, Veenstra R, Tiemeier H, Ormel J, Verhulst FC. Disruptive behaviors and HPA-axis activity in young adolescent boys and girls from the general population. J Psychiatr Res 2007; 41:570-8. [PMID: 16730747 DOI: 10.1016/j.jpsychires.2006.04.002] [Citation(s) in RCA: 65] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/21/2005] [Revised: 03/09/2006] [Accepted: 04/04/2006] [Indexed: 11/18/2022]
Abstract
It is important to investigate associations between biological factors and disruptive behaviors in children and adolescents. Antisocial, aggressive, and criminal behaviors in adults often begin early in life. Disruptive behaviors are often thought to be associated with low activity of the hypothalamic-pituitary-adrenal (HPA) axis. Cortisol, the end-product of this axis, can be measured to investigate HPA-axis activity. Previous studies on this topic concerned clinical or high risk samples. The aim of the present study was to investigate to which extent HPA-axis functioning plays a role in disruptive behaviors in pre-adolescents from the general population. One thousand seven hundred and sixty eight 10- to 12-year-olds from the Dutch general population were investigated. Disruptive behaviors were assessed with the Child Behavior Checklist, the Youth Self-Report, and the Antisocial Behavior Questionnaire. Baseline morning and evening salivary cortisol levels were assessed. Unexpectedly, small associations were found between disruptive behaviors, including attention problems, and higher cortisol levels. However, all effect sizes of significant effects were very small. Our study indicated that HPA-axis functioning may be more relevant in clinical or high risk samples than at the general population level. The association between HPA-axis functioning and attention problems, that has gotten less attention than that with aggressive or delinquent behaviors, requires further research. Furthermore, because effect sizes were relatively small, it can be concluded that, in pre-adolescence, the measures of baseline HPA-axis functioning that were used for the present study can not be used as biological markers for disruptive behaviors.
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Ormel J, Oldehinkel AJ, Ferdinand RF, Hartman CA, De Winter AF, Veenstra R, Vollebergh W, Minderaa RB, Buitelaar JK, Verhulst FC. Internalizing and externalizing problems in adolescence: general and dimension-specific effects of familial loadings and preadolescent temperament traits. Psychol Med 2005; 35:1825-1835. [PMID: 16300695 DOI: 10.1017/s0033291705005829] [Citation(s) in RCA: 107] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
BACKGROUND We investigated the links between familial loading, preadolescent temperament, and internalizing and externalizing problems in adolescence, hereby distinguishing effects on maladjustment in general versus dimension-specific effects on either internalizing or externalizing problems. METHOD In a population-based sample of 2230 preadolescents (10-11 years) familial loading (parental lifetime psychopathology) and offspring temperament were assessed at baseline by parent report, and offspring psychopathology at 2.5-years follow-up by self-report, teacher report and parent report. We used purified measures of temperament and psychopathology and partialled out shared variance between internalizing and externalizing problems. RESULTS Familial loading of internalizing psychopathology predicted offspring internalizing but not externalizing problems, whereas familial loading of externalizing psychopathology predicted offspring externalizing but not internalizing problems. Both familial loadings were associated with Frustration, low Effortful Control, and Fear. Frustration acted as a general risk factor predicting severity of maladjustment; low Effortful Control and Fear acted as dimension-specific risk factors that predicted a particular type of psychopathology; whereas Shyness, High-Intensity Pleasure, and Affiliation acted as direction markers that steered the conditional probability of internalizing versus externalizing problems, in the event of maladjustment. Temperament traits mediated one-third of the association between familial loading and psychopathology. Findings were robust across different composite measures of psychopathology, and applied to girls as well as boys. CONCLUSIONS With regard to familial loading and temperament, it is important to distinguish general risk factors (Frustration) from dimension-specific risk factors (familial loadings, Effortful Control, Fear), and direction markers that act as pathoplastic factors (Shyness, High-Intensity Pleasure, Affiliation) from both types of risk factors. About one-third of familial loading effects on psychopathology in early adolescence are mediated by temperament.
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van Leeuwen EB, Wisman GB, Tervaert JW, Palmans LL, van Wijk RT, Veenstra R, Molema G, van der Zee AG, van der Meer J, Ruiters MH. An SV40 large T-antigen immortalized human umbilical vein endothelial cell line for anti-endothelial cell antibody detection. Clin Exp Rheumatol 2001; 19:283-90. [PMID: 11407081] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/20/2023]
Abstract
OBJECTIVE Anti-endothelial cell antibodies in serum of patients with different inflammatory diseases can be detected by a whole cell enzyme-linked immunosorbant assay, using primary cultures of human umbilical vein endothelial cells. To avoid repeated isolation, it would be of great value if an immortal endothelial cell line could be used to perform anti-endothelial cell antibody assays. METHODS In this study endothelial cells from human umbilical and iliac veins and arteries were transfected with a plasmid containing the Simian Virus 40 large T-antigen. Endothelial cell line(s) derived from this procedure were compared with human umbilical vein endothelial cells in the anti-endothelial cell antibody assay. RESULTS After transfection, clones of homologous cell populations showed an extended lifespan, before entering a period of crisis. In one human umbilical vein endothelial cell clone a subpopulation of cells escaped crisis and became immortal (EVLC2). Telomerase was activated in this endothelial cell line, resulting in maintenance of the telomere length. There was a significant correlation between anti-endothelial cell antibody testing on human umbilical vein endothelial cells and on the cell line EVLC2. CONCLUSION The Simian Virus 40 large T-antigen immortalized human umbilical vein endothelial cell line EVLC2 may be useful for the detection of anti-endothelial cell antibodies.
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Wymenga LF, Wisman GB, Veenstra R, Ruiters MH, Mensink HJ. Telomerase activity in needle biopsies from prostate cancer and benign prostates. Eur J Clin Invest 2000; 30:330-5. [PMID: 10759882 DOI: 10.1046/j.1365-2362.2000.00636.x] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
Abstract
BACKGROUND Telomerase activation is thought to be essential for the immortality of cancer cells. It may be a prognostic factor in small volume well differentiated prostate cancers and hence a guide for the aggressiveness of the approach. The length of the chromosome tips (telomeres) are maintained by a specific enzyme (telomerase) independently of the normal cell division cycle. Although telomerase is not expressed in most normal human tissues, it is expressed in most human tumours. For the detection of telomerase in small prostate needle biopsy samples a recently developed telomeric repeat amplification protocol (TRAP) assay was used. The aim of the present study was: to measure telomerase activity in human prostate samples, and to evaluate the applicability of this assay on specimens from a prostate biopsy. MATERIALS AND METHODS From 36 patients referred for lower urinary tract symptoms (LUTS) or suspicion of having prostate cancer a total of 288 prostate biopsy samples were obtained (8 in each patient). When the digital rectal examination was abnormal and/or when the PSA level was elevated in L.U.T.S., or asymptomatic patients' tissue samples were obtained by transrectal ultrasound (TRUS) guided biopsies. Samples were tested for telomerase activity by a modified TRAP and forwarded for histology. RESULTS In 19 out of 36 patients prostate cancer was diagnosed on histology. In 11 of these 19 tumours substantial telomerase activity was detected, whereas only very low telomerase activity existed in 2 of 17 samples from benign prostatic hypertrophy (BPH) patients. In this small series the relative telomerase activity in prostate cancer correlated with histopathological grade. CONCLUSIONS Our results show the applicability of a TRAP assay to measure telomerase activity in small needle biopsied prostate samples. In poorly differentiated and metastatic cancer we observed that levels of telomerase activity were high. To establish accuracy and to distinguish the 'relative good from the ugly' further study is needed.
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Verselis VK, Veenstra R. Gap junction channels Permeability and voltage gating. ACTA ACUST UNITED AC 2000. [DOI: 10.1016/s1569-2558(00)30005-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/08/2023]
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van Leeuwen EB, Veenstra R, van Wijk R, Molema G, Hoekstra A, Ruiters MH, van der Meer J. Characterization of immortalized human umbilical and iliac vein endothelial cell lines after transfection with SV40 large T-antigen. Blood Coagul Fibrinolysis 2000; 11:15-25. [PMID: 10691096] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/15/2023]
Abstract
Most in vitro studies of human endothelial cells have relied on cells derived from human umbilical veins (HUVEC); however, heterogeneity of primary cultured endothelial cells can make critical interpretation of results difficult. Several endothelial cell lines have been produced to serve as a more constant source of endothelial cells. In this study, we characterized the endothelial cell lines EVLB3 and EVLC2 derived from HUVEC, and EVLK1 and EVLK2 derived from human iliac vein endothelial cells (HIVEC). These cell lines maintained the typical endothelial cell cobblestone morphology and appeared to be growth factor independent. They lost PECAM-1 and von Willebrand factor, GP96 was reduced to the level of vascular smooth muscle cells (SMC), but aSMC-actin was far less than in vascular SMC. Antigen levels of tissue-type plasminogen activator (tPA) and plasminogen activator inhibitor (PAI-1) were comparable with young endothelial cells, and mRNA was present for tPA, PAI-1, tissue factor (TF), tissue factor pathway inhibitor and thrombomodulin. This study revealed that mRNA and protein expression of coagulation and fibrinolytic factors was influenced by the stage of cell confluence. No differences could be detected between the endothelial cell lines derived from HUVEC and HIVEC. These cell lines may be a useful tool for studies on cellular interactions of fibrinolytic components or exploring the regulation of TF expression.
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Joyner RW, Veenstra R, Rawling D, Chorro A. Propagation through electrically coupled cells. Effects of a resistive barrier. Biophys J 1984; 45:1017-25. [PMID: 6733238 PMCID: PMC1434963 DOI: 10.1016/s0006-3495(84)84247-2] [Citation(s) in RCA: 65] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023] Open
Abstract
Action potential propagation through cardiac tissue occurs in a spatially inhomogeneous three-dimensional electrical syncytium composed of discrete cells with regional variations in membrane properties and intercellular resistance. In comparison with axons, cardiac tissue presents some differences in the application of core conductor cable theory. We have used analytical and numerical techniques to contrast the propagation of action potentials along nerve axons and along cardiac strands, including an explicit inclusion of cellular anatomical factors (the surface-to-volume ratio), the strand radius, and the regional distribution of longitudinal resistance. A localized decrease in the number of gap junctions will produce a functional resistive barrier, which can lead to unidirectional block of propagation if the tissue on two sides of the barrier in either excitability or passive electrical load. However, in some circumstances, a resistive barrier separating regions of different electrical load can actually facilitate propagation into the region of larger electrical load.
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Joyner RW, Picone J, Veenstra R, Rawling D. Propagation through electrically coupled cells. Effects of regional changes in membrane properties. Circ Res 1983; 53:526-34. [PMID: 6627611 DOI: 10.1161/01.res.53.4.526] [Citation(s) in RCA: 44] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
Abstract
The normal process of excitation of the heart involves propagation of action potentials through cardiac regions of different anatomy and different intrinsic membrane properties. Although our understanding of these properties is still incomplete, it is well accepted that the parameters measured from a single cell penetration in an electrical syncytium (e.g., action potential duration, rate of rise, and velocity) reflect not only the properties of that cell but also the electrotonic interactions with other cells to which the recorded cell is electrically coupled. We have used simulation techniques to predict the spatial distribution of action potential parameters resulting from discretely localized alterations in the intrinsic membrane properties of some of the cells of an electrical syncytium. We have shown that the resulting spatial distribution is markedly different for alterations in plateau and pacemaker currents vs. rising phase currents, and that other factors, such as the site of stimulation and the underlying spatial pattern of cell-cell coupling resistance, also modify the spatial distribution of action potential properties resulting from a discrete regional change in intrinsic membrane properties.
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Bar RS, Peacock ML, Spanheimer RG, Veenstra R, Hoak JC. Differential binding of insulin to human arterial and venous endothelial cells in primary culture. Diabetes 1980; 29:991-5. [PMID: 7002674 DOI: 10.2337/diab.29.12.991] [Citation(s) in RCA: 27] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
Abstract
The properties of 125I-insulin binding were assessed in endothelial cells prepared from the veins and the arteries of human umbilical cords. The endothelial nature of both the natural and venous cultures were documented by the presence of characteristic endothelial features, including Weibel-Palade bodies, factor VIII antigen, and morphology. Both arterial and venous cells possessed typical receptors for insulin on the basis of specificity of binding, curvilinear Scatchard plots, affinity profiles, pH dependency, and dissociation kinetics. Arterial cells bound at least 2.5 times more insulin than did venous cells, whether studied at 4 h, 24 h, or 72 h after in vitro plating. We conclude that (1) specific receptors for insulin are present on human arterial as well as human venous endothelial cells and (2) the concentration of insulin receptors varies among endothelial cells derived from different vascular sources.
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