scholarly journals Seasonal and Daytime Variation in Multiple Immune Parameters in Humans: Evidence from 329,261 Participants of the UK Biobank Cohort

2020 ◽  
Author(s):  
Cathy Wyse ◽  
G O’Malley ◽  
Andrew N. Coogan ◽  
Daniel J. Smith
Keyword(s):  
Population Level ◽  
Time Of Day ◽  
Confounding Factors ◽  
Uk Biobank ◽  
Immune Parameters ◽  
Cell Counts ◽  
Blood Cell Counts ◽  
White Blood Cell Counts ◽  
The Uk ◽  
Daytime Variation

AbstractBackgroundSeasonal disease outbreaks are perennial features of human infectious disease but the factors generating these patterns are unclear. In animal studies, seasonal and circadian (daily) rhythms in immune function generate periodicity in vulnerability to disease, although it is not known whether the same applies to humans. Making use of extensive data from the UK Biobank cohort, we investigate seasonal and daytime variability in multiple immune parameters (inflammatory markers, white blood cell counts and antibody titres), and test for associations with a wide range of environmental and lifestyle factors.Methods and FindingsMarkers of inflammation (CRP), and white blood cell counts were measured between 8am and 7pm over a 4-year time period in 329,261 participants in UK Biobank. Individual-level data were linked to other factors that vary over seasonal and daily cycles, including changes in day length, outdoor temperature and vitamin D at the time the blood sample was collected. Analyses were further adjusted for potentially confounding lifestyle factors. Seasonal patterns were evident in lymphocyte and neutrophil counts, and CRP, but not monocytes, and these were independent of lifestyle, demographic and environmental factors. All the immune parameters assessed demonstrated significant daytime variation that was independent of confounding factors.ConclusionsAt a population level, human immune parameters vary across season and across time of day, independent of multiple confounding factors. Both season and time of day are fundamental dimensions of immune function that should be considered in all studies of immuno-prophylaxis and disease transmission. Strategic alignment of human activities to seasons and times of the day when we are less susceptible to infection could be an important additional tool for limiting population-level impacts of infectious diseases.

scholarly journals Hematological parameters and prevalence of anemia in white and British Indian vegetarians and nonvegetarians in the UK Biobank

2019 ◽  
Vol 110 (2) ◽  
pp. 461-472 ◽  
Author(s):  
Tammy Y N Tong ◽  
Timothy J Key ◽  
Kezia Gaitskell ◽  
Timothy J Green ◽  
Wenji Guo ◽  
...  
Keyword(s):  
Blood Cell ◽  
White Blood Cell ◽  
Hematological Parameters ◽  
Diet Group ◽  
Uk Biobank ◽  
Platelet Counts ◽  
Cell Counts ◽  
Blood Cell Counts ◽  
White Blood Cell Counts ◽  
The Uk

ABSTRACTBackgroundThere may be differences in hematological parameters between meat-eaters and vegetarians.ObjectiveThe aim of this study was to perform cross-sectional analyses of hematological parameters by diet group in a large cohort in the United Kingdom.MethodsA complete blood count was carried out in all UK Biobank participants at recruitment (2006–2010). We examined hemoglobin, red and white blood cell counts, and platelet counts and volume in regular meat eaters (>3 times/wk of red/processed meat consumption, n = 212,831), low meat eaters (n = 213,092), poultry eaters (n = 4815), fish eaters (n = 10,042), vegetarians (n = 6548), and vegans (n = 398) of white ethnicity and meat eaters (n = 3875) and vegetarians (n = 1362) of British Indian ethnicity.ResultsIn both white and British Indian populations, compared with regular meat eaters (or meat eaters in Indians), the other diet groups had up to 3.7% lower age-adjusted hemoglobin concentrations (difference not significant in white vegan women) and were generally more likely to have anemia (e.g., 8.7% of regular meat eaters compared with 12.8% of vegetarians in white premenopausal women; P < 0.05 after Bonferroni correction). In the white population, compared with regular meat eaters, all other diet groups had lower age- and sex-adjusted total white cells, neutrophils, lymphocytes, monocytes, and eosinophils (P-heterogeneity < 0.001 for all), but basophil counts were similar across diet groups; in British Indians, there was no significant difference in any of the white blood cell counts by diet group. Compared with white regular meat eaters, the low meat eaters, poultry eaters, fish eaters, and vegans had significantly lower platelet counts and higher platelet volume, whereas vegetarians had higher counts and lower volume. Compared with British Indian meat eaters, vegetarians had higher platelet count and lower volume.ConclusionsIn the UK Biobank, people with low or no red meat intake generally had lower hemoglobin concentrations and were slightly more likely to be anemic. The lower white blood cell counts observed in low and non-meat eaters, and differences in mean platelet counts and volume between diet groups, warrant further investigation. This observational study was registered at http://www.isrctn.com/ as ISRCTN10125697.

Abstract 607: Clonal hematopoiesis alters blood cell counts in the UK Biobank

2019 ◽  
Author(s):  
Mitchell J. Machiela ◽  
Weiyin Zhou ◽  
Erikka Loftfield ◽  
Meredith Yeager ◽  
Neal D. Freedman ◽  
...  
Keyword(s):  
Blood Cell ◽  
Uk Biobank ◽  
Clonal Hematopoiesis ◽  
Cell Counts ◽  
Blood Cell Counts ◽  
The Uk

scholarly journals Seasonal and Daytime Variation in Multiple Immune Parameters in Humans: Evidence from 329,261 Participants of the UK Biobank Cohort

iScience ◽  
2021 ◽  
pp. 102255
Author(s):  
Cathy Wyse ◽  
Grace O’Malley ◽  
Andrew N. Coogan ◽  
Sam McConkey ◽  
Daniel J. Smith
Keyword(s):  
Uk Biobank ◽  
Immune Parameters ◽  
The Uk ◽  
Daytime Variation

Fibrinogen, Viscosity and White Blood Cell Count Predict Myocardial, but not Cerebral Infarction: Evidence from the Caerphilly and Speedwell Cohort

2002 ◽  
Vol 87 (03) ◽  
pp. 421-425 ◽  
Author(s):  
Janet Pickering ◽  
Peter Elwood ◽  
Antony Bayer ◽  
Shah Ebrahim ◽  
Ian Baker
Keyword(s):  
Heart Disease ◽  
Blood Cell ◽  
Ischaemic Heart Disease ◽  
White Blood Cell ◽  
Plasma Viscosity ◽  
Confounding Factors ◽  
Blood Cell Count ◽  
Cell Counts ◽  
Blood Cell Counts ◽  
White Blood Cell Counts

SummaryFibrinogen, plasma viscocity, and the white blood cell count predict ischaemic heart disease, but there is less certainty for their predictive power for ischaemic stroke. Studying stroke and ischaemic heart disease in the same cohort prospectively allows comparison of predictive strengths. The Caerphilly and Speedwell cohorts consist of a population sample of 4,860 men aged 45-59 years at recruitment who had baseline measurements of fibrinogen, plasma viscosity, and white blood cell counts. After 15-19 years of follow-up, men in the two cohorts experienced 312 ischaemic strokes and 557 ischaemic heart disease events. Mean fibrinogen, plasma viscosity and white blood cell counts differed significantly after adjustment for confounding factors between men with and without ischaemic heart disease, 0.25 g/l (95% CIs 0.18-0.32); 0.036 cp (95% CIs 0.027-0.044); 0.67 X 109/l (95% CIs 0.50-0.84) respectively. The same measurements showed no significant differences after adjustment for the same confounding factors for men with and without ischaemic stroke, 0.05 g/l (95% CIs -0.04-0.14); 0.008 cp (95% CIs -0.003-0.019); 0.16 X 109/l (95% CIs -0.06-0.38) respectively.

Abstract 607: Clonal hematopoiesis alters blood cell counts in the UK Biobank

2019 ◽  
Author(s):  
Mitchell J. Machiela ◽  
Weiyin Zhou ◽  
Erikka Loftfield ◽  
Meredith Yeager ◽  
Neal D. Freedman ◽  
...  
Keyword(s):  
Blood Cell ◽  
Uk Biobank ◽  
Clonal Hematopoiesis ◽  
Cell Counts ◽  
Blood Cell Counts ◽  
The Uk

An Alternative Elastase-mediated Degradation of Fibrinogen and Fibrin Observed in a Patient with Herpes Simplex Encephalitis and Pneumonia

1996 ◽  
Vol 76 (02) ◽  
pp. 184-186 ◽  
Author(s):  
Kenji lijima ◽  
Fumiyo Murakami ◽  
Yasushi Horie ◽  
Katsumi Nakamura ◽  
Shiro Ikawa ◽  
...  
Keyword(s):  
Herpes Simplex ◽  
Blood Cell ◽  
White Blood Cell ◽  
Herpes Simplex Encephalitis ◽  
Pmn Elastase ◽  
Cell Counts ◽  
Blood Cell Counts ◽  
Sds Page ◽  
White Blood Cell Counts ◽  
Pmn Élastase

SummaryA 74-year-old female developed pneumonia following herpes simplex encephalitis. Her white blood cell counts reached 28,400/μl, about 90% of which consisted of granulocytes. The polymorphonuclear (PMN) elastase/α1-arantitrypsin complex levels increased and reached the maximum of 5,019 ng/ml, indicating the release of a large amount of elastase derived from the granulocytes. The mechanism of PMN elastase release was most likely to be granulocyte destruction associated with phagocytosis. The cleavage of fibrinogen and fibrin by PMN elastase, independent of plasmin, was indicated by the presence of the fragments in immunoprecipitated plasma from the patient corresponding to elastase-induced FDP D and DD fragments and the absence of fragments corresponding to plasmin-induced FDP D and DD fragments on SDS-PAGE. These findings suggested that the large amount of PMN elastase released from the excessive numbers of granulocytes in this patient with herpes simplex encephalitis and pneumonia, induced the cleavage of fibrinogen and fibrin without the participation of plasmin.

scholarly journals Three Manual Noncommercial Methods to Prepare Equine Platelet-Rich Plasma

Animals ◽  
2021 ◽  
Vol 11 (6) ◽  
pp. 1478
Author(s):  
Lorenzo G. T. M. Segabinazzi ◽  
Giorgia Podico ◽  
Michael F. Rosser ◽  
Som G. Nanjappa ◽  
Marco A. Alvarenga ◽  
...  
Keyword(s):  
Blood Transfusion ◽  
Platelet Rich Plasma ◽  
Upright Position ◽  
Platelet Counts ◽  
Cell Counts ◽  
Blood Cell Counts ◽  
Platelet Concentration ◽  
Manual Methods ◽  
White Blood Cell Counts ◽  
Over Time

In light of PRP’s increasing popularity in veterinary practice, this study aimed to compare three manual methods to prepare and cool equine PRP. The blood of 18 clinically healthy mares was collected via venipuncture in a blood transfusion bag (method 1), blood tubes (method 2), and a syringe (method 3). In method 1, samples were double centrifuged; method 2 involved one centrifugation, and in method 3 the syringe was kept in an upright position to sediment for 4 h. After processing with three methods, PRP and platelet-poor plasma (PPP) were extracted and assessed for red (RBC) and white blood cell counts (WBC), platelet counts, and viability. In a subset of mares (n = 6), samples were processed with the three methods, and PRP was evaluated at 6 and 24 h postcooling at 5 °C. Method 1 resulted in the highest and method 3 in the lowest platelet concentration (p < 0.05), and the latter also had greater contamination with WBC than the others (p < 0.001). Platelet viability was similar across treatments (p > 0.05). Cooling for 24 h did not affect platelet counts in all methods (p > 0.05); however, platelet viability was reduced after cooling PRP produced by method 3 (p = 0.04), and agglutination increased over time in all methods (p < 0.001). The three methods increased (1.8–5.6-fold) platelet concentration in PRP compared to whole blood without compromising platelet viability. In conclusion, all three methods concentrated platelets and while cooling affected their viability. It remains unknown whether the different methods and cooling would affect PRP’s clinical efficacy.

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