The Roles of Bursal Nonapeptide (BP9) on AIV Vaccine Immune Response in Chick Immunization and on Avian Immature B Cell.

BACKGROUND: Bursa of Fabricius plays the vital functions on B cell development and antibody production in poultry. The bursal-derived peptide plays the essential roles on avian immature B cell development. OBJECTIVES: Here we explored the functions of the recently reported bursal nonapeptide (BP9) on the antibody production and the molecular basis of BP9 on avian immature B cell. METHODS: Chicken were twice immunized with Avian Influenza Virus (AIV) inactivated vaccine plus with BP9 at three dosages, respectively. On two weeks after the second immunization, sera samples were collected from all experimental groups to measure AIV-specific Agglutination Inhibition (HI) antibody titers. Also, on 7th day after the second immunization, spleen lymphocytes were isolated from the immunized chicken to detect the lymphocyte viabilities. DT40 cells were treated with BP9 from 0.02 to 2 µg/mL for 4 and 20h to detect sIgM mRNA levels, and total RNAs from BP9-treated DT40 cells were collected to investigate the gene expression profiles of DT40 cells, and to analyze the enriched pathways and functional biological processes. Finally, nine gene expressions were validated with quantitative PCR (qPCR). RESULTS: Our investigation proved the strong regulatory roles of BP9 on AIV-specific HI antibody titers and lymphocyte viabilities. BP9 promoted sIgM mRNA levels in DT40 cells, and upregulated 598 gene expressions and downregulated 395 gene expressions in DT40 cells with 0.2µg/mL BP9 treatment. Moreover, our findings verified the significantly enriched six pathways and various the biological functional processes of BP9 on avian immature B cell. Also, we found eight signaling pathways in the enriched biological processes of BP9-treated DT40 cells, and the expressions of nine selected genes with qPCR were identical to that of microarray data. CONCLUSION: BP9 promoted the antibody production in the 21-old-day chicken immunization, and stimulated the sIgM expression in DT40 cells. Furthermore, we analyzed the gene expression profile and immune-related biological processes of DT40 cells treated with BP9, which provided some new insights into the mechanism on immature B cell development, and provided important references for adjuvant development on vaccine improvement and clinical application.

Confidence intervals for predictive values with an emphasis to case-control studies.

The accuracy of a binary-scale diagnostic test can be represented by sensitivity (Se), specificity (Sp) and positive and negative predictive values (PPV and NPV). Although Se and Sp measure the intrinsic accuracy of a diagnostic test that does not depend on the prevalence rate, they do not provide information on the diagnostic accuracy of a particular patient. To obtain this information we need to use PPV and NPV. Since PPV and NPV are functions of both the accuracy of the test and the prevalence of the disease, constructing their confidence intervals for a particular patient is not straightforward. In this paper, a novel method for the estimation of PPV and NPV, as well as their confidence intervals, is developed. For both predictive values, standard, adjusted and their logit transformed-based confidence intervals are compared using coverage probabilities and interval lengths in a simulation study. These methods are then applied to two case-control studies: a diagnostic test assessing the ability of the e4 allele of the apolipoprotein E gene (ApoE.e4) on distinguishing patients with late-onset Alzheimer's disease (AD) and a prognostic test assessing the predictive ability of a 70-gene signature on breast cancer metastasis.

Alcohol-related advice for Veterans Affairs primary care patients: Who gets it? Who gives it?

OBJECTIVE: Most patients who misuse alcohol do not receive alcohol counseling from their providers. This study evaluated primary care patient and provider characteristics associated with receipt of alcohol-related advice and whether patients were advised to drink less or to abstain. METHOD: Outpatients from seven Veterans Affairs (VA) general medicine clinics were eligible if they screened positive for alcohol misuse, completed the Alcohol Use Disorders Identification Test (AUDIT) and answered questions about alcohol-related treatment and advice. Hierarchical logistic regression was used to evaluate patient and provider characteristics associated with patient reports of alcohol-related advice from a primary care provider in the past year. RESULTS: Among 5191 patients with alcohol misuse in the past year, 1554 (30%) reported receiving alcohol-related advice from their primary care provider during that time. Of patients advised, 73% reported advice to abstain. The likelihood of reporting advice increased as AUDIT scores increased: from 13% of patients with AUDIT scores <8 to 71% of those with scores > or =20. After adjustment for important confounders, measures reflecting the severity of alcohol misuse were most strongly associated with receipt of alcohol-related advice. Adjusted analyses also revealed increased odds of receiving advice among patients who reported liver disease, hypertension, current smoking or continuity of care. No measured provider characteristic was associated with giving advice in the fully adjusted model. CONCLUSIONS: This multisite VA study found that most patients with alcohol misuse did not receive alcohol counseling from a primary care provider. Moreover, providers predominantly offered advice to abstain, and they appeared to focus on patients with the most severe problems due to drinking or medical contraindications to drinking.