The human lymphocyte micronucleus (MN) assay is relatively insensitive to genotoxic agents that predominantly induce excision-repairable lesions such as adducts and abasic sites. In this study we have explored the possibility of using cytosine arabinoside (ARA) to convert excision-repairable DNA lesions to micronuclei (MN) within one cell cycle. The system consisted of human lymphocytes as target cells, the cytokinesis-block (CB) method for identifying cells that had completed one nuclear division only, and X-rays, methylnitrosourea (MNU), and ultraviolet light (UV) as mutagens. With each mutagen we have observed significant increments in induced MN in the cultures that had also been treated with ARA during G1. The slope of the dose-response curves for induction of MN was increased by a factor of approximately 1.8 for X-rays and 10.3 for UV and significant MNU induction of MN was only achieved in the cultures treated with ARA. Furthermore, a 24-hr gap between mutagen exposure and the start of the assay did not abolish the increased sensitivity in the cultures treated with ARA. These observations suggested that the combined ARA and cytokinesis-block micronucleus (CBMN) method may enhance the detection of exposure to genotoxic agents that predominantly induce excision-repairable lesions.
Disparities related to barriers to care for HIV-positive and at-risk minorities continue to be a major public health problem. Adaptation of efficacious HIV prevention interventions for use as health communication innovations is a promising approach for increasing minorities' utilization of HIV health and ancillary services. Role model stories, a widely-used, HIV prevention strategy, employ culturally tailored narratives to depict experiences of an individual modeling health risk reduction behaviors. This paper describes the careful development of a contextually appropriate role model story focused on increasing minorities' engagement in HIV/AIDS health and related services. Findings from interviews with community members and focus groups with HIV-positive minorities indicated several barriers and facilitators related to engagement in HIV healthcare and disease management (e.g., patient/provider relationships) and guided the development of role model story narratives.
Four studies completed since 1995 have highlighted the importance of the relationship between the provider and the patient in enhancing adherence behavior. This study extends this work by comparing adherent and nonadherent clients in one high-volume HIV clinic in which the majority of care is provided by nursing staff. The sample comprised 130 clients (108 adherent and 22 nonadherent). Adherence status was determined by clinic staff using established procedures. The indicator of the patient-provider relationship was satisfaction with the care provider as measured within the Patient Satisfaction Questionnaire. Client groups differed significantly on perception of interpersonal manner of care provider (p =.018), care provider conduct total (p <.001), and quality total (p =.017). These findings are consistent with earlier work and underscore the potential importance of the patient-provider relationship as a focus of care for nurses.
The effects of the sequential addition of glucose, noradrenaline, propranolol and oleic acid on the rates of O2 consumption and heat production by isolated interscapular brown adipocytes from control and cafeteria-fed rats were compared. Although the chemical agents produced very similar changes in oxidative metabolism, the actual rates of O2 uptake and heat output in adipocytes from the cafeteria-fed rats, when expressed per g dry wt. of cells, were approx. 65% less than those obtained with cells from the control rats. However, when the same results were expressed per 10(8) multiloccular brown adipocytes, rather than gravimetrically, rates of O2 consumption and heat production were equivalent. Further interpretation of these data is complicated, because the average volume of multiloccular brown adipocytes from cafeteria-fed rats was 2.5 times that for multiloccular cells from control animals.
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