Caring for dependent relatives has become a normative challenge for families in the USA and throughout the world. The study objective was to examine the relationship of family caregiving responsibilities and the mental health and well-being of individuals, ages 18-24 years, referred to as emerging young adults. It was hypothesized that young adult caregivers with past and present responsibilities would report significantly more symptoms of depression and anxiety, have lower self-esteem, and use less adaptive coping styles than non-caregiving peers. The sample consisted of 353 undergraduates (81 past caregivers, 76 current/past caregivers, and 196 non-caregivers). Caregivers were also evaluated in terms of care recipients, duration of caregiving, tasks, and hours of effort. Caregivers had significantly higher levels of symptoms of depression and anxiety than non-caregivers. Research to clarify how caregiving interacts with other stressors in emerging young adults and influences behavioral health should be a priority.
Rapid reperfusion of the infarct-related artery is the cornerstone of therapy for the management of acute ST-elevation myocardial infarction (STEMI). Canada's geography presents unique challenges for timely delivery of reperfusion therapy for STEMI patients. The Canadian
R ESUM ELa reperfusion rapide de l'artère responsable de l'infarctus est la pierre angulaire th erapeutique de la prise en charge de l'infarctus aigu du myocarde avec el evation du segment ST (STEMI). Les caract eristiques g eographiques du Canada posent des d efis particuliers pour prodiguer aux
Aims/hypothesis
Microangiopathy is a leading complication of diabetes that commonly affects the retina. Degenerate capillaries are a central feature of diabetic retinopathy. An inflammatory process has been linked to the development of diabetic retinopathy but its regulation is incompletely understood. Cluster of differentiation (CD) 40 is a member of the TNF receptor superfamily that promotes the development of certain inflammatory disorders. The role of CD40 in diabetic microangiopathy is unknown.
Methods
B6 and Cd40−/− mice were administered streptozotocin to induce diabetes. Leucostasis was assessed using fluorescein isothiocyanate-conjugated concanavalin A. Retinal Icam1 and Cd40 mRNA levels were examined using real-time PCR. Protein nitration was assessed by immunohistochemistry. Histopathology was examined in the retinal vasculature. CD40 expression was assessed by flow cytometry and immunohistochemistry. Intercellular adhesion molecule 1 (ICAM-1) and nitric oxide synthase 2 (NOS2) were examined by immunoblot and/or flow cytometry. Nitric oxide production was examined by immunoblot and Griess reaction.
Results
In mouse models of diabetes, Cd40−/− mice exhibited reduced retinal leucostasis and did not develop capillary degeneration in comparison with B6 mice. Diabetic Cd40−/− mice had diminished ICAM-1 upregulation and decreased protein nitration. Cd40 mRNA levels were increased in the retinas of diabetic B6 mice compared with non-diabetic controls. CD40 expression increased in retinal Müller cells, endothelial cells and microglia of diabetic animals. CD40 stimulation upregulated ICAM-1 in retinal endothelial cells and Müller cells. CD40 ligation upregulated NOS2 and nitric oxide production by Müller cells.
Conclusions/interpretation
CD40-deficient mice were protected from the development of diabetic retinopathy. These mice exhibited diminished inflammatory responses linked to diabetic retinopathy. CD40 stimulation of retinal cells triggered these pro-inflammatory responses.
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