Low perceived social support is associated with CD8+CD57+ lymphocyte expansion and increased TNF-α levels

Analysis of CD15, CD57 and HIF-1α in biopsies of patients with peri-implantitis

Peri-implantitis is an infectious disease characterized by inflammation of the tissues surrounding the implant, bleeding on probing with or without suppuration, and bone loss. Peri-implant lesions contain a leukocyte infiltrate of plasma cells, lymphocytes, macrophages and neutrophils. A survey of the literature did not show any studies reporting an association between hypoxia and peri-implantitis. The aim of the present cross-sectional study was to evaluate histological changes and immunostaining for CD15, CD57 and HIF-1α in the peri-implant mucosa of patients with and without peri-implantitis. Mucosal biopsies were obtained from 18 patients with peri-implantitis and 10 control subjects without peri-implantitis at a private health care center between 2010 and 2012. The sections were fixed in 10% buffered formalin, processed and embedded in paraffin for histopathological and immunohistochemical study. Acanthosis, spongiosis and exocytosis were observed in both groups, with no significant difference between them. The peri-implantitis group showed increased immunostaining for CD15, a neutrophil marker, and HIF-1α, a tissue hypoxia marker, but no significant difference in immunostaining for CD57, a Natural Killer cell marker. The increase in neutrophil (CD15) and hypoxia (HIF-1α) markers in patients with peri-implantitis suggests an active participation of neutrophils and hypoxia in the pathogenesis of this disease. Since the present study was the first to evaluate the expression of CD15, CD57 and HIF-1α in peri-implant tissues, further studies should be performed to better understand the role of these molecules in peri-implantitis.

Relationships among depression during pregnancy, social support and health locus of control among Iranian pregnant women

BACKGROUND

Prenatal depression is a significant predictor of postpartum depression and is detrimental to fetal development.

AIM

To examine whether depression during pregnancy is associated with social support and health locus of control (HLC).

METHOD

Data were collected from a sample of 208 Iranian pregnant women using a demographic questionnaire, the Edinburgh Postnatal Depression Scale, the multidimensional HLC Scale and the social support appraisals.

RESULTS

Depression was experienced by 37% of participants. Overall, women reported higher level of family support (6.88 ± 1.15) than other supports (6.87 ± 1.29). Protective supports from other resources (6.87 ± 1.29) were higher than those from friends (5.94 ± 1.5). Internal, powerful others and chance beliefs had the highest mean scores. Social support and chance HLC significantly influenced the proposed mediator (depressive mood) in the linear regression model. Bivariate analysis showed significant associations between social support (friend, family and others) and depressive mood. Internal HLC had a significant association with social support and powerful others HLC. However, Pearson correlation coefficient was not significant between depressive mood and all dimensions of HLC.

CONCLUSION

Clinicians could assess social support and chance HLC to identify and treat women at risk of prenatal depression. By providing support during pregnancy, depression levels in women and its effects on the fetus may be decreased, which could prevent postpartum depression.

Opposing effects of alcohol on the immune system

Several studies have described a dose-dependent effect of alcohol on human health with light to moderate drinkers having a lower risk of all-cause mortality than abstainers, while heavy drinkers are at the highest risk. In the case of the immune system, moderate alcohol consumption is associated with reduced inflammation and improved responses to vaccination, while chronic heavy drinking is associated with a decreased frequency of lymphocytes and increased risk of both bacterial and viral infections. However, the mechanisms by which alcohol exerts a dose-dependent effect on the immune system remain poorly understood due to a lack of systematic studies that examine the effect of multiple doses and different time courses. This review will summarize our current understanding of the impact of moderate versus excessive alcohol consumption on the innate and adaptive branches of the immune system derived from both in vitro as well as in vivo studies carried out in humans and animal model studies.