Could basement membrane alterations, resembling micro-wounds at the dermo-epidermal junction in psoriatic non-lesional skin, make the skin susceptible to lesion formation?

Current data suggest that tissue microenvironment control immune functions. Therefore, understanding the tissue environment in which immune activation occurs will enhance our capability to interfere with abnormal immune pathology. Here, we argue that studying the constitutively abnormal functions of clinically uninvolved psoriatic skin in patients with plaque type psoriasis is very important to better understand psoriasis pathobiology, because non-lesional skin provides the tissue environment in which the psoriatic lesion develops. A key question in psoriasis is what initiates the abnormal, uncontrolled immune activation in the first place and the answer may lie in the skin. In light of this concept, we summarize abnormalities at the dermal-epidermal junction region which shows a special "non-healing-like" micro-wound phenotype in the psoriatic non-lesional skin that may act as a crucial susceptibility factor in the development of the disease.

Differential role of D cyclins in the regulation of cell cycle by influencing Ki67 expression in HaCaT cells.

D-type cyclins are important regulatory proteins of the G1/S phase of the cell cycle however, their specific functions are only partially understood. We show that silencing of individual D-type cyclins has no effect on the proliferation and morphology of Immortalized non-tumorigenic human epidermal (HaCaT) cells, while double and triple D cyclin silencing results in the failure of the cytokinesis leading to the appearance of large multinucleated cells. Both CDC20 and Ki67 mRNA is downregulated in these cells. Ki67 mRNA silenced cells show similar multinucleated cellular phenotype as double or triple D cyclin silenced cells without affecting D cyclin expression, suggesting that Ki67 is necessary for normal G2/M transition. Our data have revealed that cyclin D1 may have a leading role in G1/S phase regulation and suggest an incomplete functional overlap among D cyclins. Our results indicate that beside their well-known functions during the G0-G1/S phase, D-type cyclins play a pivotal role in the regulation of mitosis via influencing Ki67 expression in a downstream manner probably through E2F1 activation in HaCaT cells.

In vitro dedifferentiation of melanocytes from adult epidermis.

In previous work we described a novel culture technique using a cholera toxin and PMA-free medium (Mel-mix) for obtaining pure melanocyte cultures from human adult epidermis. In Mel-mix medium the cultured melanocytes are bipolar, unpigmented and highly proliferative. Further characterization of the cultured melanocytes revealed the disappearance of c-Kit and TRP-1 and induction of nestin expression, indicating that melanocytes dedifferentiated in this in vitro culture. Cholera toxin and PMA were able to induce c-Kit and TRP-1 protein expressions in the cells, reversing dedifferentiation. TRP-1 mRNA expression was induced in dedifferentiated melanocytes by UV-B irradiated keratinocyte supernatants, however direct UV-B irradiation of the cells resulted in further decrease of TRP-1 mRNA expression. These dedifferentiated, easily accessible cultured melanocytes provide a good model for studying melanocyte differentiation and possibly transdifferentiation. Because melanocytes in Mel-mix medium can be cultured with human serum as the only supplement, this culture system is also suitable for autologous cell transplantation.

Risk factors for suicide in Hungary: a case-control study.

BACKGROUND: Hungary previously had one of the highest suicide rates in the world, but experienced major social and economic changes from 1990 onwards. We aimed to investigate the antecedents of suicide in Hungary. We hypothesised that suicide in Hungary would be associated with both risk factors for suicide as identified in Western studies, and experiences related to social and economic restructuring. METHODS: We carried out a controlled psychological autopsy study. Informants for 194 cases (suicide deaths in Budapest and Pest County 2002-2004) and 194 controls were interviewed by clinicians using a detailed schedule. RESULTS: Many of the demographic and clinical risk factors associated with suicide in other settings were also associated with suicide in Hungary; for example, being unmarried or having no current relationship, lack of other social contacts, low educational attainment, history of self-harm, current diagnosis of affective disorder (including bipolar disorder) or personality disorder, and experiencing a recent major adverse life event. A number of variables reflecting experiences since economic restructuring were also associated with suicide; for example, unemployment, concern over work prospects, changes in living standards, practising religion. Just 20% of cases with evidence of depression at the time of death had received antidepressants. CONCLUSION: Suicide rates in Hungary are falling. Our study identified a number of risk factors related to individual-level demographic and clinical characteristics, and possibly recent societal change. Improved management of psychiatric disorder and self-harm may result in further reductions in suicide rates.

The altered expression of syndecan 4 in the uninvolved skin of venous leg ulcer patients may predispose to venous leg ulcer.

Syndecan 4 (SDC4), a heparan sulfate proteoglycan, and neuropilin 1 (NRP1), a transmembrane receptor, are both involved in normal wound healing, but little is known about their possible role in venous leg ulcer pathogenesis. We aimed to investigate whether there are any expression abnormalities and/or gene polymorphisms of SDC4 and NRP1 associated with venous leg ulcer. SDC4 showed significantly lower mRNA and protein expression in the uninvolved dermis of venous leg ulcer patients (n=15) compared with controls (n=15; p=0.0136), while NRP1 showed no expression abnormalities. None of the examined SDC4 and NRP1 polymorphisms showed a difference in their allelic distribution between leg ulcer patients (n=92) and controls (n=92). We hypothesize that SDC4 may play an essential role not only in the inflammation and tissue formation phases of normal wound healing, but its expression abnormalities observed in the uninvolved dermis of venous leg ulcer patients may contribute to venous leg ulcer development.

Differential expression of D-type cyclins in HaCaT keratinocytes and in psoriasis.

In this study, we show that the G0-G1/S phase of HaCaT keratinocyte cell cycle is characterized by D1-type cyclin expression, whereas during the repeated rapid turnover of highly proliferating cells, the expression of cyclins D2 and D3 dominates. Knocking down cyclin D1 mRNA resulted in no change of cell proliferation and morphology, indicating that D2 and D3 cyclins could substitute for D1 in driving the cell cycle. Increased numbers of cyclin D1-expressing keratinocytes were found in the basal layers of the lesional psoriatic epidermis compared to both normal and non-lesional epidermis without increased expression of cyclin D1 mRNA, suggesting a possible dysfunction in the degradation of cyclin D1 protein. We also detected a significant increase in cyclin D2 and D3 mRNA expressions in psoriatic epidermis compared to normal epidermis with no difference in protein expressions. Blocking alpha5-integrin function by a neutralizing antibody in HaCaT keratinocytes downregulated the expression of cyclin D1 mRNA without affecting the expressions of cyclin D2 and D3 indicating a regulatory role for alpha5-integrin in the expression of cyclin D1. Our data suggest a possible role for D-type cyclins in the excessive basal-cell proliferation and perturbed keratinocyte differentiation in the psoriatic epidermis.

Differentiation-regulated expression of Toll-like receptors 2 and 4 in HaCaT keratinocytes.

Toll-like receptors (TLRs) play an important role in the recognition of pathogens in keratinocytes. In this study, we investigated whether the differentiation state of HaCaT keratinocytes correlates with the expression of TLR2 and TLR4 genes. The expression levels of TLR2 and TLR4 in a HaCaT differentiation model system were determined using quantitative real-time RT-PCR (Q-RT-PCR) and flow cytometry. The progression of keratinocyte differentiation was monitored by determining the level of involucrin gene expression using Q-RT-PCR. The expression levels of TLR2 and TLR4 increased with the stage of differentiation and there were strong correlations between the expression level of the involucrin gene and those of the TLR2 gene ( r=0.809, P<0.0001) and the TLR4 gene ( r=0.568, P<0.02). Increased cell surface expression of TLR2 and TLR4 was also found in differentiated HaCaT keratinocytes by flow cytometric analysis. Our findings suggest that upregulation of TLR expression during differentiation in keratinocytes could be a part of the differentiation process of keratinocytes and could have biological significance in protecting skin against microbes.

Major depressive disorder and response to citalopram treatment in women attending menopause clinic.

INTRODUCTION The authors investigated the prevalence of depressive disorders and response to citalopram among perimenopausal women visiting menopause clinics. METHOD One hundred and eighty-five consecutive outpatients were screened using the short Beck Depression Inventory. A psychiatrist investigated persons who showed medium or severe Beck depression. In the case of DSM-IV major depressive episode, a 6-week open trial with citalopram (20-40 mg daily) was started. The 17-item Hamilton Depression Rating Scale (HDRS) measured the severity of depression at baseline and at weeks 3 and 6. The primary outcome measure was the rate of responders at weeks 3 and 6 (more than 50% drop in the total HDRS score at weeks 3 and 6 compared to baseline). RESULTS Of the 185 consecutive outpatients screened, 48 (26%) have experienced medium or severe Beck depression, and 37 of them (20%) had DSM-IV major depression. Citalopram was started in 30 patients (daily doses ranged from 20 to 40 mg) and 21 (70%) finished the trial. The rate of responders at week 3 was 7/22 (32%) and at week 6 was 13/21 (62%). CONCLUSIONS Depressive disorders are common among perimenopausal women visiting menopause clinics, and the majority of those with depression respond well to citalopram. Interdisciplinary cooperation is the key point of the detection and follow up of these patients.