Abstract: Background: Psoriasis is a chronic, inflammatory, relapsing skin disease that has a psychosocial impact on the patients' life. Objective: This study aimed to investigate psychopathology in patients with psoriasis based on a valid psychometric instrument, as well as on the relationship between psychopathology and alexithymia. Methods: 108 patients with psoriasis were included in the study. Psychopathology was evaluated with the Symptom Checklist-90-Revised (SCL-90-R) and alexithymia with the Toronto Alexithymia Scale (TAS-20). Disease severity was clinically assessed using the Psoriasis Area and Severity Index. Results: As regards the psychopathological dimensions, female patients presented with statistically significant higher somatization, depression, anxiety, phobic anxiety, and psychoticism than males. Patients with alexithymia presented with statistically significant higher somatization, interpersonal sensitivity, anxiety, and phobic anxiety than non-alexithymic patients. Alexithymia positively correlated with somatization (r = 0.26, p < 0.01), interpersonal sensitivity (r = 0.24, p < 0.05), depression (r = 0.27, p < 0.01), anxiety (r = 0.26, p < 0.01), and phobic anxiety (r = 0.26, p < 0.01). In addition, alexithymia also contributed to the prediction of these conditions. Study Limitations: A larger study sample could yield safer generalized results. Nevertheless, to the best of our knowledge, this was the first study to investigate various psychopathological dimensions in patients with psoriasis. Conclusions: Our study results indicate that alexithymia and female sex were associated with several psychopathological dimensions in patients with psoriasis. It may be suggested that alexithymia constitutes an important factor in the development of mental disorders among patients with psoriasis.

BACKGROUND: Angiogenesis is an early stage of psoriatic lesion development, but less is known about lymphagiogenesis and its role in the development of psoriasis. OBJECTIVE: To examine the expression of specific lymphatic markers and lymphatic growth factors in untreated psoriatic skin, in the unaffected skin of patients and skin of healthy volunteers, as well as their alteration after treatment with an anti-TNF agent. METHODS: Immunohistochemistry for the lymphatic markers D2-40 and LYVE-1, in addition to the VEGF-C and VEGF-D growth factors, was performed in the skin biopsies of psoriatic lesions and adjacent non-psoriatic skin of 19 patients before and after treatment with etanercept, as well as in the skin biopsies of 10 healthy volunteers. RESULTS: The expressions of D2-40, VEGF-C and VEGF-D on lymphatic vessels underwent statistically significant increases in untreated psoriatic skin compared with non-lesional skin, in contrast to LYVE-1, which did not involve significant increase in expression in psoriatic skin. VEGF-C expression on lymphatic vessels diminished after treatment with etanercept. Moreover VEGF-C and VEGF-D staining on fibroblasts presented with higher expression in lesional skin than in non-lesional adjacent skin. CONCLUSION: Remodeling of lymphatic vessels possibly occurs during psoriatic lesion development, parallel to blood vessel formation. The exact role of this alteration is not yet clear and more studies are necessary to confirm these results.