Stefanie Behrens-Williams

PubMed2003

Increased epidermal functioning wild-type p53 expression in vitiligo.

Despite the lack of protective melanin and increased oxidative stress due to mM concentrations of epidermal H2O2 in vitiligo, there is no significantly increased risk for chronic actinic damage and non-melanoma skin cancer. Therefore the question arises, which protective mechanisms could be involved in the skin of these patients preventing the initiation of these cancers. Recently an overexpression of p53 has been shown in vitiligo. Unfortunately there was no further characterization of this elevated p53. Employing a functional colour yeast assay, the study presented herein demonstrates for the first time the overexpression of a functioning wild-type p53 protein in both depigmented and 'normal' pigmented epidermis of patients with vitiligo compared with healthy controls. Surprisingly long-term narrowband UVB (311 nm) treatment does not alter this expression. Moreover, MDM-2, PCNA and p21 protein expression remain unchanged compared with healthy controls. This increased epidermal p53 in vitiligo coincides with decreased thioredoxin reductase (TR) protein levels in both depigmented and pigmented skin whereas mRNA expression is unaffected. Because TR is one transcriptional target of p53, these results support a wild-type functionality, which was further supported by the specific p53 FASAY yeast test. To our knowledge this is the first example of persistent elevated functioning wild-type p53 in humans. Based on our results we hypothesize that the low incidence for actinic damage, basal cell and squamous cell carcinoma as documented in vitiligo could well reside in a protective function of up-regulated wild-type p53.

Adolescent↗

PubMed2003

[Cosmetic dermatology in German dermatology departments--outcome of a national survey].

The demand for non-surgical cosmetic treatments has grown considerably in recent years. It appears German dermatology departments now also increasingly seem to offer many of these methods. In 2001 we evaluated the use of different non-surgical cosmetic techniques in German dermatology departments through means of a national questionnaire. Information was requested from 85 departments, of which 63.5% responded. The outcome revealed that 96.3% of the participating departments have lasers at their disposal to treat cosmetic skin lesions, 79.6% carry out injections with botulinum toxin, 59.3% perform chemical peels and 37% perform tissue augmentation with injectable fillers. Overall, the ratio between desired and adverse effects as well as the economic benefit of all evaluated methods was judged as positive by the interviewees. In a comparison of all evaluated modalities, the therapeutic index was considered most favourable with botulinum toxin and most unfavourable with injectable filling agents. With regard to cost-effectiveness, soft tissue augmentation was judged best, while chemical peels alongside lasers were regarded as least advantageous in this respect. Further evaluated topics were indications, substances, organisation and other issues. In summary the survey confirmed that a large number of German dermatology departments employ non-surgical cosmetic procedures matching the international upward trend of cosmetic dermatology.

Cosmetic Techniques↗