The induction of mouse skin papillomas by initiation-promotion protocols is associated with aberrant expression of epithelial markers in the tumor mass. Similarly, initiation of mouse keratinocytes with a retrovirus encoding the v-rasHa gene (v-rasHa keratinocytes) causes characteristic alterations of epidermal gene expression (A. A. Dlugosz et at, Cancer Res., 54: 6413-6420, 1994). Because act...

We have reported previously that syndecan-1 (Sdc1)-null mice show delayed re-epithelialization after skin and corneal wounding. Here, we show that primary keratinocytes obtained from Sdc1-null mice and grown for 3-5 days in culture are more proliferative, more adherent and migrate more slowly than wt keratinocytes. However, the migration rates of Sdc1-null keratinocytes can be restored to wild-...

The induction of mouse skin papillomas by initiation-promotion protocols is associated with aberrant expression of epithelial markers in the tumor mass. Similarly, initiation of mouse keratinocytes with a retrovirus encoding the v-ras gene (v-ras keratinocytes) causes characteristic alterations of epidermal gene expression (A. A. Dlugosz et al., Cancer Res., 54: 6413–6420, 1994). Because activa...

background: many oral squamous cell carcinomas (osccs) arise within regions that previously had premalignant lesion. early diagnosis and prompt treatment of premalignant lesions offers the best hope of improving the prognosis in patients with oscc. exfoliative cytology is a simple and non-invasive diagnostic technique that could be used for early detection of oral premalignant and malignant les...

background: wet cupping therapy is a complementary therapy in pain management. the mechanism of this therapy, however, needs further elucidation. cells injured by wet cupping therapy seem to stimulate the expression of heat shock protein 70 (hsp70). its benefit in pain reduction could be mediated by the expression of ß-endorphin. this study aimed at determining the correlation between hsp70 and...

We studied the expression of arachidonate 5-lipoxygenase (5-LO) in a cell line of human keratinocytes (HaCaT) and in normal human skin keratinocytes in tissue culture. In undifferentiated keratinocytes 5-LO gene expression was low or undetectable as determined by 5-LO mRNA, protein, cell-free enzyme activity, and leukotriene production in intact cells. However, after shift to culture conditions...

Here we show that keratinocytes in psoriatic lesional skin express increased Toll-like receptor (TLR) 9 that similarly localizes with elevated expression of the cathelicidin antimicrobial peptide LL-37. In culture, normal human keratinocytes exposed to LL-37 increased TLR9 expression. Furthermore, when keratinocytes were exposed to LL-37 and subsequently treated with TLR9 ligands, such as CpG o...

Nerve growth factor (NGF) transcripts were identified in normal human keratinocytes in primary and secondary culture. The expression of the NGF mRNA was strongly down-regulated by corticosteroids and was maximal when keratinocytes were in the exponential phase of growth. Immunofluorescence studies on growing keratinocytes colonies and on elutriated keratinocytes obtained from growing colonies a...

Keratinocytes protect themselves from UV-induced damage and death by signalling to melanocytes produce transfer melanin their nuclei further UV damage. The keratinocyte-melanocyte communication axis defines the tanning response, which is integral epidermal homeostasis. We studied effects of occasional, moderate chronic UVA/UVB exposure on keratinocytes in vitro using immortalised human monocult...

Keloids are proliferative growths of dermal collagen, usually resulting from excessive tissue response during wound healing. There is evidence that keratinocytes may promote keloidogenesis via epithelial-mesenchymal interactions. Metallothioneins (MTs) are known to be involved in the fundamental cellular processes of growth and apoptosis. In this study, we evaluated the expression of MT isoform...