Cannabinoid receptors 1 and 2 oppositely regulate epidermal permeability barrier status and differentiation.

Cannabinoid receptors (CBR) 1 and 2 have been implicated in keratinocyte differentiation/proliferation. How CB receptors affect epidermal permeability barrier and stratum corneum structure and function remains unclear. Permeability barrier abrogation was induced by sequential tape-stripping of the SC and assessed in both CB1R and CB2R knockout (-/-) mice in comparison with wild-type (+/+) littermates.

Actin dynamics regulate immediate PAR-2-dependent responses to acute epidermal permeability barrier abrogation.

Background: Lamellar body (LB) secretion and terminal differentiation of stratum granulosum (SG) cells are signaled by both protease activated receptor-2 (PAR-2) and caveolin-1 (cav-1).

Objective: To address the early dynamics of LB secretion, we examined cytoskeletal remodeling of keratinocytes in 3 mouse models following acute barrier abrogation: hairless mice, PAR-2 knockout (-/-) and cav-1 -/-.

Methods And Results: Under basal conditions, globular (G)-actin accumulates in SG cells cytosol, while filamentous (F)-actin is restricted to peri-membrane domains.

Therapeutic considerations for severe nodular acne.

Severe nodular acne, defined as grade 4 or 5 acne on the Investigator's Static Global Assessment scale, is a skin condition characterized by intense erythema, inflammation, nodules, cysts, and scarring. Both the well known risk of physical scarring and the more recent recognition that acne can be a chronic, psychologically distressing disease with significant adverse effects on a patient's quality of life, have prompted earlier, more aggressive treatment with more effective medications, in the hope of preventing progression to more severe, nodular forms of the disease. Oral antibacterials, primarily tetracyclines, have long been the first-line therapy for severe nodular acne, which frequently remained refractory to therapy.

The development of antimicrobial resistance due to the antibiotic treatment of acne vulgaris: a review.

Objective: To review recent studies on the use of antibiotics in acne vulgaris which provide insight into the development of antimicrobial resistance.

Data Sources: Sources for this article were identified by searching the English literature by Medline for the period 1960 to March 2009.

Study Selection: The following relevant terms were used: acne, acne vulgaris, acne and antibiotic therapy, acne and antimicrobial resistance, acne and resistance mechanisms, acne and systemic infections, acne and antibiotic resistance and coagulase-negative Staphylococcus aureus (S.

LEKTI-1 in sickness and in health.

The stratum corneum (SC) is a biosensor that mediates responses to a variety of exogenous insults through various signalling mechanisms, including the activation of SC serine proteases (SP) kallikrein cascade. The SPINK5 gene encodes an SP inhibitor, the lympho-epithelial-Kazal-type-1 inhibitor (LEKTI-1), which in turn will buffer the excess of SP cascade initiation, key in the maintenance of permeability barrier homeostasis. We demonstrate that LEKTI processing can occur within the SC after secretion from stratum granulosum keratinocytes at least partially by klk7, an SC-specific chymotryptic SP.