Keratinocyte-derived microvesicle particles mediate ultraviolet B radiation-induced systemic immunosuppression.

A complete carcinogen, ultraviolet B (UVB) radiation (290-320 nm), is the major cause of skin cancer. UVB-induced systemic immunosuppression that contributes to photocarcinogenesis is due to the glycerophosphocholine-derived lipid mediator platelet-activating factor (PAF). A major question in photobiology is how UVB radiation, which only absorbs appreciably in the epidermal layers of skin, can generate systemic effects.

Mystery burns and nocturnal seizure safety.

Thermal burn injuries are common and are associated with physical and psychologic repercussions. For epileptic patients, the risk for environmental injuries is remarkably higher. We present 2 cases of thermal burn injuries following nocturnal seizures.