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About half of the human genome is composed of ancient transposable elements that integrated the genome through out the evolution. In order to evaluate whether retroelements could be active in the psoriatic lesion, we 1/quantified endogenous reverse transcriptase (RT) activity, 2/localised RT-expressing cells 3/evaluated the effects of RT inhibitors on keratinocyte proliferation and differentiation in a skin culture model.  An increased RT activity was detected in protein extracts from lesional psoriatic skin when compared to normal skin (mean Mn2+-dependent RT activity 191 ± 118 μU/ml (n = 24) vs 71 ± 78 μU/ml (n = 17) and mean Mg2+-dependent RT activity 7.3 ± 4.3 mg/ml (n = 15) vs 2.3 ± 1.93 mg/ml (n = 15); p = 0.0048 and p = 0.0009, respectively). Sera and plasma from healthy and psoriatic individuals were all negative.  By anti-RT antibody staining, we detected few dermal positive cells in normal skin sections (n = 10) as in non-lesional psoriatic skin (n = 10). In contrast, in the lesional skin (n = 20), the granular layer was intensely stained as were Munro's abscesses. In addition, a subset of inflammatory cells was also positive.  In order to evaluate the effects of two RT inhibitors, AZT and Efavirenz, on keratinocyte proliferation and differentiation, we first confirmed the expression of RT proteins in the granular layer of in vitro skin culture. We observed that Efavirenz at 10-5M potently reduced cell proliferation and hyperkeratosis while AZT had little or no effect on keratinocyte differentiation.  These results support that endogenous retroelements are active in the psoriatic lesion and that they also participate in the control of keratinocyte proliferation and differentiation.

Reverse transcriptase activity in psoriatic lesions: effects of reverse transcriptase inhibitors on keratinocyte proliferation and differentiation