Clinuvel is an Australian biopharmaceutical company developing drugs for individuals with a range of dermatological conditions.
Clinuvel has focused primarily on a drug called SCENESSE® (afamelanotide) which is an injectable implant drug roughly the size of a grain of rice. The active ingredient in SCENESSE® is a peptide called afamelanotide. This is an analogue of a naturally occurring hormone called alpha-Melanocyte Stimulating Hormone (α-MSH). In nature, α-MSH is our body’s response to skin damage from ultraviolet (UV) light. α-MSH binds to receptors (specifically melanocortin 1 receptor or MC1R) in the skin on particular skin cells, melanocytes, which in turn activate our skin’s pigment, melanin. Melanin provides skin cells with color as well as a biological barrier to protect them from UV and light. The skin is visibly darkened when melanin production is activated by α-MSH.
Afamelanotide’s chemical structure differs slightly from natural α-MSH: it has been altered to increase the peptide’s half-life (increasing the length of time it can exist in the blood stream from seconds to minutes) and to increase its ability to bind to MC1R on the melanocyte. As a result, afamelanotide is able to mimic the effects of the natural occurring α-MSH, with a longer lasting effect and increased potency.
Clinuvel has refined afamelanotide’s formulation and chemical structure to reach the current drug formulation: a 16mg afamelanotide controlled release implant, SCENESSE®. SCENESSE® has been formulated to achieve the optimal dose for activating melanin production systemically, while minimizing exposure to the drug and thus reducing possible side effects.
SCENESSE® is administered by physicians in the fatty tissue just above the hip. Approximately two days after administration, SCENESSE’s visible effect can be seen: the skin becomes darker. The drug is only present in the body for approximately ten days however the effect of the drug is seen for 60 days. Hence, in current clinical trials, SCENESSE® is administered once every 60 days. To date, nausea and headaches are the primary side effects reported in clinical trials however the drug has been safely tested in approximately 550 individuals with no reports of serious adverse effects.
For the past five years, SCENESSE® has been trialed for a number of UV and light related skin disorders (conditions called photodermatoses). The most advanced of these programs is for an indication called erythropoietic protoporphyria (EPP), a rare metabolic disorder which causes absolute light intolerance. SCENESSE® has been shown to reduce the number and severity of phototoxic reactions in late stage trials of the drug in individuals with EPP and a confirmatory program is underway in the US and Europe. Pending the outcome of this confirmatory program – due to complete in the first quarter of 2011 – Clinuvel expects to file SCENESSE® for Marketing Authorisation Approval (MAA) with European regulators.
In August 2010, Clinuvel announced it would commence a new program for SCENESSE®, trialing the drug for the first time as a repigmentation therapy in individuals diagnosed with nonsegmental vitiligo. The company is currently making submissions for regulatory and ethics approvals to commence a pilot Phase II study in four centers, two each in the US and Europe, which will evaluate SCENESSE’s ability to repigment skin both as a standalone therapy and as an adjunctive therapy with narrow-band ultraviolet B (NB-UVB) light therapy.
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