Rh-epo nasal formulations with low sialic acid concentration...

A - Human Necessities – 61 – K

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Details

A61K 9/72 (2006.01) A61K 38/18 (2006.01) A61P 9/10 (2006.01)

Patent

CA 2616156

The invention relates to the biopharmaceutical industry and, in particular, to the development of a medicament which is intended for the treatment of cerebrovascular, neurodegenerative and psychiatric diseases and which contains, by way of active principle, recombinant human erythropoietin (rh- Epo) with a low sialic acid concentration. During rh-Epo production, the glycoprotein is obtained with a different sialic acid concentration when less than 40 % of the molecule thereof is protected with (basic) sialic acid, in which case it is not biologically active by systemic route and is inactivated by hepatic enzymes. Surprisingly, it was found that nasally-administered basic rh-Epo has greater therapeutic benefits than the acid. The inventive basic rh- Epo nasal formulations include bioadhesive polymers which increase the residence time in the nasal cavity, thereby enhancing the therapeutic effect thereof. Said formulations also include other auxiliary substances, such as preservative substances, surfactants, pH regulators, isotonising agents and protein stabilisers.

La présente invention concerne l'industrie biopharmaceutique et, en particulier, la mise au point d'un médicament utilisé dans le traitement des maladies cérébro-vasculaires, neurodégénératives et psychiatriques, contenant comme principe actif l'érythropoïétine humaine de recombinaison (EPOrh) avec une faible teneur en acide sialique. Au cours de la production de l'EPOrh, on obtient cette glycoprotéine avec une teneur en acide sialique différente lorsque moins de 40 % de sa molécule est protégée avec de l'acide sialique (de base). Elle n'est pas biologiquement active par voie systémique, et désactivée par des enzymes hépatiques. Curieusement, on a découvert que l'EPOrh de base administrée par voie nasale présente des utilités thérapeutiques supérieures à l'acide. Les formulations nasales d'EPOrh de base de l'invention incorporent des polymères bioadhésifs augmentant la durée de résidence dans la cavité nasale, et améliorant son effet thérapeutique. Lesdites formulations contiennent, de plus, d'autres substances auxiliaires telles que des substances de conservation, des tensioactifs, des régulateurs de pH, des agents isotoniques et des stabilisants de protéine.

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