Use of conotoxin peptides u002 and mii for treating or...

A - Human Necessities – 61 – K

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A61K 38/10 (2006.01) A61K 38/17 (2006.01) A61K 51/08 (2006.01)

Patent

CA 2223737

The present invention is directed to use of relatively short peptides, spefically the .alpha.-conotoxin peptides MII and U002, for treating patients with small-cell lung carcinoma (SCLC) or for detecting the presence of SCLC tumors. It has been discovered that while MII and U002 bind to neuronal nicotinic receptors as do other .alpha.-conotoxin peptides, they have a significantly lower affinity for neuromuscular receptors. Patients having SCLC are treated in accordance with the present invention by administering, preferably intravenously or intramuscularly, a pharmaceutical composition containing the .alpha.-conotoxin peptide as the active ingredient. The presence or location of SCLC tumors are detected in accordance with the present invention by injecting a subject with MII or U002 labeled with a marker capable of detection and subsequently detecting the binding of the labeled MII or U002 to determine the presence or location of SCLC tumors.

L'invention concerne l'utilisation de peptides relativement courts, particulièrement, les peptides .alpha.-conotoxine MII et U002, afin de traiter des malades atteints du carcinome pulmonaire à petites cellules (SCLC) ou de détecter la présence de tumeurs du type SCLC. On a découvert que les peptides MII et U002, tout en se fixant à des récepteurs nicotiniques neuraux de même que d'autres peptides .alpha.-conotoxine, présentent une affinité nettement inférieure pour les récepteurs neuromusculaires. On traite les malades atteints de SCLC par administration, de préférence intraveineuse ou intramusculaire, d'une composition pharmaceutique contenant le peptide .alpha.-conotoxine en tant qu'ingrédient actif. On détecte la présence ou l'emplacement de tumeurs du type SCLC en injectant au malade le peptide MII ou de U002 marqué au moyen d'un marqueur susceptible d'être détecté, puis en détectant la fixation du peptide MII ou de U002 marqué, afin de déterminer la présence ou l'emplacement de tumeurs du type SCLC.

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