Tratamiento extracorporal del pulmón con un péptido cíclico de formula x1-gqretpegaeakpwy-x2

Un método para mejorar las funciones de un pulmón donante extracorpóreamente, que comprende tratar un pulmón ex vivo con un compuesto ciclado de la secuencia de aminoácidos de fórmula X1-GQRETPEGAEAKPWY-X2 I donde X1 comprende un aminoácido (secuencia) con 1 a 4, en particular 1 a 3 miembros, que comprende aminoácidos naturales o no naturales, y X2 comprende un aminoácido, seleccionado de aminoácidos naturales. A method of conditioning/improving lung functions extracorporeally by treatment of a lung ex vivo with a cyclized compound of the amino acid sequence of formula X1-GQRETPEGAEAKPWY-X2 I wherein X1 comprises an amino acid (sequence) with 1 to 4 members, comprising natural or unnatural amino acids, and X2 comprises one amino acid, selected from natural amino acids; and a pharmaceutical composition, comprising a peptide of formula I as defined in any one of claims 1 to 7, in a form, which is appropriate for spraying to obtain an aerosol for inhalation, or which is appropriate for the preparation of a spray to obtain an aerosol upon spraying, which is appropriate for inhalation.