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Eight analogues of DYN A(1-11)-NH2 incorporating the nonhydrolyzable psi [CH2-NH] peptide bond surrogate were tested for their in vitro enzymatic stability in mouse brain homogenates. Results show that the Leu(5)-Arg6 and to a lesser extent the Arg(7)-Ile8 and Ile(8)-Arg9 peptide bonds are the more susceptible to enzymatic cleavage in the native peptide. (Leu5 psi[CH(2)-NH]Arg6)DYN A(1-11)-NH2 exhibits an almost complete resistance to enzymatic cleavage with a half-life greater than 500 min in brain, compared to 42 min for the standard peptide, DYN A(1-11)-NH2.
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