Proenkephalin A-derived peptides in invertebrate innate immune processes.

Lipopolysaccharides (LPS) injection into the coelomic fluid of the leech Theromyzon tessulatum stimulates release of proenkephalin A (PEA)-derived peptides as determined by immunoprecipitation and Western blot analyses. This release occurs in the first 15 min after LPS exposure and yields a 5.3-kDa peptide fragment corresponding to the C-terminal part of the precursor. This fragment is then cleaved to free an antibacterial peptide related to mammals arginine phenylalanine extended enkelytin: the peptide B. These PEA processing peptides were characterized using a combination of techniques including reversed-phase HPLC, microsequencing and mass spectrometry. The isolated invertebrate peptide B presents a high sequence homology with the bovine's and the same activity against Gram+bacteria. Titrations revealed the simultaneous appearance of Methionine-enkephalin (ME) and peptide B in invertebrates after stimulation by LPS (in a dose-dependent manner), surgical trauma or electrical stimulations to neural tissues of the mussel. Furthermore, peptide B processing in vitro yields Methionine-enkephalin arginine phenylalanine (MERF), which exhibits via the delta receptors, immunocyte excitatory properties, i.e., movement and conformational changes, but no antibacterial activity. We surmise that this unified response to the various stimuli is a survival strategy for organism by providing immediate antibacterial activity and immunocyte stimulation, thereby reducing any immune latency period needed for an adequate immune response.

[The prevention of alcohol withdrawal syndrome (author's transl)]. / La prévention du syndrome de sevrage.

The study on the effect of the "tiapride" on the elements due to the withdrawal syndrome effected on thirty alcoholic patients allows us to draw the following results: failure, 13% studied cases; partial results, 50% very good results, 37%. The effect on the shivering was considered as good, but the effect on insomnia and anxiety was moderate. It appears that the doses which have been used are unsufficient to use this medecine as a "monotherapy". The authors intend to carry on this study using more important doses, taking into account the excellent tolerance observed.