Enkephalin related peptides are released from jejum wall by orally ingested bromelain

Publication date: Available online 2 March 2019Source: PeptidesAuthor(s): Paulo Eduardo Orlandi-Mattos, Rodrigo Barbosa Aguiar, Itabajara da Silva Vaz Junior, Jane Zveiter Moraes, Elisaldo Luiz de Araujo Carlini, Maria Aparecida Juliano, Luiz JulianoAbstractStem bromelain [EC 3.4.22.32] is a thiol-endopeptidase and orally recommended in traditional medicine due to its analgesic activity, but the mechanisms are not known. Proenkephalin is expressed in the nervous system, but also in the gastrointestinal tract, where it can be assessed by ingested stem bromelain. Here we demonstrated that stem bromelain hydrolyses synthetic proenkephalin fragments after basic amino acid residues flanking the enkephalin sequences. We also observed with in vivo studies that oral administration of bromelain reduced jejunum proenkephalin levels and increased the serum enkephalin in mice. Effective anti-nociceptive effects in mice were observed 3 h after oral administration of 3 mg/kg stem bromelain by the acetic acid-induced writhing test. However, with higher doses this effect is reduced due to hydrolysis of enkephalin that possibly occurs by the presence of ananain in commercial pineapple stem bromelain preparations, that is also a thiol-protease with broad specificity. The analgesic effects were also evaluated by hot-plate and formalin tests and the obtained results indicated that enkephalin generated in intestine acts in periphery where it also can have anti-inflammatory activity.
Source: Peptides - Category: Biochemistry Source Type: research

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Source: Biocatalysis and Agricultural Biotechnology - Category: Biotechnology Source Type: research
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Source: Endocrine, Metabolic and Immune Disorders Drug Targets - Category: Drugs & Pharmacology Tags: Endocr Metab Immune Disord Drug Targets Source Type: research
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Source: Endocrine, Metabolic and Immune Disorders Drug Targets - Category: Drugs & Pharmacology Tags: Endocr Metab Immune Disord Drug Targets Source Type: research
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Source: Mol Biol Cell - Category: Molecular Biology Authors: Tags: Methods Mol Biol Source Type: research
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Source: Drug Development and Industrial Pharmacy - Category: Drugs & Pharmacology Tags: Drug Dev Ind Pharm Source Type: research
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Source: Drug Development and Industrial Pharmacy - Category: Drugs & Pharmacology Tags: Drug Dev Ind Pharm Source Type: research
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