Opioid peptides endomorphin-1 and endomorphin-2 in the immune system in humans and in a rodent model of inflammation

Title

Opioid peptides endomorphin-1 and endomorphin-2 in the immune system in humans and in a rodent model of inflammation

Creator

Jessop DS; Richards LJ; Harbuz MS

Publisher

Annals Of The New York Academy Of Sciences

Date

2002

Subject

Humans; Male; Animals; Rats; Non-U.S. Gov't; Research Support; Arthritis; Radioimmunoassay; Concanavalin A/pharmacology; Wistar; Spleen/chemistry; Thymus Gland/chemistry; Morphine/pharmacology; Apoptosis/drug effects; Experimental/immunology/metabolism; Lipopolysaccharides/pharmacology; Lymphocyte Activation/drug effects; Lymphocyte Subsets/chemistry/drug effects; Oligopeptides/analysis/pharmacology; Synovial Fluid/chemistry

Description

Endomorphin (EM)-1 and EM-2 are tetrapeptides with high affinity and selectivity for the micro-opioid receptor. We have utilized specific radioimmunoassays to characterize EM-1 and EM-2 in immune tissues from normal human subjects and from rats with adjuvant arthritis (AA). PBLs from three normal human subjects contained 248, 13, and 303 pg EM-1 per 100 million cells, whereas EM-2 was measured in two subjects at 69 and 588 pg per 100 million cells. In AA rats, EM-1 (but not EM-2) contents in the spleen and thymus were elevated compared with levels in tissues from non-AA controls. EM-1 was detectable in five of eight samples of synovial tissue from inflamed hind paws, whereas EM-2 was detectable in two of eight synovial extracts. Neither EM-1 nor EM-2 were detectable in synovial tissue from non-AA rats. To our knowledge, this is the first report of endomorphins in normal human immune cells. Increased endomorphin expression or uptake in peripheral tissues in a rodent model of chronic inflammation provides potential for endomorphins to selectively modulate chronic inflammation in mammals.
2002

Rights

Article information provided for research and reference use only. PedPalASCNET does not hold any rights over the resource listed here. All rights are retained by the journal listed under publisher and/or the creator(s).

Type

Journal Article

Citation List Month

Backlog

Pages

456-463

Volume

966

Citation

Jessop DS; Richards LJ; Harbuz MS, “Opioid peptides endomorphin-1 and endomorphin-2 in the immune system in humans and in a rodent model of inflammation,” Pediatric Palliative Care Library, accessed December 8, 2021, https://pedpalascnetlibrary.omeka.net/items/show/12771.

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