Urocanic acid suppresses the activation of human neutrophils in vitro.

Abstract:

:Exposure to ultraviolet (UV) light impairs the function of inflammatory cells. Urocanic acid (UCA) in an stratum corneum has been suggested as a mediator in the immunosuppression of lymphoid cells detected after irradiation with UVB (UV wavelengths 280-320 nm). In this study, we examined the effects of the two UCA isomers, trans and cis UCA on human polymorphonuclear leukocytes, neutrophils. It was found that treatment of cells with either trans of cis UCA isomers inhibited the opsonized zymosan-induced respiratory burst activity, measured with luminol-enhanced chemiluminescence assay. Both isomers were also able to partially block the up-regulation of complement receptors 1 (CR1; CD35) and 3 (CR3; CD11b/ CD18) in N-formyl-methionyl-leucyl-phenylalanine (FMLP)-stimulated neutrophils. These results indicate that the isomerization of trans UCA to cis UCA is not essential for the action of UCA on neutrophils. Neither of the UCA isomers were found to induce cyclic AMP (cAMP) formation in 3-isobutyl-1-methylxanthine treated cells, suggesting that the activation of adenylate cyclase cAMP system is not involved in UCA provoked suppression of neutrophils. It is concluded that the function of UCA may be protective, to suppress the activation of human neutrophils in inflamed, sunburned epidermis.

journal_name

Inflammation

journal_title

Inflammation

authors

Kivistö K,Punnonen K,Toppari J,Leino L

doi

10.1007/BF01487038

subject

Has Abstract

pub_date

1996-10-01 00:00:00

pages

451-9

issue

5

eissn

0360-3997

issn

1573-2576

journal_volume

20

pub_type

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