On the role of histamine receptors in regulating pigmentary responses inOreochromis mossambicusmelanophores

Abstract

It is concluded that O. mossambicus melanophores have both H(1) and H(2) receptors which mediate melanophore aggregation and dispersion respectively. Compound 48/80 augmented the melanin-aggregating and dispersing effects of PEA and amthamine. It is suggested that the effect of histamine is directly mediated through H1 and H2 receptors, whereas H1Rs may be predominantly involved in the aggregatory responses.

Infection of endemic chub Squalius tenellus with the intestinal tapeworm Caryophyllaeus brachycollis (Cestoda): histopathology and ultrastructural surveys

“…MCs react to parasite exposure by releasing their contents through degranulation, a process that has been frequently documented in fish infected with metazoan parasites (Sayyaf Dezfuli et al ., 2021 a ). MC granules contain a panel of inflammation mediators including piscidins (Silphaduang et al ., 2006; Dezfuli et al ., 2010; Salger et al ., 2016), serotonin (Dezfuli et al ., 2000; Da Silva et al ., 2017), mucopolysaccharides with residues of α - N -acetyl-galactosamine (Dezfuli et al ., 2015) and finally, histamines (Mulero et al ., 2008; Salim et al ., 2012; Galindo-Villegas et al ., 2016; Sayyaf Dezfuli et al ., 2018). It is well known that, most parasitic helminths due to their attachment structures and/or penetration in host organ induce damages, and one of the functions of the MCs is tissue repair and remodelling (Dezfuli et al ., 2015).…”