The presence of the mu-opioid receptor in the isthmus of mare oviduct.

Abstract:

:The presence of the mu-opioid receptor and the type of glycosylation in the third extra-cellular loop of this receptor was investigated in the isthmus of mare oviduct during oestrus by means of immunoblotting and immunohistochemistry combined with enzymatic (N-glycosidase F and O-glycosidase) and chemical (beta-elimination) treatments. Immunoblotting analysis showed that the mu-opioid receptor consists of two peptides with molecular weights of around 65 and 50 kDa. After N-deglycosylation with N-glycosidase F an additional immunoreactive peptide was observed at around 30 KDa. The cleavage of O-glycans by O-glycosidase failed in immunoblotting as well as in immunohistochemistry investigations, revealing that the third extra-cellular loop of the mu-opioid receptor expressed in mare isthmus oviduct contains some modifications of the Galbeta(1-3)GalNAc core binding to serine or threonine. Immunohistochemistry revealed the mu-opioid receptor in the mucosal epithelium, some stromal cells, muscle cells and blood vessels. In ciliated cells the mu-opioid receptor showed N-linked glycans, since the immunoreactivity was abolished after N-glycosidase F treatment, whereas it was preserved in the apical region after beta-elimination. Most non-ciliated cells expressed the mu-opioid receptor with both N- and O-linked oligosaccharides, as revealed by the abolition of immunostaining after N-glycosidase F and beta-elimination. Stromal cells, endothelial and muscle cells of blood vessels expressed the mu-opioid receptor containing both N- and O-linked oligosaccharides. Myosalpinx myocytes expressed the mu-opioid receptor with O-linked oligosaccharides. The immunopositive myocytes formed a circular coat in the intrinsic musculature, whereas they were arranged in some isolated, oblique bundles in the extrinsic musculature. In conclusion, the mu-opioid receptor could have a role in the production and the movement of isthmus lumen content that contributes to ensuring the effective condition of the sperm in the mare oviduct.

journal_name

Histol Histopathol

authors

Desantis S,Albrizio M,Ventriglia G,Deflorio M,Guaricci AC,Minoia R,De Metrio G

doi

10.14670/HH-23.555

subject

Has Abstract

pub_date

2008-05-01 00:00:00

pages

555-64

issue

5

eissn

0213-3911

issn

1699-5848

journal_volume

23

pub_type

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