Stefanov, I. S., A. P. Vodenicharov, N. S. Tsandev & G. N. Kostadinov, 2017.

Tyrosine hydroxylase positive nerves and mast cells in the porcine gallbladder.

Bulg. J. Vet. Med., 20, No 1, 1–10.

The aim of this study was to detect the localisation of tyrosine hydroxylase (TH) positive nerve fibres (THN) and distribution of tyrosine hydroxylase positive mast cells (THMC) in the wall of porcine gallbladder. THN were observed as single fibres, nerve fibres forming perivascular plexuses and nerve fibres grouped within the nerve fascicles. In the gallbladder`s fundus, body and neck, the TH<sup>+</sup> fibres formed mucosal, muscular and serosal nonganglionated nerve plexuses. Toluidine blue (TB) staining was used to confirm that the TH positive cells were mast cells. The number of THMC in the propria of gallbladder`s fundus, body and neck was significantly higher than in the muscular and serosal layers in both genders. The number of mast cells in the musculature was higher than in the serosa. The density and location of the THMC were similar to the TB positive (with gamma metachromasia) mast cells in both males and females, and statistically significant difference was not established. In conclusion, original data concerning the existence and localisation of catecholaminergic nerves and THMC distribution in the porcine gallbladder’s wall are presented. The results could contribute to the body of knowledge of functional communication between autonomic nerves and mast cells in the gallbladder.

Key words: autonomic nerves, gallbladder, mast cells, pig, tyrosine hydroxylase