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1. The macroscopic and single channel gating characteristics of connexin (Cx) 50 gap junction channels between pairs of N2A neuroblastoma cells transfected with mouse Cx50 DNA were investigated using the dual whole-cell voltage clamp technique. 2. The macroscopic junctional current (Ij) of Cx50-transfected cells decayed exponentially with time in response(More)
A strategy has been developed to identify and quantify the different neurochemical populations of myenteric neurons in the guinea-pig ileum using double-labelling fluorescence immunohistochemistry of whole-mount preparations. First, six histochemical markers were used to identify exclusive, non-overlapping populations of nerve cell bodies. They included(More)
1. Electrophysiological recordings were made from neurones in the submucous plexus of the guinea-pig small intestine, and these neurones were classified according to their synaptic inputs. 2. The neurones from which recording were made were filled during the recording period with the fluorescent dye, Lucifer Yellow, so they could be re-identified after(More)
Gastrointestinal motility involves interactions between myogenic and neurogenic processes intrinsic to the gut wall. We have compared the presence of propagating myogenic contractions of the isolated colon in four experimental animals (guinea pig, mouse, rabbit, and rat), following blockade of enteric neural activity. Isolated colonic preparations were(More)
A technique for performing correlated light and electron microscopic immunocytochemical studies on whole mount preparations has been developed using myenteric plexus from guinea pig small intestine as a model. With this method a structure containing a particular antigen can first be located by light microscopy and then examined with the electron microscope.(More)
A number of transient receptor potential (TRP) channels has recently been shown to mediate cutaneous thermosensitivity. Sensitivity to warm and cool stimuli has been demonstrated in both human and animal gastrointestinal tract; however, the molecular mechanisms that underlie this have not been determined. Vagal afferent neurons with cell bodies in the(More)
1. Peristalsis was evoked in guinea-pig small intestine by slow fluid infusion and recorded onto video and digitized. Spatio-temporal maps of diameter and longitudinal movement were constructed and parameters of motion were calculated. 2. During the filling of the isolated segments of intestine, rhythmic local longitudinal movements were observed at several(More)
Somatostatin and dopamine beta-hydroxylase have been localized in the coeliaco-mesenteric ganglia, in mesenteric nerves and in the wall of the guinea-pig small intestine. Nerve lesions were used to determine the sources of the nerves. Nerve cell bodies in the coeliaco-mesenteric ganglia with immunoreactivity for both somatostatin and dopamine(More)
Immunohistochemistry applied to whole-mount preparations was used to investigate the presence and distribution of vasoactive intestinal polypeptide (VIP) immunoreactive nerves in the non-retinal part of the human eye. The choroid has a dense perivascular supply of VIP immunoreactive nerve fibers, and some free nerve endings within the stroma. These nerves(More)