Jean Silvain Lacroix

Learn More
Pharmacological and physiological aspects for neuropeptide Y (NPY) and noradrenaline (NA) cotransmission have been studied in the peripheral sympathetic nervous control of blood vessels, heart, spleen and vas deferens. NPY coexists with NA in large dense cored vesicles and is released compared to NA mainly upon high frequency stimulation or strong reflex(More)
Release of specific vasoactive peptides occurs upon activation of perivascular parasympathetic (vasoactive intestinal polypeptide and peptide histidine isoleucine), sympathetic (neuropeptide Y) and sensory (calcitonin gene-related peptide and tachykinins) nerves. These peptides may serve as cotransmitters with acetylcholine and noradrenaline with(More)
The aim of this study was to investigate the accuracy of self-reported ratings of olfactory function in 83 healthy subjects. Such ratings were compared with quantitative measures of olfactory function, as well as with ratings of nasal patency. In experiment 1 subjects rated olfactory function and nasal patency before olfactory testing, whereas in experiment(More)
The coexistence of neuropeptide Y (NPY) with noradrenaline (NA) in perivascular nerves as well as in sympathetic nerves to muscle in the heart, spleen and vas deferens suggests a role for NPY in autonomic transmission. Sympathetic nerve stimulation or reflexogenic activation in experimental animals or man are associated with NPY release as revealed by(More)
1. Co-existence of NA and NPY-LI was observed in the dense network of sympathetic nerves around both resistance and capacitance vessels in the nasal mucosa from most species including man. NPY-LI seems also to be present together with VIP-LI and PHI-LI in periglandular and some perivascular parasympathetic fibres in some species. 2. A new in vivo model was(More)
1. In pentobarbitone anaesthetized dogs, preganglionic stimulation of the superior cervical sympathetic nerve (15V, 1 ms, 10 Hz) induced marked reduction of nasal arterial blood flow, whereas parasympathetic nerve stimulation (5 V, 1 ms, 10-30 Hz) evoked frequency-dependent vasodilatation. 2. Sympathetic nerve stimulation for 3 min at 10 Hz evoked(More)
In dogs anaesthetized with pentobarbitone, we recorded bilateral vascular and secretory responses to unilateral stimulation of intranasal afferent nerves. Nasonasal reflexes evoked by intranasal light mechanical stimulation, intranasal application of cold saline (2 ml at 3 degrees C), capsaicin (0.003-0.3 mmol) and antidromic electrical stimulation (15 V,(More)
By means of immunohistochemistry and radioimmunoassay (RIA), we have investigated the possible occurrence of somatostatin (SOM)-like immunoreactivity (-LI) in the autonomic innervation of the pig nasal mucosa. SOM-immunoreactive (-IR) fibres were present around nasal arteries, arterioles and venous sinusoids. Double-labelling experiments revealed that(More)
1. In cats anaesthetized with pentobarbitone sodium (45 mg kg-1), electrical stimulation of the parasympathetic nerve fibres to the nasal mucosa evoked frequency-dependent increases in nasal arterial blood flow whereas stimulation of the superior cervical sympathetic nerve induced marked vasoconstriction. 2. Sympathetic nerve stimulation for 3 min at 10 Hz(More)
Many patients with olfactory dysfunction not only experience quantitative reduction of olfactory function, but also suffer from distorted olfactory sensations. This qualitative dysfunction is referred to as parosmia (also called "troposmia") or phantosmia, with the major difference that distorted olfactory sensations are experienced in the presence or(More)