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The neocortex of cetartiodactyls. II. Neuronal morphology of the visual and motor cortices in the giraffe (Giraffa camelopardalis). Brain Struct Funct 2014; 220:2851-72. [PMID: 25048683 DOI: 10.1007/s00429-014-0830-9] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/11/2014] [Accepted: 06/21/2014] [Indexed: 12/24/2022]
Abstract
The present quantitative study extends our investigation of cetartiodactyls by exploring the neuronal morphology in the giraffe (Giraffa camelopardalis) neocortex. Here, we investigate giraffe primary visual and motor cortices from perfusion-fixed brains of three subadults stained with a modified rapid Golgi technique. Neurons (n = 244) were quantified on a computer-assisted microscopy system. Qualitatively, the giraffe neocortex contained an array of complex spiny neurons that included both "typical" pyramidal neuron morphology and "atypical" spiny neurons in terms of morphology and/or orientation. In general, the neocortex exhibited a vertical columnar organization of apical dendrites. Although there was no significant quantitative difference in dendritic complexity for pyramidal neurons between primary visual (n = 78) and motor cortices (n = 65), there was a significant difference in dendritic spine density (motor cortex > visual cortex). The morphology of aspiny neurons in giraffes appeared to be similar to that of other eutherian mammals. For cross-species comparison of neuron morphology, giraffe pyramidal neurons were compared to those quantified with the same methodology in African elephants and some cetaceans (e.g., bottlenose dolphin, minke whale, humpback whale). Across species, the giraffe (and cetaceans) exhibited less widely bifurcating apical dendrites compared to elephants. Quantitative dendritic measures revealed that the elephant and humpback whale had more extensive dendrites than giraffes, whereas the minke whale and bottlenose dolphin had less extensive dendritic arbors. Spine measures were highest in the giraffe, perhaps due to the high quality, perfusion fixation. The neuronal morphology in giraffe neocortex is thus generally consistent with what is known about other cetartiodactyls.
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Nicoletti M, Neri G, Maccauro G, Tripodi D, Varvara G, Saggini A, Potalivo G, Castellani M, Fulcheri M, Rosati M, Toniato E, Caraffa A, Antinolfi P, Cerulli G, Pandolfi F, Galzio R, Conti P, Theoharides T. Impact and Neuropeptide Substance Pan Inflammatory Compound on Arachidonic Acid Compound Generation. Int J Immunopathol Pharmacol 2012; 25:849-57. [DOI: 10.1177/039463201202500403] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
Abstract
There is much evidence that neuropeptide substance P is involved in neurogenic inflammation and is an important neurotransmitter and neurmodulator compound. In addition, substance P plays an important role in inflammation and immunity. Macrophages can be activated by substance P which provokes the release of inflammatory compounds such as interleukins, chemokines and growth factors. Substance P is involved in the mechanism of pain through the trigeminal nerve which runs through the head, temporal and sinus cavity. Substance P also activates mast cells to release inflammatory mediators such as arachindonic acid compound, cytokines/chemokines and histamine. The release of these chemical mediators is crucial for inflammatory response. Among these mediators there are prostoglandins and leukotrines. Here we review the impact of substance P on inflammatory compounds.
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Affiliation(s)
- M. Nicoletti
- Department of Neurosciences and Imaging, University of Chieti, Italy
| | - G. Neri
- ENT Division, University of Chieti, Italy
| | - G. Maccauro
- Orthopedics Division, Catholic University of Rome, Rome, Italy
| | - D. Tripodi
- Dental School, University of Chieti-Pescara, Italy
| | - G. Varvara
- Dental School, University of Chieti-Pescara, Italy
| | - A. Saggini
- Dermatology Department, University Tor Vergata, Rome, Italy
| | - G. Potalivo
- Orthopedics Division, University of Perugia, Perugia, Italy
| | | | - M. Fulcheri
- Department of Psychology, University of Chieti-Pescara, Italy
| | - M. Rosati
- Gynecology Division, Santo Spirito Hospital, Pescara, Italy
| | - E. Toniato
- Immunology Division, University of Chieti-Pescara, Italy
| | - A. Caraffa
- Orthopedics Division, University of Perugia, Perugia, Italy
| | - P. Antinolfi
- Orthopedics Division, University of Perugia, Perugia, Italy
| | - G. Cerulli
- Orthopedics Division, University of Perugia, Perugia, Italy
| | - F. Pandolfi
- Department of Medicine, Catholic University of Rome, Rome, Italy
| | - R. Galzio
- Department of Neurosurgery, University of L'Aquila, Italy
| | - P. Conti
- Immunology Division, University of Chieti-Pescara, Italy
| | - T.C. Theoharides
- Department of Physiology and Pharmacology, Tufts University School of Medicine, New England Medical Center, Boston, MA, USA
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3
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Galarraga E, Hernández-López S, Tapia D, Reyes A, Bargas J. Action of substance P (neurokinin-1) receptor activation on rat neostriatal projection neurons. Synapse 1999; 33:26-35. [PMID: 10380848 DOI: 10.1002/(sici)1098-2396(199907)33:1<26::aid-syn3>3.0.co;2-4] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
Substance P (SP) acts as a neurotransmitter in the neostriatum through the axon collaterals of spiny projection neurons. However, possible direct or indirect actions of SP on the neostriatal output neurons have not been described. Targets of SP terminals within the neostriatum include interneurons, spiny neurons, afferent fibers and boutons. SP induces the release of both dopamine (DA) and acetylcholine (ACh). Since some postsynaptic actions of both DA and ACh on spiny neurons are known, we asked if activation of neostriatal NK1-class receptors is able to reproduce them. The SP NK1-receptor agonist, GR73632 (1 microM), had both excitatory and inhibitory actions on virtually all spiny neurons tested at resting potential. The excitatory action was blocked by atropine and coursed with an increase in firing rate and input resistance (R(N)). The inhibitory action was blocked by haloperidol and coursed with a reduction in firing rate and R(N). Therefore, the release of both DA and ACh induced by NK1-receptor activation modulates indirectly the excitability of the projection neurons. SP facilitates the actions of these transmitters on the spiny neuron. A residual excitatory response to the NK1-receptor agonist was observed in 30% of a sample of neurons tested in the presence of both haloperidol and atropine. The increase in R(N) that accompanied this response could be observed in the presence of 1 microM TTX or 100 microM Cd2+, suggesting a direct effect. Double labeling showed that only SP-immunoreactive neurons were facilitated by NK1-receptor activation in these conditions.
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Affiliation(s)
- E Galarraga
- Departamento de Biofísica, Instituto de Fisiología Celular, UNAM, México City DF, México.
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Liu H, Mazarati AM, Katsumori H, Sankar R, Wasterlain CG. Substance P is expressed in hippocampal principal neurons during status epilepticus and plays a critical role in the maintenance of status epilepticus. Proc Natl Acad Sci U S A 1999; 96:5286-91. [PMID: 10220458 PMCID: PMC21856 DOI: 10.1073/pnas.96.9.5286] [Citation(s) in RCA: 96] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
Substance P (SP), a member of the tachykinin family, is widely distributed in the central nervous system and is involved in a variety of physiological processes including cardiovascular function, inflammatory responses, and nociception. We show here that intrahippocampal administration of SP triggers self-sustaining status epilepticus (SSSE) in response to stimulation of the perforant path for periods too brief to have any effect in control rats, and this SSSE generates a pattern of acute hippocampal damage resembling that known to occur in human epilepsy. The SP receptor (SPR) antagonists, spantide II and RP-67,580, block both the initiation of SSSE and SSSE-induced hippocampal damage and terminate established anticonvulsant-resistant SSSE. SSSE results in a rapid and dramatic increase in the expression of preprotachykinin A (a precursor of SP) mRNA and SP in principal neurons in CA3, CA1, and the dentate gyrus as well as in hippocampal mossy fibers. SP also increases glutamate release from hippocampal slices. Enhanced expression of SP during SSSE may modulate hippocampal excitability and contribute to the maintenance of SSSE. Thus, SPR antagonists may constitute a novel category of drugs in antiepileptic therapy.
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Affiliation(s)
- H Liu
- Epilepsy Research Laboratory, Veteran Administration Medical Center, Sepulveda, CA 91343, USA.
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5
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Maubach KA, Cody C, Jones RS. Tachykinins may modify spontaneous epileptiform activity in the rat entorhinal cortex in vitro by activating GABAergic inhibition. Neuroscience 1998; 83:1047-62. [PMID: 9502245 DOI: 10.1016/s0306-4522(97)00469-7] [Citation(s) in RCA: 23] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
The effects of substance P and related tachykinins on intrinsic membrane properties and synaptic responses of neurons in cortical slices were determined. Substance P had no detectable effect on membrane properties of principal neurons in layer II or V of the rat medial entorhinal cortex or on neurons in either layer of the anterior cingulate cortex. Specific agonists at the neurokinin1-receptor were also without effect as were agonists at both neurokinin1- and neurokinin3-receptors. Substance P hyperpolarized a small number of principal neurons. These responses were weak and desensitized with repeated applications. Similar effects were seen with other neurokinin1-receptor agonists. Excitatory synaptic potentials mediated by either alpha-amino-3-hydroxy-5-methyl-4-isoxazolepropionate- or N-methyl-D-aspartate-receptors in principal neurons of the entorhinal cortex were unaffected by substance P. Responses of entorhinal neurons to iontophoretically applied glutamate and N-methyl-D-aspartate were also unaffected. Inhibitory synaptic potentials mediated by either GABA(A)- or GABA(B)-receptors in entorhinal neurons were slightly but consistently enhanced by substance P. Neurons identified as interneurons on the basis of their firing characteristics were consistently depolarized by substance P. These responses also desensitized with repeated applications. Spontaneous epileptiform discharges evoked in entorhinal cortex by perfusion with a GABA(A)-receptor antagonist (bicuculline), were reduced in frequency and, sometimes, in duration by substance P. This effect was mimicked by other neurokinin1-receptor agonists and blocked by neurokinin1-receptor antagonists. It was also mimicked by neurokinin A but not by a specific neurokinin1-receptor agonist. The reduction in frequency of discharges was also mimicked by a GABA(B)-receptor agonist, L-baclofen, and blocked by the GABA(B)-receptor antagonist, CGP55845A. Neurokinin B, and a specific neurokinin1-receptor agonist (senktide), increased the frequency and (sometimes) duration of epileptiform discharges. Substance P could also increase frequency but this usually succeeded or preceded a decrease in frequency. The effect of neurokinin B was reduced by a metabotropic glutamate receptor antagonist. Substance P appears to have little direct effect on principal neurons of the entorhinal cortex but may hyperpolarize them indirectly by activating interneurons and releasing GABA. This indirect inhibition may be responsible for the ability of substance P to reduce the frequency of epileptiform discharges in the entorhinal cortex and may suggest that neurokinin1-receptor agonists have potential as anticonvulsant drugs.
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Affiliation(s)
- K A Maubach
- Department of Physiology, School of Medical Sciences, University of Bristol, UK
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Barbaresi P, Gazzanelli G, Malatesta M. Glutamate-positive neurons and terminals in the cat periaqueductal gray matter (PAG): a light and electron microscopic immunocytochemical study. J Comp Neurol 1997; 383:381-96. [PMID: 9205048 DOI: 10.1002/(sici)1096-9861(19970707)383:3<381::aid-cne8>3.0.co;2-#] [Citation(s) in RCA: 23] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Abstract
The morphology, distribution, proportion, size, and synaptic organization of periaqueductal gray matter neurons labeled with immunocytochemical techniques by an anti-glutamate (Glu) polyclonal serum were investigated in six adult cats (PAG-GLU 1-6). At the light microscopic level, numerous Glu-positive neurons were found throughout each subdivision of the periaqueductal gray matter. Their proportion and size, calculated in semi-thin sections (1-microm-thick), varied slightly among the subdivisions of the periaqueductal gray matter. The morphology of Glu-positive neurons was similar to that of the multipolar, triangular, and fusiform cells described in previous Golgi studies. Numerous puncta, interpreted as dendrites, axons, and axon terminals were also present in all subdivisions without preferential distribution. At the electron microscopic level, all synaptic contacts made by Glu-positive axon terminals were of the asymmetric type, but not all presynaptic elements making asymmetric synapses were labeled. The vast majority of postsynaptic elements contacted by Glu-positive axon terminals were labeled and unlabeled dendrites. The present results describe for the first time the presence of both Glu-positive neurons and terminals in the feline periaqueductal gray matter and provide further evidence that Glu is the probable neurotransmitter of numerous excitatory neurons of this structure.
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Affiliation(s)
- P Barbaresi
- Institute of Human Physiology, University of Ancona, Italy.
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7
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Ansel JC, Kaynard AH, Armstrong CA, Olerud J, Bunnett N, Payan D. Skin-nervous system interactions. J Invest Dermatol 1996; 106:198-204. [PMID: 8592075 DOI: 10.1111/1523-1747.ep12330326] [Citation(s) in RCA: 151] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
Affiliation(s)
- J C Ansel
- Department of Dermatology, Emory University School of Medicine, Atlanta, GA 30322, USA
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8
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Kaneko T, Shigemoto R, Nakanishi S, Mizuno N. Morphological and chemical characteristics of substance P receptor-immunoreactive neurons in the rat neocortex. Neuroscience 1994; 60:199-211. [PMID: 8052413 DOI: 10.1016/0306-4522(94)90215-1] [Citation(s) in RCA: 38] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Abstract
Substance P receptor-expressing neurons in the rat cerebral neocortex were examined by single- and double-immunolabeling methods with an affinity-purified specific antibody to substance P receptor. Substance P receptor immunoreactivity was observed exclusively in non-pyramidal neurons. About a quarter of these substance P receptor-positive neocortical neurons showed intense immunoreactivity, and the other three quarters displayed weak substance P receptor immunoreactivity. The neurons showing intense substance P receptor immunoreactivity were large multipolar cells with a few long aspiny or sparsely-spiny dendrites, and were scattered throughout the neocortical layers except for layer I, and also in the underlying white matter. The weakly immunoreactive neurons were medium-sized multipolar cells with oval to round somata and aspiny varicose dendrites, and were distributed in all cortical layers with a bias to layers II-III and the superficial part of layer V. The double-immunofluorescence study revealed that almost all substance P receptor-positive neurons were immunoreactive for GABA, but negative for glutaminase. Substance P receptor immunoreactivity in GABAergic neocortical neurons were further examined by the double-immunofluorescence method with antibodies to markers for subgroups of GABAergic neurons. Somatostatin immunoreactivity was found in 89% of neurons with intense substance P receptor immunoreactivity, and in 1.5% of neurons with weak substance P receptor immunoreactivity. Neuropeptide Y immunoreactivity was also observed in 92% of neurons with intense immunoreactivity for substance P receptor, and in 1.6% of neurons with weak immunoreactivity for substance P receptor. In contrast, parvalbumin immunoreactivity was seen in 1.3% of neurons with intense substance P receptor immunoreactivity, and in 59% of weak substance P receptor immunoreactivity. Calbindin D28k immunoreactivity was found in 12 and 19% of neurons, respectively, with weak and intense immunoreactivities for substance P receptor. Virtually no cells showing substance P receptor immunoreactivity displayed immunoreactivity for vasoactive intestinal polypeptide or choline acetyltransferase. These results indicate that the neocortical neurons expressing substance P receptor constitute a subpopulation of GABAergic non-pyramidal cells, and are segregated into neurons with intense immunoreactivity and those with weak immunoreactivity for substance P receptor; the vast majority of neurons with intense substance P receptor immunoreactivity contain somatostatin and neuropeptide Y, and the majority of neurons with weak substance P receptor immunoreactivity have parvalbumin.
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Affiliation(s)
- T Kaneko
- Department of Morphological Brain Science, Faculty of Medicine, Kyoto University, Japan
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9
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Abstract
The localization of tachykinin-immunoreactivity in the cat visual cortex (area 17) was investigated using immunohistochemical methods. Strong laminar specificity was observed, with immunoreactivity highest in layer V, followed by layers I, VI, II and III, and the lowest density in layer IV. Most of the immunoreactive product was localized in neuronal processes. A few immunopositive cell bodies were also present. The immunopositive neurons were non-pyramidal, multipolar, or bipolar in shape, and mostly found in layer V. There were particularly dense immunopositive fibers and varicosities around somata in layer V. These may represent tachykinin-containing presynaptic terminals (boutons). The results provide anatomical evidence that tachykinins may primarily affect layer V neurons in the cat visual cortex.
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Affiliation(s)
- Q Gu
- Department of Ophthalmology, University of British Columbia, Vancouver, Canada
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10
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Abstract
Because of the enormous growth over the last three decades of research on the role of peptides in the brain, the need became apparent to determine the status of these compounds in terms of their current research interest. Since 1965, over a quarter of a million research papers have been published on peptides that have since been classified as neuroactive. The present study was undertaken to analyze systematically the yearly trends of research emphasis in neuroactive peptides as reflected by their individual frequency of publication by year, beginning in 1966. A computer analysis of the publication characteristics was carried out using the Medline data base in which the citation search was limited to the topic brain crossed with the topic mammal. One criterion for the inclusion of a given peptide in the analysis was a frequency of 25 or more citations following its discovery, as related to the mammalian brain. The 42 peptides that met this criterion were: adrenocorticotropic hormone, angiotensin II, atrial natriuretic factor, bombesin, bradykinin, calcitonin, calcitonin gene-related peptide, carnosine, beta-casomorphin, cholecystokinin, corticotropin-releasing factor, delta sleep-inducing peptide, dynorphin, beta-endorphin, Leu-enkephalin, Met-enkephalin, galanin, gastrin, glucagon, growth hormone, growth hormone-releasing factor, insulin, kyotorphin, beta-lipotropin, luteinizing hormone-releasing factor, melanocyte-stimulating hormone release inhibitory factor-1, alpha-melanocyte-stimulating hormone, motilin, neurokinin A, neurokinin B, neuropeptide Y, neurotensin, oxytocin, pituitary adenylate cyclase activating polypeptide, peptide HI, prolactin, secretin, somatostatin, substance P, thyroid-releasing hormone, vasopressin, and vasoactive intestinal peptide. An overall analysis of the 298,105 papers published on these 42 peptides since 1965 revealed that the research activity of 24,742, or 8.30%, of the studies, focused on their neuroactive properties. Taken as a whole, the research on neuroactive peptides reached a peak in 1986, as reflected by the total of 1793 papers published during that year. Although the level of publication has fluctuated between 1548 and 1774 research papers over the last 6 years, it is now clear that the trend in research on neuroactive peptides has reached an asymptote today that shows no sign of deviation. A temporal analysis year by year of individual publication profiles revealed three distinct trends: 1) peptides showed a slow development in research interest and did not exceed more than 15-30 publications per year; 2) peptides exhibited a steady increase in research activity over the years that continues today; and 3) peptides displayed an initial, often intense, research emphasis that inexplicably declined, in some cases precipitously, in the mid 1980s.(ABSTRACT TRUNCATED AT 400 WORDS)
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Affiliation(s)
- R D Myers
- Department of Pharmacology, School of Medicine, East Carolina University, Greenville, NC 27858
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Tominaga S, Saito N, Tsujino T, Tanaka C. Immunocytochemical localization of alpha-, beta I-, beta II- and gamma-subspecies of protein kinase C in the motor and premotor cortices of the rhesus monkey. Neurosci Res 1993; 16:275-86. [PMID: 8394555 DOI: 10.1016/0168-0102(93)90038-r] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2023]
Abstract
We obtained evidence for the localization of alpha-, beta I-, beta II- and gamma-subspecies of protein kinase C (PKC) in the monkey motor and premotor cortices (Brodmann's areas 4 and 6). In Brodmann's area 4, the immunoreactivity for the alpha-PKC was present in horizontal and round cells in the layers I and II, and small pyramidal cells in layer III and also in the glial cells in subcortical white matter. The alpha-PKC immunopositive glial cells contained GFAP-immunoreactive product. The beta I-PKC immunoreactivity was present in the round cells in layer I and in the pyramidal cells in the layer V, including Betz cells. The beta II-PKC immunoreactivity was observed as small dots in perikarya of the small and medium-sized pyramidal cells in layers II, III, V and VI, but not in layer I. The gamma-PKC immunoreactive cell bodies were observed in layers II, III and VI, and most of the immunoreactive cells were pyramidal. Intense gamma-PKC immunoreactivity was found in the neuropils of layers I and II. Similar distributions of four PKC subspecies were seen in Brodmann's area 6, except that beta I-PKC immunoreactive Betz cells were not present. The unique localization of PKC subspecies suggested that each PKC subspecies was involved in the specific function in motor and premotor cortices of the rhesus monkey.
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Affiliation(s)
- S Tominaga
- Department of Pharmacology, Kobe University School of Medicine, Japan
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Mehra RD, Hendrickson AE. A comparison of the development of neuropeptide and MAP2 immunocytochemical labeling in the macaque visual cortex during pre- and postnatal development. JOURNAL OF NEUROBIOLOGY 1993; 24:101-24. [PMID: 7678282 DOI: 10.1002/neu.480240109] [Citation(s) in RCA: 20] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
Abstract
The appearance of Substance P (SP) and Neuropeptide Y (NPY) has been studied using light microscopic immunocytochemical labeling throughout the complete developmental span of Macaca nemestrina monkey striate cortex. In the adult, 80% of the NPY+ neurons occur in the white matter (WM) and most of the remainder are medium to large multipolar neurons in layer 2. Fibers occur in all layers except 4C and are very numerous, given the relatively small number of NPY+ cell bodies. NPY+ neurons first were seen at embryonic day (E) 75. Most neurons were in the intermediate zone (IZ), but a few were in the immature cortical plate (CP). An adult-like distribution was present by E125 for neurons and by birth for fibers, but fiber staining intensity and number increased to postnatal year 1 (P1yr). In adult cortex, numerous SP+ nonpyramidal neurons were present in layers 2-6 and WM, but SP+ fibers were surprisingly infrequent. During development, significant numbers of SP+ neurons were not seen in the CP until E113-125. Later prenatal ages had a prominent plexus of SP+ cell bodies and fibers at the layer 5/6 border. This plexus disappeared by P12wk due to either down-regulation of SP or cell death. SP+ neurons in IZ/WM were very sparse until birth after which they increased in number and staining intensity up to P1yr, suggesting a postnatal up-regulation of SP in a preexisting WM subpopulation. Cell densities were determined for SP, NPY, and the neuron-specific marker microtubule-associated protein 2 (MAP2) to clarify the developmental dynamics of IZ/WM neurons. MAP2+ cell densities in WM peaked around birth and then declined 20% in the outer half and 77% in the inner half of WM. SP+ cell density rose 57% from birth to P20wk and then declined 20% into adulthood. NPY+ cell density was fairly constant prenatally and then rose 300% by adulthood. Neuropeptide cell density changes took place predominantly in the outer WM. These data indicate that cell death does occur in the general population of monkey striate cortical WM neurons. In contrast, both SP+ and NPY+ cells are characterized by minimal cell death and a late expression of neuropeptides which causes an increase in neuropeptide+ cell density in postnatal WM.
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Affiliation(s)
- R D Mehra
- Department of Anatomy, All India Institute of Medical Sciences, New Delhi
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13
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Affiliation(s)
- M Hayashi
- Department of Physiology, Primate Research Institute of Kyoto University, Aichi, Japan
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14
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Hutsler JJ, Chalupa LM. Substance P immunoreactivity identifies a projection from the cat's superior colliculus to the principal tectorecipient zone of the lateral posterior nucleus. J Comp Neurol 1991; 312:379-90. [PMID: 1721076 DOI: 10.1002/cne.903120306] [Citation(s) in RCA: 28] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
Cells in the superficial layers of the superior colliculus innervate multiple visual regions within the pulvinar-lateral posterior complex of the cat. To characterize these neurons we have examined their immunocytochemical properties in conjunction with their projection patterns. In the present study, we show that a monoclonal antibody for substance P recognizes a morphologically diverse population of neurons, which can be classified as granular, stellate, angular, and horizontal or nonhorizontal fusiform cell types. These neurons are distributed throughout the superficial layers of the colliculus, with a peak density corresponding to sublayer 2 of the stratum griseum superficiale. Injections of rhodamine latex micropheres into the pulvinar-lateral posterior complex demonstrate that a substantial proportion of these collicular cells (at least 35%) project to this region of the posterior thalamus. The overall population of substance P-containing cells, as well as the immunoreactive projection neurons, is composed of the same proportions of cell classes, with the exception that granular cells were not found to be projection neurons. A distinct wedge of substance P immunoreactivity, consisting of fiber and diffuse extracellular labeling, was discovered in the pulvinar-lateral posterior complex. This staining was demonstrated to be confined entirely within the medial division of the lateral posterior nucleus, which is considered to be the principal tectorecipient zone of the extrageniculate visual thalamus. Lesions of the superior colliculus largely abolished the substance P immunoreactivity in the ipsilateral tectorecipient zone. These results are consistent with the view that substance P plays a role in the functional organization of the principal tectothalamic pathway of the cat's extrageniculate visual system.
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Affiliation(s)
- J J Hutsler
- Department of Psychology, University of California, Davis 95616
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15
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Yamashita A, Shimizu K, Hayashi M. Ontogeny of substance P-immunoreactive structures in the primate cerebral neocortex. BRAIN RESEARCH. DEVELOPMENTAL BRAIN RESEARCH 1990; 57:197-207. [PMID: 1705868 DOI: 10.1016/0165-3806(90)90046-2] [Citation(s) in RCA: 22] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
The distribution and the ontogeny of substance P (SP)-immunoreactive structures were investigated in the various cortical areas of macaque monkey cerebrum at embryonic day 120 (E120), embryonic day 140 (E140), newborn (Nb), postnatal day 30, postnatal day 60 (P60) and adult stages, using an immunohistochemical method. SP-immunoreactive cell bodies and fibers were detectable at E120 and the cell number increased until Nb stage. At E140, many immunoreactive cells were present in the upper part of layer V. Some of them seemed to be developing pyramidal cells which ascended their fibers toward layer I. After Nb stage, the number of immunoreactive structures decreased. By P60, the distribution patterns of SP-immunoreactive structures reached the adult level. Between Nb and P60, we occasionally observed structures which were presumably degenerated neurons and fibers. The distribution and developmental ontogeny of immunoreactivities were different among the various cortical areas. In areas OC and FA (von Bonin and Bailey), we observed the high densities of immunoreactive fibers and terminals, in spite of low numbers of cell somatas. While, in the association areas (areas FD, PE, TA and TE), there existed larger numbers of immunoreactive cells at E140 and newborn stages, following the decrease of cell number until P60. Our present study shows the transient increase and the following decrease of the numbers of SP-immunoreactive cells. Since we observed SP-immunoreactive pyramidal cells and degenerating cells during development, the decrease of immunoreactivities may be due to both cell death and change in phenotype.
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Affiliation(s)
- A Yamashita
- Department of Physiology, Kyoto University, Aichi, Japan
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16
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Gioia M, Bianchi R. Ultrastructure of substance P immunoreactive elements in the periaqueductal gray matter of the rat. Anat Rec (Hoboken) 1990; 228:345-57. [PMID: 1701983 DOI: 10.1002/ar.1092280314] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
Substance P (SP) is a non-opioid peptide that generates a potent analgesia when injected into the periaqueductal gray matter (PAG). The aim of this study was to investigate the fine neuronal structures and synaptic circuits involved in SP action in rats by means of electron microscopy, using immunocytochemical (ICC) pre-embedding methods. A conventional ultrastructural study, carried out to interpret the ICC data correctly, shows small sized nerve cell bodies with a high nucleus-cytoplasmic ratio; absence of an extensive granular endoplasmic reticulum; and few axo-somatic contacts having symmetrical and asymmetrical junctions in equal proportions. The large neuropil is characterized by numerous thin unmyelinated axons and axo-dendritic synapses mainly showing pleomorphic vesicles and asymmetrical junctions. The ICC analysis showed moderately labeled nerve cell bodies with the same structural, synaptic, and dimensional features as the negative cells. In the neuropil SP immunoreactivity is shown by dendrites, synapses, and thin elements which are unidentifiable structurally. No SP terminals synapsing on SP nerve cell bodies were found and only occasional SP light labeled terminals synapsing on negative perikarya were seen. The SP boutons generally have pleomorphic vesicles and asymmetrical junctions. On the basis of these data a possible excitatory activity of PAG SP synapses could be hypothesized. This activity would take place on postsynaptic neurons generally at a dendritic level. Our ultrastructural findings give support to an excitatory role carried out by SP neurons of the PAG, as suggested by the role of PAG circuitry on spinal nociception.
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Affiliation(s)
- M Gioia
- Institute of Human Anatomy, University of Milan, Italy
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Affiliation(s)
- D G Payan
- Howard Hughes Medical Institute, San Francisco, California
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Sugiya H, Tennes KA, Putney JW. Homologous desensitization of substance-P-induced inositol polyphosphate formation in rat parotid acinar cells. Biochem J 1987; 244:647-53. [PMID: 2451500 PMCID: PMC1148045 DOI: 10.1042/bj2440647] [Citation(s) in RCA: 70] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
Maximal concentrations of substance P and methacholine induced a rapid increase in [3H]inositol trisphosphate ([3H]IP3) formation. After about 1 min, the [3H]IP3 in the substance-P-treated cells ceased to increase further, whereas in the methacholine-treated cells [3H]IP3 continued to increase. Addition of methacholine to the substance-P-treated cells caused a rapid increase in [3H]IP3, whereas a second addition of a 10-fold excess of substance P had no effect. Pretreatment of cells with substance P, followed by removal of the substance P by washing, resulted in a decreased response to a second application of substance P. A similar protocol involving pretreatment with methacholine had no effect on subsequent responsiveness to substance P. Analysis of [3H]substance P binding to substance-P-treated cells indicated that the number of receptors for substance P was decreased, but the affinity of the receptors for substance P was unaffected. After substance P pretreatment, a prolonged incubation (2 h) restored responsiveness of the cells to substance P, measured as [3H]IP3 formation, and restored the number of binding sites to control values. These findings indicate that, in the rat parotid gland, substance P induces a homologous desensitization of its receptor, which involves a slowly reversible down-regulation or sequestration of substance-P-binding sites.
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Affiliation(s)
- H Sugiya
- Division of Cellular Pharmacology, Medical College of Virginia, VCU, Richmond 23298
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Pongdhana K, Ogawa N, Hirose Y, Ono T, Kosaka F, Mori A. Effects of ketamine on the cholecystokinin, somatostatin, substance P, and thyrotropin releasing hormone in discrete regions of rat brain. Neurochem Res 1987; 12:73-7. [PMID: 2437471 DOI: 10.1007/bf00971367] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
Intraperitoneal injection of ketamine (100 mg/kg body weight) significantly reduces the levels of cholecystokinin (CCK), somatostatin (SRIF), and substance P (SP)-like immunoreactivity in various regions of rat brain. No significant change in thyrotropin releasing hormone (TRH)-like immunoreactivity was observed. Neuropeptide systems may be involved in the neuropharmacologic effects of ketamine.
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Siggins GR, Gruol DL. Mechanisms of Transmitter Action in the Vertebrate Central Nervous System. Compr Physiol 1986. [DOI: 10.1002/cphy.cp010401] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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Jones RS, Olpe HR. Pharmacological characterization of the receptor mediating the adrenergic inhibition of responses to substance P in the cingulate cortex. Brain Res 1986; 367:151-61. [PMID: 2421829 DOI: 10.1016/0006-8993(86)91588-x] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
The excitatory responses of neurones in the anterior cingulate cortex of the rat to iontophoretically applied substance P (SP) are reduced by noradrenaline (NA) applied iontophoretically or released from noradrenergic pathways. In order to determine the receptor involved in this inhibitory effect we have studied the effects of a number of receptor-specific adrenergic agonists and antagonists on responses of cingulate neurones to SP in rats anaesthetized with chloral hydrate. Low iontophoretic currents (0-15 nA) of NA, adrenaline and the beta-agonist, clenbuterol, all strongly reduced responses to SP. Isoprenaline was also effective but less consistently so, although problems were experienced with its iontophoretic release from micropipettes. The alpha 1-agonists, phenylephrine and methoxamine were also able to reduce responses to SP. However, this reduction required higher iontophoretic currents (15-60 nA) and was associated with depressant effects on baseline firing rate. The alpha 2-agonist clonidine was only weakly active at high currents and this too was associated with depression of baseline firing. Similar weak effects were noted with dopamine. The inhibitory effects of NA on SP responses were convincingly blocked or reversed by the beta-antagonist, practolol, but not by the alpha 1-antagonist, prazosin. The reduction of SP responses by phenylephrine was also blocked by practolol but unaffected by prazosin. Finally, reduction of SP excitations by activation of the coeruleocortical pathway was also blocked by practolol applied iontophoretically to the cortical cells. These results are consistent with the hypothesis that the effect of NA on SP responsiveness in the cingulate cortex is mediated by beta-adrenoreceptors.
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Hayashi M, Oshima K. Neuropeptides in cerebral cortex of macaque monkey (Macaca fuscata fuscata): regional distribution and ontogeny. Brain Res 1986; 364:360-8. [PMID: 2418918 DOI: 10.1016/0006-8993(86)90848-6] [Citation(s) in RCA: 50] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
The concentrations of vasoactive intestinal polypeptide, somatostatin and substance P were determined in various cerebral subdivisions of adult and foetal Japanese monkeys (Macaca fuscata fuscata) by specific radioimmunoassays. In adult tissues, the highest level of vasoactive intestinal polypeptide was found in the somatosensory cortex and the lowest level in the occipital cortex. A high level of somatostatin was found in the association cortex (prefrontal, parietal and temporal cortex); the lowest level was noted in the occipital cortex. Substance P was found to be high in prefrontal and temporal cortex. The highest levels of substance P and somatostatin were obtained in the amygdala. Between embryonic 4 and 5.5 months, concentrations of peptides increased dramatically, and in the adult, all neuropeptides in cortical subdivisions significantly decreased. By the gel filtration method, only one immunoreactivity which coeluted with substance P and vasoactive intestinal polypeptide was demonstrated in extracts of 4-, 5.5-month-old and adult monkey cerebral cortex. In contrast, somatostatin immunoreactivity eluted as 3 peaks. Almost 80% of the immunoreactivity co-eluted with synthetic somatostatin, regardless of the age of the tissue. The molecular weights of two larger molecules were determined to be 13 and 3 kdaltons.
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Wolf SS, Moody TW, Quirion R, O'Donohue TL. Biochemical characterization and autoradiographic localization of central substance P receptors using [125I]physalaemin. Brain Res 1985; 332:299-307. [PMID: 2581653 DOI: 10.1016/0006-8993(85)90598-0] [Citation(s) in RCA: 49] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
The binding of [125I]physalaemin to rat brain slices was investigated. Radiolabeled physalaemin bound with high affinity (Kd = 0.3 nM) to a single class of sites (Bmax = 22 fmol/mg protein). Kinetic studies indicated that binding was time-dependent and all specific binding was reversible. Pharmacology studies indicated that specific [125I]physalaemin binding was inhibited by structurally related peptides such as substance P and eledoisin. Biochemical studies indicated that specific binding of radiolabeled physalaemin was greatly reduced if the brain slices were pretreated with heat, trypsin or N-ethyl maleimide. Autoradiographic studies indicated that the [125I]physalaemin binding sites were discretely distributed throughout the brain. Highest grain densities were present in the olfactory bulb, dentate gyrus, amygdala, superficial layers of the superior colliculus, subiculum, dorsal parabrachial nucleus, locus coeruleus, nucleus tractus solitarii and dorsal horn of the spinal cord. Moderate grain densities were present in the nucleus accumbens, olfactory tubercle, pyriform cortex, striatum, hippocampus, inferior colliculus and central gray of the midbrain. Low grain densities were present in most thalamic nuclei, the substantia nigra and cerebellum. The corpus callosum and controls treated with 1 microM unlabeled physalaemin had negligible levels of binding. The unique pharmacological and regional distribution data obtained suggest that [125I]physalaemin may serve as a valuable probe to study central substance P receptors.
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Sakamoto N, Takatsuji K, Shiosaka S, Tohyama M. Evidence for the existence of substance P-like immunoreactive neurons in the human cerebral cortex: an immunohistochemical analysis. Brain Res 1985; 325:322-4. [PMID: 2579707 DOI: 10.1016/0006-8993(85)90332-4] [Citation(s) in RCA: 32] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
Cellular localization of substance P-like immunoreactive (SP-IR) structures in the pre- and postcentral gyri of the human cerebral cortex was examined by indirect immunofluorescence. SP-IR was localized mostly in bipolar and partly in multipolar cells in layers II and IV. SP-IR fibers were also noted in these gyri, especially in layers II and IV.
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Jones RS, Olpe HR. On the role of the baseline firing rate in determining the responsiveness of cingulate cortical neurons to iontophoretically applied substance P and acetylcholine. J Pharm Pharmacol 1984; 36:623-5. [PMID: 6208350 DOI: 10.1111/j.2042-7158.1984.tb04912.x] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Abstract
The relationship between baseline firing rate and the magnitude of excitatory responses to iontophoretically applied substance P (SP) and acetylcholine (ACh) was determined for neurons in the anterior cingulate cortex of the rat. Whereas the size of responses to ACh was positively correlated with the level of ongoing neuronal activity, no correlation, either positive or negative, could be demonstrated for responses to SP. It seems unlikely that the excitatory effects of SP in this brain area result from release of endogenous ACh.
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Jensen RT, Jones SW, Lu YA, Xu JC, Folkers K, Gardner JD. Interaction of substance P antagonists with substance P receptors on dispersed pancreatic acini. BIOCHIMICA ET BIOPHYSICA ACTA 1984; 804:181-91. [PMID: 6202326 DOI: 10.1016/0167-4889(84)90148-4] [Citation(s) in RCA: 38] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
Abstract
In the present study we examined the abilities of three analogs of substance P, [D-Pro2-, D-Phe7-, D-Trp9]-substance P, [D-Pro2-, D- Trp7 ,9]-substance P and [D-Arg1-, D-Pro2-, D- Trp7 ,9-, Leu11 ]-substance P to alter substance P-induced changes in pancreatic acinar cell function and to occupy substance P receptors. At 30 microM, each analog of substance P lacked agonist activity and inhibited amylase secretion stimulated by substance P receptor agonists. The inhibition was reversible and specific for peptides that interact with substance P receptors (physalaemin, substance P, eledoisin, kassinin ). The analogs of substance P did not inhibit the actions of cholecystokinin, caerulein, gastrin, carbamylcholine, secretin, vasoactive intestinal peptide, PHI, ionophore A23187 or 8Br -cAMP. At high concentrations, [D-Arg1-, D-Pro2-, D- Trp7 ,9-, Leu11 ]-substance P, but not [D-Pro2-, D- Trp7 ,9]-substance P or [D-Pro2-, D-Phe7-, D-Trp9]-substance P, caused a small but significant inhibition of bombesin-stimulated amylase release. For each analog of substance P, the inhibition was competitive in nature in that there was a rightward shift of the dose-response curve for physalaemin-stimulated amylase secretion with no change in efficacy. From Schild plots of the ability of [D-Arg1-, D-Pro2-, D- Trp7 ,9-, Leu11 ]-substance P to inhibit either substance p- or physalaemin-stimulated amylase release, the slopes were not different from unity. For each analog of substance P, there was a close correlation between its ability to inhibit substance P- or physalaemin-stimulated amylase release and its ability to inhibit binding of 125I-labeled substance P or 125I-labeled physalaemin. [D-Arg1-, D-Pro2-, D- Trp7 ,9-, Leu11 ]-substance P was 2-fold more potent than [D-Pro2-, D- Trp7 ,9]-substance P which was 4-fold more potent than [D-Pro2-, D-Phe7-, D-Trp9]-substance P, (i.e., pA2 6.1, 5.9, and 5.2, respectively). For each analog, the dose-response curve for its ability to inhibit physalaemin-stimulated amylase release was superimpossible on the dose-response curve for its ability to inhibit binding of 125I-labeled physalaemin. These results indicate that each of these analogs of substance P is a specific competitive inhibitor of the action of the substance P on dispersed acini from guinea-pig pancreas, and that their abilities to inhibit substance P-induced changes in acinar cell function can be accounted for by their abilities to occupy the substance P receptor.
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Barden N, Daigle M, Picard V, Di Paolo T. Perturbation of rat brain serotonergic systems results in an inverse relation between substance P and serotonin concentrations measured in discrete nuclei. J Neurochem 1983; 41:834-40. [PMID: 6192216 DOI: 10.1111/j.1471-4159.1983.tb04816.x] [Citation(s) in RCA: 35] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
Abstract
Since substance P (SP) has been demonstrated to coexist with serotonin (5-HT) in the same population of neurons in the descending raphe system, we have studied the possibility of interactions between these neurotransmitters in other brain areas. Brain nuclei were punched from frozen 300-micron slices of rat brain and extracted with 0.1 M HCIO4 or 2 M acetic acid prior to assay, respectively, of 5-HT content by HPLC with electrochemical detection or SP content by specific radioimmunoassay. Ten days after injection of rats with the 5-HT neurotoxin P-chloroamphetamine (PCA, 10 mg/kg, B.W., i.p.) or 3 days after 5-HT synthesis blockade with p-chlorophenylalanine (PCPA, 300 mg/kg, B.W., i.p.), the 5-HT content of all brain nuclei studied was reduced by means of, respectively, 50% and 81%. In PCA-treated animals, the SP content of the periaqueductal grey matter was significantly increased; PCPA treatment caused, in addition, large increases in the SP content of five other brain nuclei. Blockade of 5-HT receptors by methysergide (15 mg/kg for 5 days) did not significantly change 5-HT levels or turnover, but resulted in 50-200% increases in the SP content of 10 of the 28 brain nuclei studied. Significant decreases in the SP content of numerous areas were seen following treatments (pargyline 30 mg/kg, alone or in combination with 5-hydroxytryptophan, 60 mg/kg) that simultaneously increased 5-HT levels. These results illustrate the modulation of distinct SP-containing systems of the rat brain by perturbation of central serotoninergic pathways and indicate a reciprocal relationship between the SP and 5-HT concentrations of numerous brain nuclei, in particular n. striae terminalis, n. raphe dorsalis, n. accumbens, n. septi, substantia grisea centralis, and n. raphes medianus.
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Cascieri MA, Liang T. Characterization of the substance P receptor in rat brain cortex membranes and the inhibition of radioligand binding by guanine nucleotides. J Biol Chem 1983. [DOI: 10.1016/s0021-9258(18)32552-3] [Citation(s) in RCA: 109] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022] Open
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Jones RS, Olpe HR. A structure-activity profile of substance P and some of its fragments on supraspinal neurones in the rat. Neurosci Lett 1982; 33:67-71. [PMID: 6185886 DOI: 10.1016/0304-3940(82)90131-8] [Citation(s) in RCA: 26] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
Abstract
Responses of neurones in the cingulate cortex to iontophoretically applied substance P (SP) were compared to its various C-terminal fragments. Fragments as short as the hexapeptide sequence were at least as active in increasing neuronal firing as the parent molecule. The pentapeptide sequence was much less active and the tripeptide sequence inactive. Compared on a current basis the octa-, hepta- and hexapeptides all evoked larger responses than the full sequence SP. In addition, the nonapeptide N-terminal sequence of SP had no effect on any neurone on which it was tested.
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Abstract
The actions of cholecystokinin octapeptide (CCK) on the membrane properties of mouse spinal neurons grown in monolayer culture were examined using intracellular recording techniques. In a subpopulation of cells, application of CCK (0.2-100 micron) by pressure ejection from micropipettes produced a small (approximately 2 mV) membrane depolarization that was accompanied by a decrease in membrane conductance (approximately 11 percent). These effects were associated with an enhanced tendency of the cells to generate action potentials when stimulated with intracellular depolarizing current. The unsulfated analog of CCK, which possesses weak biological activity in the gut, had little or no effect on cultured spinal neurons. A number of differences were noted between the responses to CCK and the excitatory amino acid glutamate. First, the effects of CCK were more delayed in onset (approximately 17 sec) and prolonged in duration (approximately 124 sec). Second, the depolarizations produced by glutamate were of larger magnitude and associated with variable effects on membrane conductance. Third, the response to CCK showed tachyphylaxis with repeated applications whereas glutamate remained effective as often as it was applied. It is concluded that CCK facilitates the excitability of spinal neurons in a manner distinct from that of the conventional excitant glutamate.
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Holets V, Elde R. The differential distribution and relationship of serotoninergic and peptidergic fibers to sympathoadrenal neurons in the intermediolateral cell column of the rat: a combined retrograde axonal transport and immunofluorescence study. Neuroscience 1982; 7:1155-74. [PMID: 6180352 DOI: 10.1016/0306-4522(82)91123-x] [Citation(s) in RCA: 178] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
Abstract
The preganglionic sympathetic neurons in the intermediolateral cell column of the thoracic and upper lumbar segments of the spinal cord which innervate the chromaffin cells in the adrenal medulla, sympathoadrenal preganglionic neurons, were identified by the method of retrograde axonal transport of the fluorescent dyes Fast Blue and True Blue. In rats, Fast Blue or True Blue was injected into the medulla of the left adrenal gland. After a survival period of 5 days, the animals were perfusion fixed, the thoracic and lumbar spinal cord sectioned and processed for the immunofluorescent localization of met-enkephalin, neurophysin, oxytocin, serotonin, somatostatin and substance P immunoreactivity. Neuronal perikarya which were retrogradedly-labeled with Fast Blue or True Blue were observed in the intermediolateral cell column from the T1 to the L2 spinal cord segments. The distribution of the sympathoadrenal neurons was determined by counting the number of retrogradedly-labeled neurons per spinal cord segment. In the five animals used for quantifying the sympathoadrenal preganglionic neurons, the majority (72.3%) of the retrogradely-labeled neurons counted per spinal cord were located within the T7-T12 segments. The T9 segment contained the largest average number (20.1%) of retrogradely-labeled cells in a single segment. Met-enkephalin, serotonin and substance P immunoreactive fibers were prominent in the intermediolateral cell column, whereas oxytocin, neurophysin and somatostatin immunoreactive fibers were sparse. The met-enkephalin, serotonin and substance P fibers were seen surrounding both unlabeled and retrogradely-labeled neurons; somatostatin fibers appeared to preferentially contact retrogradely-labeled neurons; whereas, the neurophysin and oxytocin fibers were not found in proximity to retrogradely-labeled neurons. Met-enkephalin, neurophysin, oxytocin, somatostatin and substance P immunoreactivity were depleted in the intermediolateral cell column below the level of a spinal cord transection. Serotonin immunoreactivity was depleted in the intermediolateral cell column below the level of the transection for five to six segments, but sparse networks of immunoreactive fibers were observed in both the intermediolateral cell column and the ventral horn in more caudal segments. Met-enkephalin, serotonin, somatostatin and substance P immunoreactivity were decreased in both the contralateral and ipsilateral intermediolateral cell column below the level of a spinal cord hemisection, suggesting that both crossed and uncrossed descending pathways exist. Neurophysin and oxytocin immunoreactivity were depleted below the level of the hemisection in the ipsilateral intermediolateral cell column without noticeable decrease in the level of immunoreactivity in the contralateral intermediolateral cell column, suggesting that a decussation does not occur at the level of the spinal cord, but may exist above the level of the hemisection...
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Edvinsson L, Uddman R. Immunohistochemical localization and dilatatory effect of substance P on human cerebral vessels. Brain Res 1982; 232:466-71. [PMID: 6200181 DOI: 10.1016/0006-8993(82)90290-6] [Citation(s) in RCA: 80] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
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Bloom FE, Koda LY. Chemical circuitry and central cardiovascular regulation. CLINICAL AND EXPERIMENTAL HYPERTENSION. PART A, THEORY AND PRACTICE 1982; 4:529-41. [PMID: 6125281 DOI: 10.3109/10641968209061597] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
Abstract
In attempting to sort out the functional components responsible for central cardiovascular regulation, circuits which can be defined by their neurotransmitter provide a focus for an initial simplified scheme. Three classes of transmitter-specific circuits can be developed from this perspective. The most prominent class, amino acid-mediated circuits, are illustrated by the presumptive excitatory glutamatergic excitatory efferent projections from baroreceptors to the nucleus tractus solitarius (NTS) and by presumptive inhibitory interneurons intrinsic to reticular system which use gamma-aminobutyrate as a transmitter. Secondly, monoamine-mediated intrinsic and extrinsic projections to the NTS are generally subsumed neuroanatomically within the so-called "non-specific" projection systems but recent cytochemical studies indicate that some organizational principles exist within NTS regions. A third class of chemically defined transmission consists of those circuits attributed to peptidergic neurons, such as endorphins, enkephalins, Substance P, or vasoactive-intestinal peptide (VIP). Although no classes of transmitters or transmitter mechanisms wholly unique to cardiovascular regulation have yet been identified, these 3 classes of transmitter can each mediate a broad range of integrative actions, through unique molecular mechanisms.
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Ogata N, Abe H. Neuropharmacology in the brain slice: effects of substance P on neurons in the guinea-pig hypothalamus. COMPARATIVE BIOCHEMISTRY AND PHYSIOLOGY. C: COMPARATIVE PHARMACOLOGY 1982; 72:171-8. [PMID: 6183050 DOI: 10.1016/0306-4492(82)90081-8] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
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Dodd J, Kelly JS. The actions of cholecystokinin and related peptides on pyramidal neurones of the mammalian hippocampus. Brain Res 1981; 205:337-50. [PMID: 6162516 DOI: 10.1016/0006-8993(81)90344-9] [Citation(s) in RCA: 285] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
Abstract
The presence of cholecystokinin octapeptide (CCK-8) immunoreactivity in the vicinity of the pyramidal neurones of the mammalian hippocampus has allowed us to investigate the central postsynaptic actions of CCK-8 and a number of related peptides, at a site thought to be innervated by a peptidergic pathway. Intracellular records from pyramidal cells of the CA1 region of the hippocampal slice preparation were used to determine changes in excitability and associated changes in membrane potential and resistance evoked by the pressure application of peptides into the cell body layer, from an independently mounted multibarrelled micropipette. The tetra- and octa-peptide C-terminal fragments of cholecystokinin evoked abrupt and rapidly reversible depolarizations which were accompanied by marked increases in excitability and a decrease in membrane input resistance. A comparison was made of the actions of these peptides with those of glutamate, released by iontophoresis from an adjacent barrel of the same multibarrelled pipette. The rate of onset of the cholecystokinin-evoked response was similar to that of the response evoked by glutamate. C-terminal fragments of gastrin (G-13 and G-14) and bombesin were also found to be excitatory to pyramidal neurones in the CA1 region. However, the nonsulphated form of CCK-8 was inactive, as was substance P, a peptide not present in the hippocampus.
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Haeusler G, Osterwalder R. Evidence suggesting a transmitter or neuromodulatory role for substance P at the first synapse of the baroreceptor reflex. NAUNYN-SCHMIEDEBERG'S ARCHIVES OF PHARMACOLOGY 1980; 314:111-21. [PMID: 6161312 DOI: 10.1007/bf00504526] [Citation(s) in RCA: 131] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
Abstract
There is evidence that the undecapeptide substance P is the transmitter released from pain fibres in the dorsal horn of the spinal cord. This, in turn, suggested to use the possibility of a similar role for substance P in another type of primary sensory structure, namely the baroreceptor neurones which terminate in the bulbar nucleus of the solitary tract (NTS). Substance P, injected into a lateral brain ventricle of urethane-anaesthetized rats, caused dose-dependent increases in blood pressure and heart rate. By contrast, local application of substance P to the region of the NTS, using small pieces of filter paper soaked in substance P-containing solution, resulted in hypotension and bradycardia. In cats anaesthetized with urethane, the same procedure also decreased blood pressure, heart rate and spontaneous sympathetic nervous activity. Release of substance P from nerve endings, through local application of capsaicin to the NTS, produced cardiovascular effects which were indistinguishable from those of substance P. A combined cannula-electrode with an uninsulated tip enabled identification of sites in the NTS of rats and cats, where electrical stimulation elicited decreases in blood pressure, heart rate and spontaneous sympathetic nervous activity. These sites were considered to contain the first synapse of the baroreceptor reflex. Subsequent microinjection of substance P through the cannula into these defined areas resulted in effects which were similar to those of the preceding electrical stimulation. The results suggest a transmitter or neuromodulatory role for substance P at the first synapse of the baroreceptor reflex in the NTS.
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Liang T, Cascieri MA. Specific binding of an immunoreactive and biologically active 125I-labeled N(1)acylated substance P derivative to parotid cells. Biochem Biophys Res Commun 1980; 96:1793-9. [PMID: 6160855 DOI: 10.1016/0006-291x(80)91382-0] [Citation(s) in RCA: 34] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
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Luczyńska M, Traczyk WZ. Influence of cerebral ventricles perfusion with hexapeptide derivatives of substance P on evoked tongue jerks in rats. Brain Res 1980; 198:403-10. [PMID: 6157453 DOI: 10.1016/0006-8993(80)90753-2] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
Abstract
The effects of perfusion through cerebral ventricles with two hexapeptides, C-terminal derivatives of substance P, on evoked tongue jerks (ETJ), were studied on male rats. During perfusion, stimulation of the infraorbital nerve caused retractive movements (ETJ) of the stretched tongue, the amplitudes of which were recorded. The mean amplitudes of ETJ recorded during each 10 min period of perfusion with McIlwain-Rodnight's solution and solution containing hexapeptides were compared. The biologically most active C-terminal hexapeptide derivative of substance P (pyro-Glu6)SP6-11, perfused through cerebral ventricles in a concentration of 5 nmol/ml increased the ETJ. This effect was dose-dependent. A 10 times higher concentration in the perfusion fluid of the less biologically active hexapeptide SP6-11 was not effective. The possibility that substance P, and its active fragments present in the fluid in cerebral ventricles, could modulate the reflex centers in the medulla is discussed.
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Stallcup WB, Patrick J. Substance P enhances cholinergic receptor desensitization in a clonal nerve cell line. Proc Natl Acad Sci U S A 1980; 77:634-8. [PMID: 6153798 PMCID: PMC348329 DOI: 10.1073/pnas.77.1.634] [Citation(s) in RCA: 75] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023] Open
Abstract
Substance P inhibits carbamylcholine-induced 22Na+ uptake in the clonal cell line PC12. This inhibition is noncompetitive with agonist but competitive with Na+. Octahydrohistrionicotoxin (H8-HTX) also exhibits this same pattern of inhibition. Moreover, both substance P and H8-HTX are very effective in enhancing agonist-induced receptor desensitization. Local anesthetics, such as QX222, also cause inhibition that is competitive with Na+, but they have only marginal effects on desensitization. Because substance P and H8-HTX cannot by themselves cause desensitization, their action is dependent on and synergistic with the action of agonist. Furthermore, substance P and H8-HTX do not appear to compete for the same site as QX222, which is thought to bind to the ion channel. Finally, substance P can stabilize the desensitized state of the receptor even when added subsequent to the actual desensitization and removal of agonist. Thus, substance P does not require open ion channels for binding and may modulate the activity of the receptor-ionophore complex by binding to a distinct regulatory site.
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Kelley AE, Iversen SD. Substance P infusion into substantia nigra of the rat: behavioural analysis and involvement of striatal dopamine. Eur J Pharmacol 1979; 60:171-9. [PMID: 93550 DOI: 10.1016/0014-2999(79)90216-4] [Citation(s) in RCA: 66] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
The purpose of the present study was to characterize the nature of the behavioural response to substance P (SP) infusion into the substantia nigra and to evaluate this response in 6-hydroxydopamine (6-OHDA) caudate lesioned rats. The effects of SP infusions (3 microgram in 1 microliter bilaterally) were assessed in an open field. Two groups of rats were used: one with 6-OHDA lesions in the caudate nucleus, and one with sham lesions. In sham rats, the first infusion produced a strong increase in sterotyped rearing and sniffing, with no concurrent enhancement of locomotion. With three subsequent infusions (made at interval of two days) the rearing response disappeared and a tendency to groom emerged. All SP-induced behavioural stimulation was blocked in the caudate-lesioned rats; an effect of the lesion itself was reduced rearing. These results suggest that the response to SP infusion is mediated through the nigro-striatal dopamine system. The behavioural profiles which emerge after SP infusion into the substantia nigra and ventral tegmental area are compared. In general, the behavioural studies of SP effects support the concept that the A9 and A10 dopamine systems can be behaviourally differentiated.
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Katayama Y, North RA, Williams JT. The action of substance P on neurons of the myenteric plexus of the guinea-pig small intestine. PROCEEDINGS OF THE ROYAL SOCIETY OF LONDON. SERIES B, BIOLOGICAL SCIENCES 1979; 206:191-208. [PMID: 42923 DOI: 10.1098/rspb.1979.0101] [Citation(s) in RCA: 87] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
Extracellular and intracellular recordings were made in vitro from single neurons of the myenteric plexus of the guinea-pig small intestine. Synthetic substance P was applied to the neurons by means of the perfusing solution or by electrophoresis from micropipettes. Extracellular recording showed that substance P (100 pm-30 nm), applied by perfusion, increased the firing rate of myenteric neurons. Intracellular recording indicated that perfusion with substance P caused a dose-dependent membrane depolarization which was unaffected by hexamethonium, hyoscine, naloxone or baclofen. The depolarization was also evoked by electrophoretic application of substance P. It was associated with an increase in membrane resistance, augmented by membrane depolarization and reduced by membrane hyperpolarization. The relation between the substance P reversal potential and the logarithm of the extracellular potassium concentration was linear with a slope of 54 mV/log10[K+], which indicates that substance P inactivates the resting potassium conductance of the myenteric neurons. This effect on ion conductance is the same as that of an unknown substance that mediates slow synaptic excitations with the myenteric plexus.
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Abstract
The 22 amino acid polypeptide motilin was tested by iontophoretic application onto neurons in the rat cerebral cortex and by perfusion over the isolated hemisected toad spinal cord. Motilin (25--150 nA) excited identified cortico-spinal neurons and other deep spontaneously firing cortical cells. Excitation developed relatively rapidly and lasted for up to 60 sec after the application. Motilin was a potent excitant (threshold concentration 2.5 x 10(-9) M) of neurons in the amphibian spinal cord, eliciting a depolarization of dorsal root terminals and motoneurons. Its effects were substantially reduced after tetrodotoxin, suggesting a primary site of action on spinal cord interneurons.
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Vincent JD, Barker JL. Substance P: evidence for diverse roles in neuronal function from cultured mouse spinal neurons. Science 1979; 205:1409-12. [PMID: 224464 DOI: 10.1126/science.224464] [Citation(s) in RCA: 81] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
Mouse spinal neurons grown in tissue culture were used to examine the membrane mechanisms of action of the peptide substance P. Two functionally distinct actions were observed, one being a rapidly desensitizing excitation, and the other being a dose-dependent, reversible depression of excitatory responses to the putative amino acid neurotransmitter glutamate. These effects on excitability suggest that substance P may play more than one role in intercellular communication in the nervous system.
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Zieglgänsberger W, Tulloch IF. Effects of substance P on neurones in the dorsal horn of the spinal cord of the cat. Brain Res 1979; 166:273-82. [PMID: 218693 DOI: 10.1016/0006-8993(79)90213-0] [Citation(s) in RCA: 143] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
The activity of single, physiologically identified neurones has been recorded both extra- and intracellularly in the 6th and 7th lumbar segments of the pentobarbitone-anaesthetized cat. In the majority of dorsal horn neurones studies (laminae 4 and 5 of Rexed) microiontophoretically applied synthetic substance P and the active fragment, substance P (4--11), were found to cause a slow and prolonged increase of the spontaneous firing rate and/or an enhancement of L-glutamate induced activity. Intracellular studies revealed that substance P caused a reversible depolarization of both dorsal horn neurones and motoneurones without a detectable alteration of the membrane resistance, antidromic action potential or postsynaptic potentials. These results are compatible with a possible role of substance P in sensory transmission in the spinal cord of the cat.
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Mayer ML, MacLeod NK. The excitatory action of substance P and stimulation of the stria terminalis bed nucleus on preoptic neurones. Brain Res 1979; 166:206-10. [PMID: 421152 DOI: 10.1016/0006-8993(79)90666-8] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
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Livett BG, Kozousek V, Mizobe F, Dean DM. Substance P inhibits nicotinic activation of chromaffin cells. Nature 1979; 278:256-7. [PMID: 423974 DOI: 10.1038/278256a0] [Citation(s) in RCA: 147] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
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Guyenet PG, Aghajanian GK. ACh, substance P and met-enkephalin in the locus coeruleus: pharmacological evidence for independent sites of action. Eur J Pharmacol 1979; 53:319-28. [PMID: 217695 DOI: 10.1016/0014-2999(79)90455-2] [Citation(s) in RCA: 208] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
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