Appearance Of Neuropeptides Research Articles

Phylogenetic appearance of neuropeptide S precursor proteins in tetrapods

Sleep and emotional behavior are two hallmarks of vertebrate animal behavior, implying that specialized neuronal circuits and dedicated neurochemical messengers may have been developed during evolution to regulate such complex behaviors. Neuropeptide S (NPS) is a newly identified peptide transmitter that activates a typical G protein-coupled receptor. Central administration of NPS produces profound arousal, enhances wakefulness and suppresses all stages of sleep. In addition, NPS can alleviate behavioral responses to stress by producing anxiolytic-like effects. A bioinformatic analysis of current genome databases revealed that the NPS peptide precursor gene is present in all vertebrates with the exception of fish. A high level of sequence conservation, especially of aminoterminal structures was detected, indicating stringent requirements for agonist-induced receptor activation. Duplication of the NPS precursor gene was only found in one out of two marsupial species with sufficient genome coverage ( Monodelphis domestica; opossum), indicating that the duplicated opossum NPS sequence might have arisen as an isolated event. Pharmacological analysis of both Monodelphis NPS peptides revealed that only the closely related NPS peptide retained agonistic activity at NPS receptors. The duplicated precursor might be either a pseudogene or could have evolved different receptor selectivity. Together, these data show that NPS is a relatively recent gene in vertebrate evolution whose appearance might coincide with its specialized physiological functions in terrestrial vertebrates.

Correlation between the Appearance of Neuropeptides in the Rat Trigeminal Ganglion and Reinnervation of the Healing Root Socket after Tooth Extraction

The neuropeptide substance P (SP) modulates bone metabolism. This study examined the temporal appearance of the neuropeptides SP and brain-derived nerve growth factor (BDNF) and their receptors (neurokinin-1 receptor (NK1-R) and Trk B, respectively) in the rat trigeminal ganglion to investigate the role of neuropeptides in healing after tooth extraction. Rats were anesthetized and their upper right first molars were extracted; the rats were sacrificed 3 hours and 1–21 days after extraction. Their trigeminal ganglion and maxilla were removed, and cryosections were prepared and immunostained using specific antibodies against SP, BDNF, NK1-R, and Trk B. In the tooth sockets after extraction, new bone and a few SP-­immunoreactive nerve fibers were first seen at day 7, and bone completely filled the sockets at day 21. In the trigeminal ganglion, the proportions of NK1-R-, BDNF-, and Trk B-immuno­reactive neurons changed similarly, i.e., they initially decreased, increased rapidly to ­maximum levels by day 3, and then decreased gradually to control levels until 21 days. These findings suggest that the appearance of neuropeptides in the trigeminal ganglion, the reinnervation of SP-immunoreactive nerve fibers, and bone repair in the tooth socket during healing after extraction were correlated.

15. ラット臼歯抜歯後の三叉神経節と抜歯窩における神経ペプチドの発現(口頭発表,第66回九州歯科学会総会講演抄録)

15. ラット臼歯抜歯後の三叉神経節と抜歯窩における神経ペプチドの発現(口頭発表,第66回九州歯科学会総会講演抄録)

3. ラット臼歯抜歯後の三叉神経節における神経ペプチド発現と,抜歯治癒過程における再神経支配の関係(2月例会講演抄録)

3. ラット臼歯抜歯後の三叉神経節における神経ペプチド発現と,抜歯治癒過程における再神経支配の関係(2月例会講演抄録)

Correlation between the appearance of neuropeptides in the rat trigeminal ganglion and reinnervation of the healing root socket after tooth extraction

Correlation between the appearance of neuropeptides in the rat trigeminal ganglion and reinnervation of the healing root socket after tooth extraction

Control of postganglionic neurone phenotype by the rat pineal gland

As neurones develop they are faced with choices as to which genes to express, to match their final phenotype to their role in the nervous system. A number of processes can guide these decisions. Within the autonomic and sensory nervous systems, there are a handful of examples that suggest that one mechanism that may match phenotype to function is the presence of target-derived differentiation factors. We tested whether the rat pineal gland controls the expression of a neuropeptide (neuropeptide Y) and a calcium-binding protein (calbindin) in sympathetic postganglionic neurones that innervate it. We first showed that the chemical phenotype of sympathetic neurones innervating the rat pineal includes the expression of both neuropeptide Y and the calcium-binding protein, calbindin. After transplanting the pineal gland of neonatal rats into the submandibular salivary gland of neonatal hosts, it was innervated by sympathetic axons from the surrounding salivary gland tissue, which do not normally express neuropeptide Y and calbindin. The presence of the pineal gland led to the appearance of neuropeptide Y and calbindin in many of the postganglionic neurones that innervated the graft. From these findings we suggest that, like the rodent sweat gland, the pineal gland generates a signal that can direct the neurochemical phenotype of innervating sympathetic neurones.

Changes in the expression of neuropeptide Y (NPY) during maturation of human sympathetic ganglionic neurons: correlation with tyrosine hydroxylase immunoreactivity

Developmental patterns of neuropeptide Y (NPY) and tyrosine hydroxylase (TH)-immunoreactivities (IR) were investigated using the method of indirect immunohistochemistry in the stellate and thoracic sympathetic ganglia of human neonates ranging in gestational age from 24 to 27 weeks (premature group) and from 38 to 41 weeks (mature group). In the paravertebral ganglia of premature neonates a small (up to 7%) population of NPY-IR nerve cells was revealed. With the gestational age increase (a mature group), a marked elevation of the number of NPY-IR ganglionic neurons (up to 41%) was noted. In contrast, in the sympathetic ganglia of premature neonates almost all the neurons were tyrosine hydroxylase immunoreactive and any change in pattern during maturation was insignificant. The results demonstrate an age-related increase of neuropeptide Y-immunoreactivity in human paravertebral ganglia during maturation, and suggest that peptidergic co-transmission arises later in development than do the classical autonomic messengers. Adaptability of the fetus to a new external environment at birth demands a qualitatively new activity level of the autonomic nervous system, and this is provided side by side with the classical messengers noradrenaline and acetylcholine by the co-transmitter and modulating role of the neuropeptides. The appearance of neuropeptide Y in the principal sympathetic ganglionic neurons defines not only a qualitatively new level in the functional regulation of target organs at birth, but serves as an index of neonatal maturity.

Distribution of neuropeptides in the inferior nasal turbinate mucosa of patients with allergic rhinitis

An immunohistochemical study was made on the distribution of neuropeptides in 36 surgical specimens of the inferior nasal turbinate mucosa obtained from 32 patients with allergic rhinitis. Eleven patients (15 specimens) of the 32 underwent chemosurgery in which trichloracetic acid (TCA) was used before excision. In these patients a watery nasal discharge remained even after TCA application, although the nasal obstruction decreased. As a control, 6 specimens obtained from 6 patients with non-allergic rhinitis were also studied. In the present study, the distribution of Substance P (SP) was examined as an index of the parasympathetic nervous system. The distribution of nerve fibers showing a positive reaction specific to each of the two types of neuropeptides was examined in the frontal sections of the specimens at distances of 5 and 15 mm from the anterior tip of the inferior turbinate. In particular, the modes of the distribution in the superficial and deep layers of the mucosa were compared. It was found that, in the patients with allergic rhinitis who had not undergone TCA treatment, both SP-positive and VIP-positive fibers were abundant in the anterior portion of the turbinate immediately beneath the basement membrane. In those patients who underwent chemosurgery prior to excision, SP-positive fibers were very scarce in both superficial and deep layers, whereas VIP-positive fibers appeared to exist only in the deep layer around the remaining nasal glands. In the specimens obtained from patients with non-allergic rhinitis, there was no appreciable difference in the pattern of distribution of SP-and VIP-positive fibers among different sites of the specimens. The present study would indicate that chemosurgery using TCA inhibited the appearance of neuropeptides and resulted in improvement in clinical symptoms. However, in those patients having a continuous watery discharge even after TCA treatment, the function of the remaining nasal glands might be responsible for the symptom, although the contribution of VIP to the increase in vasopermeability should also be taken into consideration. Further studies are needed to determine the distribution of neuropeptides around the vessel walls.

Appearance of neuropeptides and NADPH-diaphorase during development of the enteropancreatic innervation

Pancreactic ganglia are formed by neural crest-derived precursors, are innervated by enteric neurons, and contain neuropeptides. In addition, the enzyme NADPH-diaphorase is located in a subset of enteric and pancreatic neurons. The expression of neural markers (GAP-43 and NC-1), neurotransmitter-related markers (including neuropeptide Y (NPY), vasoactive intestinal peptide (VIP), gastrin-releasing peptide (GRP), galanin (GAL), dopamine β hydroxylase (DBH), substance P (SP), calcitonin gene-related peptide (CGRP), and NADPH-diaphorase was studied in the fetal and neonatal rat gut and pancreas (E12–P28) in situ and in vitro. NC-1, GAP-43 and DBH-immunoreactive cells were found in the primordial stomach on day E12, and in the pancreas on day E13, along with NPY in endocrine cells. Pancreatic NPY-immunoreactive neurons were detected by day E18. CGRP was seen in the foregut at day E12 but not in the pancreas until day E14. Other neuropeptides (SP, GAL, GRP and VIP) all appeared in the foregut earlier than in the pancreas. NADPH-diaphorase activity was first found in situ in foregut neurons on day E13, and in the pancreas on day E14, but seen in explants a day earlier. These observations show that development of neurons occurs earlier in the gut than in the pancreas, and that NADPH-diaphorase activity appears earlier than the immunoreactivities of the neuropeptides.

Ontogeny of nerves and neuropeptides in skin of rat: an immunocytochemical study.

The sequence of maturation of nerves and appearance of neuropeptides was investigated in skin from fetal and neonatal rats by immunocytochemistry using antisera to protein gene product 9.5, substance P, calcitonin gene-related peptide (CGRP), vasoactive intestinal polypeptide (VIP) and neuropeptide Y (NPY). Immunoreactivity for PGP 9.5 appeared on fetal day 16 in face and nose, somewhat later (fetal day 19) in paws and tail. The sensory neuropeptides, CGRP/substance P (fetal day 19 and postnatal day 1, respectively) appeared earlier than the autonomic peptides VIP and NPY (postnatal day 7). Thus, the study shows that neuropeptides do not appear simultaneously with nerves and that the development is rostrocaudal.

Cell size-specific appearance of neuropeptide Y in the trigeminal ganglion following peripheral axotomy of different branches of the mandibular nerve of the rat

The effect of peripheral axotomy of the mental nerve (MN) and the cutaneous branch of the mylohyoid nerve (MhN) on the appearance of neuropeptide Y-like immunoreactivity (NPY-IR) in cells in the trigeminal ganglion of the rat was examined with combined retrograde-tracing and immunohistochemistry. Retrograde-tracing with True Blue (TB) revealed that the cell-size spectrum of the trigeminal cells sending peripheral processes to the MN (TB MN cells) ranged from 75.9 to 1560.5 μm 2 (or from 9.8 to 44.6 μm in diameter); ∼53% of TB MN cells were 300–600 μm 2. TB MhN cells ranged from 47.7 to 1261.5 μm 2 (or from 7.8 to 40.1 μm in diameter); 56% of TB MhN cells were <300 μm 2. In the normal trigeminal ganglion, there were no NPY-IR cells. 14 days after MN transection, ∼35% of TB MN cells displayed NPY-IR. The distribution of the cross-sectional areas of NPY-IR cells after MN transection was very similar to that of TB MN cells. Transection of MhN also induced the appearance of NPY-IR in the trigeminal ganglion but to a lesser extent (∼17% of TB MhN cells). The distribution of the cross-sectional areas of NPY-IR cells after MhN transection was similar to that of NPY-IR cells after MN transection. These results indicate that injury-evoked NPY-IR is specific for the medium- and large-sized ganglion cells.

291 Distinct patterns of appearance of neuropeptides in acute inflammatory reactions of the human lung

291 Distinct patterns of appearance of neuropeptides in acute inflammatory reactions of the human lung

Appearance of neuropeptides in ascitic fluid after peritoneal therapy with interleukin-2 and lymphokine-activated killer cells for intraabdominal malignancy

Administration of intravenous interleukin-2 (IL-2), followed by intraperitoneal IL-2 and autologous lymphokine-activated killer (LAK) cells to six patients with colonic, ovarian, or endometrial carcinoma restricted to peritoneal spread increased significantly the ascitic fluid concentrations of the neuropeptides substance P (SP) and calcitonin-gene related peptide (CGRP). After intravenous IL-2 alone, the level of SP rose 10- to 140-fold, without a change in that of CGRP. Intraperitoneal IL-2 and LAK cells led to elevations in the concentrations of SP and CGRP to respective maximal means of 319 and 175 pM after 8 hr, which were maintained for 24-48 hr without alterations in the levels of vasoactive intestinal peptide or somatostatin. SP and CGRP from peritoneal fluid were chromatographically indistinguishable from synthetic neuropeptides. The increases in concentrations of SP and CGRP after IL-2 and LAK-cell therapy are the first demonstration of a neural response to a human cellular immunological reaction. The time course and magnitude of the neuropeptide response suggest a role in the vascular side effects of this form of treatment.