Immunoreactivity to vasoactive intestinal polypeptide (VIP) in the hypothalamus of the domestic fowl, Gallus domesticus

Esposito, Vincenzo; Girolamo, Paolo de; Gargiulo, Giuseppe

doi:10.1016/0143-4179(93)90086-p

Cited by 11 publications

(9 citation statements)

References 27 publications

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“…This hypothesis is supported by the presence of NPY‐binding sites both in cultured adenohypophysial cells and in the pituitary of chicken (Merckaert and Vandesande, 1990, 1996). Previous studies conducted by us showed that the periventricular region of chick hypothalamus contained several non‐NPY peptides (Esposito et al, 1992, 1993, 1997). The colocalization and interaction of these peptides with NPY still need to be determined.…”

Section: Discussionmentioning

confidence: 91%

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Anatomical distribution of NPY‐like immunoreactivity in the domestic chick brain (Gallus domesticus)

Esposito¹,

Pelagalli²,

Girolamo³

et al. 2001

Anat. Rec.

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Neuropeptide Y-immunoreactive (NPY-ir) fibers and neurons in the brain of the domestic chick (Gallus domesticus) were described using an immunohistochemical technique. NPY-ir neurons were seen in the lobus parolfactorius; hyperstriatum, neostriatum, paleostriatum, and archistriatum; hippocampal and parahippocampal areas; dorsolateral corticoid area; piriform cortex; two thalamic areas contiguous to the n. rotundus; n. dorsolateralis anterior thalami, pars lateralis, and pars magnocellularis; n. periventricularis hypothalami; n. paraventricularis magnocellularis; regio lateralis hypothalami; n. infundibuli; inner zone of the median eminence; dorsal and lateral portions of the n. opticus basalis; n. raphes; and n. reticularis paramedianus. NPY-ir fibers were seen throughout the entire chick brain, but were more abundant in the hypothalamus where they formed networks and pathways. They were also observed in some circumventricular organs. The anatomical data of the present study regarding the distribution of NPY ir in the chick brain, together with the physiological findings of other studies, suggest that NPY plays a key role in the regulation of the neuroendocrine, vegetative, and sensory systems of birds by acting as a neuromodulator and/or neurotransmitter.

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Section: Discussionmentioning

confidence: 91%

“…Ten brains of 2‐week‐old male chicks ( Gallus domesticus ) were obtained and processed as previously described (Esposito et al, 1993), in order to have 5–7‐μm sagittal and coronal paraffin sections.…”

Section: Methodsmentioning

confidence: 99%

Anatomical distribution of NPY‐like immunoreactivity in the domestic chick brain (Gallus domesticus)

Esposito¹,

Pelagalli²,

Girolamo³

et al. 2001

Anat. Rec.

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“…The chemoarchitecture of the mSCN and vSCN has been studied in other bird species to a limited degree (Gamlin et al, 1982;Panzica, 1985;Cassone and Moore, 1987;Norgren and Silver, 1990;Esposito et al, 1993). The most extensive study concentrated on only the vSCN of the house sparrow (Cassone and Moore, 1987).…”

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confidence: 99%

Chicken suprachiasmatic nuclei: II. Autoradiographic and immunohistochemical analysis

Cantwell

Cassone

2006

J of Comparative Neurology

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The vertebrate circadian system is composed of multiple inputs, oscillators, pacemakers, and outputs. In birds, the pineal gland and retinae have been defined as pacemakers within this system. Evidence for a third, hypothalamic pacemaker is abundant. It has been presumed that this pacemaker is homologous to the mammalian suprachiasmatic nucleus (SCN). Two candidate structures have been referred to as the avian SCN--the medial SCN (mSCN) and the visual SCN (vSCN). Previously, we suggested that both structures are involved in a "suprachiasmatic complex." To further explore evidence for an avian SCN, the present study employed several classical techniques to assess intrinsic characteristics of the mSCN and vSCN in the chicken. First, analysis of mSCN and vSCN cytoarchitecture indicated that the mSCN is similar in location and cell population to the mammalian SCN, while the vSCN is more similar in terms of its shape. Second, intravitreal injections of tritiated proline were used to identify hypothalamic retinal terminals. The findings support previous studies identifying the vSCN as the primary retinorecipient hypothalamic structure in birds. Third, analysis of mSCN and vSCN chemoarchitecture suggests that both the mSCN and vSCN display similarity to the mammalian SCN, which displays significant interspecies variation. Finally, a unique astrocytic bridge between the mSCN and vSCN is demonstrated, suggesting that astrocytes play a role within the suprachiasmatic nuclei of birds, similar to the situation in mammals. Our previously presented working model of the avian suprachiasmatic complex is updated to include these data.

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“…Furthermore, the distribution of the beacon‐ir in some chick anterior hypothalamic sites (viz. POP, SCNm, MPO, SOv and SOe) overlaps that of VIP‐ and NPY‐containing neuronal elements (Esposito et al., 1993, 2001) suggesting a possible functional correlation between these peptides.…”

Section: Discussionmentioning

confidence: 96%

“…In order to perform this immunohistochemical study, ten brains of 2‐week‐old male (seven) and female (three) chicks ( Gallus domesticus ) were obtained and processed as described previously (Esposito et al., 1993). Sagittal and coronal brain paraffin sections of 6–7 μ m thick were processed for immunohistochemistry by means of the standard peroxidase–antiperoxidase (PAP).…”

Section: Methodsmentioning

confidence: 99%

Beacon‐Like Immunoreactivity in the Hypothalamus of Domestic Chick

Esposito

Girolamo

Gargiulo

et al. 2006

Anat Histol Embryol

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Beacon-immunoreactive (B-ir) fibres and neurons in the hypothalamus of the domestic chick (Gallus domesticus) were studied using an immunohistochemical technique in order to verify the presence and elucidate the pattern of distribution of this novel peptide in an avian brain. B-ir neurons were seen in the n. supraopticus, pars ventralis and pars externus; n. magnocellularis preopticus, pars dorsalis, medialis and ventralis; n. preopticus periventricularis; n. suprachiasmaticus, pars medialis; n. ventrolateralis thalami. Only few B-ir cells were scattered in the most anterior part of the lateral hypothalamic area. B-ir fibres, appearing as thin punctuate structures, were seen mainly along the walls of the third ventricle and in the ventromedial hypothalamus. Labelled fibres and terminals were located in the external and internal zones of the anterior and posterior median eminence. In particular, fibre terminals were seen close to the capillary loops of the hypothalamo-hypophysial portal system. The anatomical data of the present study regarding the distribution of B-ir in the chick hypothalamus suggest that beacon may play a key role in the regulation of the neuroendocrine system by acting as a neuromodulator and/or neurotransmitter.

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Immunoreactivity to vasoactive intestinal polypeptide (VIP) in the hypothalamus of the domestic fowl, Gallus domesticus

Cited by 11 publications

References 27 publications

Anatomical distribution of NPY‐like immunoreactivity in the domestic chick brain (Gallus domesticus)

Anatomical distribution of NPY‐like immunoreactivity in the domestic chick brain (Gallus domesticus)

Chicken suprachiasmatic nuclei: II. Autoradiographic and immunohistochemical analysis

Beacon‐Like Immunoreactivity in the Hypothalamus of Domestic Chick

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