Indirect Action of Elevated Potassium and Neuropeptide Y on αMSH Secretion from the Pars Intermedia of Xenopus laevis: A Biochemical and Morphological Study

1991 ◽  
Vol 54 (1) ◽  
pp. 68-76 ◽  
Author(s):  
Harry P. de Koning ◽  
Bruce G. Jenks ◽  
Wim J.J.M. Scheenen ◽  
Eveline P.C.T. de Rijk ◽  
Raymond T.J.M. Caris ◽  
...  
Keyword(s):  
Neuropeptide Y ◽  
Morphological Study ◽  
Pars Intermedia ◽  
Indirect Action

Neuropeptide Y: Direct and indirect action on insulin secretion in the rat

Peptides ◽  
1985 ◽  
Vol 6 (6) ◽  
pp. 1155-1159 ◽  
Author(s):  
John H. Moltz ◽  
John K. McDonald
Keyword(s):  
Insulin Secretion ◽  
Neuropeptide Y ◽  
Indirect Action

scholarly journals An Indirect Action Contributes to C-Fos Induction in Paraventricular Hypothalamic Nucleus by Neuropeptide Y

2016 ◽  
Vol 6 (1) ◽  
Author(s):  
Shengjie Fan ◽  
Janani Dakshinamoorthy ◽  
Eun Ran Kim ◽  
Yong Xu ◽  
Cheng Huang ◽  
...  
Keyword(s):  
Neuropeptide Y ◽  
Hypothalamic Nucleus ◽  
Paraventricular Hypothalamic Nucleus ◽  
Indirect Action

THE EFFECTS OF INGESTION OF HYPERTONIC SALINE ON THE PITUITARY GLAND IN THE RAT: A MORPHOLOGICAL STUDY OF THE PARS INTERMEDIA AND POSTERIOR LOBE

1962 ◽  
Vol 25 (2) ◽  
pp. 161-NP ◽  
Author(s):  
L. W. DUCHEN
Keyword(s):  
Sodium Chloride ◽  
Pituitary Gland ◽  
Mitotic Activity ◽  
Hypertonic Saline ◽  
Morphological Study ◽  
Tap Water ◽  
Neurosecretory Material ◽  
Pars Intermedia ◽  
Posterior Lobe ◽  
Neurohypophysial Hormones

SUMMARY The microscopic changes occurring in the pars intermedia and posterior lobe of the pituitary gland were studied in rats given 2% sodium chloride in place of tap water for periods ranging from 1 to 21 days. In the pars intermedia small, strongly PAS-positive cells which are normally few in number became very numerous during the first few days of treatment with saline. After longer periods on saline these changes appeared to regress. Mitotic activity in the pars intermedia and posterior lobe was studied using colchicine. Mitoses were present in the pars intermedia of control rats but not in that of salt-loaded rats. In the posterior lobe mitoses were not present in control rats but were numerous in rats drinking saline, and the greatest numbers were seen after 4 days. The neurosecretory material (NSM) was lost from the posterior lobe within the first 8 days, and it is suggested that there is a relationship between the loss of NSM and mitotic activity in the posterior lobe. The significance of the changes in the pars intermedia is not apparent at present but may be related to the removal of neurohypophysial hormones.

scholarly journals A combined electrophysiological and morphological study of neuropeptide Y–expressing inhibitory interneurons in the spinal dorsal horn of the mouse

Pain ◽  
2016 ◽  
Vol 157 (3) ◽  
pp. 598-612 ◽  
Author(s):  
Noboru Iwagaki ◽  
Robert P. Ganley ◽  
Allen C. Dickie ◽  
Erika Polgár ◽  
David I. Hughes ◽  
...  
Keyword(s):  
Neuropeptide Y ◽  
Dorsal Horn ◽  
Morphological Study ◽  
Spinal Dorsal Horn ◽  
Inhibitory Interneurons ◽  
Spinal Dorsal

Neuropeptide Y does not inhibit the release of α-MSH from the pars intermedia of the rat adenohypophysis

1988 ◽  
Vol 66 (3) ◽  
pp. 318-320 ◽  
Author(s):  
J. Kraicer ◽  
B. Lussier ◽  
S. Kotanen ◽  
B. C. Moor
Keyword(s):  
Neuropeptide Y ◽  
Rana Pipiens ◽  
Pars Intermedia ◽  
Regulatory Peptide

Neuropeptide Y in concentrations from 10−8 to 10−6 M inhibits the release of α-MSH from the frog (Rana pipiens) pituitary in a reversible, sustained, and concentration-related manner. However, it does not inhibit the release of α-MSH from the rat pars intermedia. Thus, while neuropeptide Y may play a role in the control of α-MSH release in amphibia, it appears not to be a regulatory peptide for the mammalian pars intermedia.

Techniques for preparing the Lolium perenne coleorhiza for scanning electron microscope evaluation

1992 ◽  
Vol 50 (1) ◽  
pp. 766-767
Author(s):  
Susan B.G. Debaene ◽  
John S. Gardner ◽  
Phil S. Allen
Keyword(s):  
Electron Microscope ◽  
Scanning Electron Microscope ◽  
Lolium Perenne ◽  
Morphological Study ◽  
Root Hairs ◽  
Inner Pressure ◽  
Water Potentials ◽  
Radicle Emergence ◽  
Standard Fixation ◽  
Scanning Electron

The coleorhiza is a nonvascular sheath that encloses the embryonic radicle in Poaceae, and is generally the first tissue to emerge during germination. Delicate hairlike extensions develop from some coleorhiza cells prior to radicle emergence. Similar to root hairs, coleorhiza hairs are extremely sensitive to desiccation and are damaged by exposure to negative water potentials. The coleorhiza of Lolium perenne is somewhat spherical when first visible, after which a knob forms at a right angle to the caryopsis due to inner pressure from the elongating radicle. This knob increases in length until the radicle finally punctures the coleorhiza. Standard fixation procedures cause severe desiccation of coleorhiza cells and hairs, making morphological study of the coleorhiza difficult. This study was conducted to determine a more successful process for coleorhiza preservation.

Ultrastructural investigation of an adenoma of the pituitary post mortem

1987 ◽  
Vol 45 ◽  
pp. 622-623
Author(s):  
Shirley Siew ◽  
W. C. deMendonca
Keyword(s):  
Deleterious Effect ◽  
Anterior Lobe ◽  
Definitive Diagnosis ◽  
Pars Intermedia ◽  
Post Mortem ◽  
Close Apposition ◽  
Autopsy Material ◽  
Progressive Loss ◽  
Transmission Electron ◽  
Means Of Transmission

The deleterious effect of post mortem degeneration results in a progressive loss of ultrastructural detail. This had led to reluctance (if not refusal) to examine autopsy material by means of transmission electron microscopy. Nevertheless, Johannesen has drawn attention to the fact that a sufficient amount of significant features may be preserved in order to enable the establishment of a definitive diagnosis, even on “graveyard” tissue.Routine histopathology of the autopsy organs of a woman of 78 showed the presence of a well circumscribed adenoma in the anterior lobe of the pituitary. The lesion came into close apposition to the pars intermedia. Its architecture was more compact and less vascular than that of the anterior lobe. However, there was some grouping of the cells in relation to blood vessels. The cells tended to be smaller, with a higher nucleocytoplasmic ratio. The cytoplasm showed a paucity of granules. In some of the cells, it was eosinophilic.

Abnormal levels of neuropeptide Y and peptide YY in colon in the irritable bowel syndrome (IBS)

2001 ◽  
Vol 120 (5) ◽  
pp. A753-A754
Author(s):  
M SIMREN ◽  
G RINGSTROM ◽  
P STOTZER ◽  
H ABRAHAMSSON ◽  
E BJOMSSON
Keyword(s):  
Irritable Bowel Syndrome ◽  
Neuropeptide Y ◽  
Peptide Yy ◽  
Irritable Bowel
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