Comments on “reply to ‘comments on “moebius syndrome: Animal model—human correlations and evidence for a brainstem vascular etiology”’”

Teratology ◽  
1992 ◽  
Vol 45 (6) ◽  
pp. 587-588 ◽  
Author(s):  
Janet McCredie
Keyword(s):  
Animal Model ◽  
Moebius Syndrome

scholarly journals Mice with targeted disruption of Hoxb-1 fail to form the motor nucleus of the VIIth nerve

Development ◽  
1996 ◽  
Vol 122 (10) ◽  
pp. 3217-3228 ◽  
Author(s):  
J.M. Goddard ◽  
M. Rossel ◽  
N.R. Manley ◽  
M.R. Capecchi
Keyword(s):  
Animal Model ◽  
Facial Nerve ◽  
Mutant Mice ◽  
Clinical Profile ◽  
Human Diseases ◽  
Motor Nucleus ◽  
Moebius Syndrome ◽  
Targeted Disruption ◽  
Adult Mice ◽  
Motor Component

Mice were generated with targeted disruptions in the hoxb-1 gene. Two separate mutations were created: the first disrupts only the homeodomain and the second inactivates the first exon as well as the homeodomain. The phenotypes associated with these two mutant alleles are indistinguishable in surviving adult mice. The predominant defect in these mutant mice is a failure to form the somatic motor component of the VIIth (facial) nerve, possibly through a failure to specify these neurons. The phenotype of hoxb-1 mutant homozygotes closely resembles features of the clinical profile associated with humans suffering from Bell's Palsy or Moebius Syndrome. These animals should therefore provide a useful animal model for these human diseases.

Moebius syndrome: Animal model—human correlations and evidence for a brainstem vascular etiology

Teratology ◽  
1989 ◽  
Vol 40 (4) ◽  
pp. 339-350 ◽  
Author(s):  
A. H. Lipson ◽  
W. S. Webster ◽  
P. D. C. Brown-Woodman ◽  
R. A. Osborn
Keyword(s):  
Animal Model ◽  
Moebius Syndrome

Reply to “comments on ‘Moebius syndrome: Animal model—human correlations and evidence for a brainstem vascular etiology’”

Teratology ◽  
1991 ◽  
Vol 43 (6) ◽  
pp. 557-557 ◽  
Author(s):  
A. H. Lipson ◽  
W. S. Webster ◽  
P. D. C. Brown-Woodman ◽  
R. A. Osborn
Keyword(s):  
Animal Model ◽  
Moebius Syndrome

Comments on “Moebius syndrome: Animal model—Human correlations and evidence for a brainstem vascular etiology”

Teratology ◽  
1991 ◽  
Vol 43 (6) ◽  
pp. 555-556 ◽  
Author(s):  
Beth Alderman ◽  
Beth Mueller ◽  
Lorna G. Moore
Keyword(s):  
Animal Model ◽  
Moebius Syndrome

Reply to “comments on ‘reply to “comments on ‘moebius syndrome: Animal model—human correlations and evidence for a brainstem vascular etiology’”’”

Teratology ◽  
1992 ◽  
Vol 45 (6) ◽  
pp. 589-590 ◽  
Author(s):  
A. H. Lipson ◽  
W. S. Webster ◽  
P. D. C. Brown-Woodman ◽  
R. A. Osborn
Keyword(s):  
Animal Model ◽  
Moebius Syndrome

Ultrastructural investigation of spontaneous pituitary gonadotroph cell adenomas in aging Sprague-Dawley rats

1983 ◽  
Vol 41 ◽  
pp. 702-703
Author(s):  
D. J. McComb ◽  
J. Beri ◽  
F. Zak ◽  
K. Kovacs
Keyword(s):  
Electron Microscopy ◽  
Animal Model ◽  
Epoxy Resin ◽  
Immunoelectron Microscopy ◽  
Tumor Type ◽  
Gonadal Function ◽  
Sprague Dawley ◽  
Male And Female ◽  
Reticulin Fibers ◽  
Sprague Dawley Rats

Gonadotroph cell adenomas of the pituitary are infrequent in human patients and are not invariably associated with altered gonadal function. To date, no animal model of this tumor type exists. Herein, we describe spontaneous gonadotroph cell adenomas in old male and female Sprague-Dawley rats by histology, immunocytology and electron microscopy.The material consisted of the pituitaries of 27 male and 38 female Sprague Dawley rats, all 26 months of age or older, removed at routine autopsy. Sections of formal in-fixed, paraffin-embedded tissue were stained with hematoxylin-phloxine-saffron (HPS), the PAS method and the Gordon-Sweet technique for the demonstration of reticulin fibers. For immunostaining, sections were exposed to anti-rat β-LH, anti-ratβ-TSH, anti-rat PRL, anti-rat GH and anti-rat ACTH 1-39. For electron microscopy, tissue was fixed in 2.5% glutaraldehyde, postfixed in 1% OsO4 and embedded in epoxy-resin. Tissue fixed in 10% formalin, embedded in epoxy resin without osmification, was used for immunoelectron microscopy.

Electron Microscopic Detection and Characterization of Nonhuman Primate Enteric Viruses

1982 ◽  
Vol 40 ◽  
pp. 306-307
Author(s):  
G. C. Smith ◽  
R. L. Heberling ◽  
S. S. Kalter
Keyword(s):  
Electron Microscopy ◽  
Animal Model ◽  
Nonhuman Primate ◽  
Clinical Condition ◽  
Intestinal Tract ◽  
Enteric Viruses ◽  
Electron Microscopic ◽  
Microscopic Detection

A number of viral agents are recognized as and suspected of causing the clinical condition “gastroenteritis.” In our attempts to establish an animal model for studies of this entity, we have been examining the nonhuman primate to ascertain what viruses may be found in the intestinal tract of “normal” animals as well as animals with diarrhea. Several virus types including coronavirus, adenovirus, herpesvirus, and picornavirus (Table I) were detected in our colony; however, rotavirus, astrovirus, and calicivirus have not yet been observed. Fecal specimens were prepared for electron microscopy by procedures reported previously.

Neurofilaments and Paired Helical Filaments

1985 ◽  
Vol 43 ◽  
pp. 740-743
Author(s):  
J. Metuzals
Keyword(s):  
Animal Model ◽  
Posttranslational Modifications ◽  
Posttranslational Modification ◽  
Giant Axon ◽  
Paired Helical Filaments ◽  
Squid Giant Axon ◽  
In Vitro Experiments ◽  
Thin Sections ◽  
Structural Relationships

It has been demonstrated that the neurofibrillary tangles in biopsies of Alzheimer patients, composed of typical paired helical filaments (PHF), consist also of typical neurofilaments (NF) and 15nm wide filaments. Close structural relationships, and even continuity between NF and PHF, have been observed. In this paper, such relationships are investigated from the standpoint that the PHF are formed through posttranslational modifications of NF. To investigate the validity of the posttranslational modification hypothesis of PHF formation, we have identified in thin sections from frontal lobe biopsies of Alzheimer patients all existing conformations of NF and PHF and ordered these conformations in a hypothetical sequence. However, only experiments with animal model preparations will prove or disprove the validity of the interpretations of static structural observations made on patients. For this purpose, the results of in vitro experiments with the squid giant axon preparations are compared with those obtained from human patients. This approach is essential in discovering etiological factors of Alzheimer's disease and its early diagnosis.

Membrane-associated microtubular areays induced in proximal myelinated processes of dorsal root ganglia by large doses of vitamin B6

1986 ◽  
Vol 44 ◽  
pp. 368-369
Author(s):  
V.J. Montpetit ◽  
S. Dancea ◽  
L. Tryphonas ◽  
D.F. Clapin
Keyword(s):  
Animal Model ◽  
Endoplasmic Reticulum ◽  
Dorsal Root Ganglia ◽  
Rough Endoplasmic Reticulum ◽  
Dorsal Root ◽  
Vitamin B6 ◽  
Morphological Changes ◽  
Model System ◽  
Sensory Nerves ◽  
Peripheral Sensory

Very large doses of pyridoxine (vitamin B6) are neurotoxic in humans, selectively affecting the peripheral sensory nerves. We have undertaken a study of the morphological and biochemical aspects of pyridoxine neurotoxicity in an animal model system. Early morphological changes in dorsal root ganglia (DRG) associated with pyridoxine megadoses include proliferation of neurofilaments, ribosomes, rough endoplasmic reticulum, and Golgi complexes. We present in this report evidence of the formation of unique aggregates of microtubules and membranes in the proximal processes of DRG which are induced by high levels of pyridoxine.

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