Expression of neuropeptide processing enzymes and neurosecretory proteins in ependyma and choroid plexus epithelium

1993 ◽  
Vol 617 (2) ◽  
pp. 238-248 ◽  
Author(s):  
Patricia Gee ◽  
C. Harker Rhodes ◽  
Lloyd D. Fricker ◽  
Ruth Hogue Angeletti
Keyword(s):  
Choroid Plexus ◽  
Choroid Plexus Epithelium ◽  
Processing Enzymes

Organization of tight junctions in the choroid plexus epithelium

1978 ◽  
Vol 36 (2) ◽  
pp. 336-337
Author(s):  
B. Van Deurs ◽  
J. K. Koehler
Keyword(s):  
Choroid Plexus ◽  
Present Report ◽  
Freeze Fracture ◽  
Barrier Properties ◽  
Cell Junctions ◽  
Structural Basis ◽  
Apical Surface ◽  
Choroid Plexus Epithelium ◽  
Solid Nitrogen ◽  
Special Composition

The choroid plexus epithelium constitutes a blood-cerebrospinal fluid (CSF) barrier, and is involved in regulation of the special composition of the CSF. The epithelium is provided with an ouabain-sensitive Na/K-pump located at the apical surface, actively pumping ions into the CSF. The choroid plexus epithelium has been described as “leaky” with a low transepithelial resistance, and a passive transepithelial flux following a paracellular route (intercellular spaces and cell junctions) also takes place. The present report describes the structural basis for these “barrier” properties of the choroid plexus epithelium as revealed by freeze fracture.Choroid plexus from the lateral, third and fourth ventricles of rats were used. The tissue was fixed in glutaraldehyde and stored in 30% glycerol. Freezing was performed either in liquid nitrogen-cooled Freon 22, or directly in a mixture of liquid and solid nitrogen prepared in a special vacuum chamber. The latter method was always used, and considered necessary, when preparations of complementary (double) replicas were made.

scholarly journals T-Lymphocytes Traffic into the Brain across the Blood-CSF Barrier: Evidence Using a Reconstituted Choroid Plexus Epithelium

PLoS ONE ◽  
2016 ◽  
Vol 11 (3) ◽  
pp. e0150945 ◽  
Author(s):  
Nathalie Strazielle ◽  
Rita Creidy ◽  
Christophe Malcus ◽  
José Boucraut ◽  
Jean-François Ghersi-Egea
Keyword(s):  
T Lymphocytes ◽  
Choroid Plexus ◽  
Choroid Plexus Epithelium ◽  
The Brain

Immunoreactivities for hepcidin, ferroportin, and hephaestin in astrocytes and choroid plexus epithelium of human brains

2019 ◽  
Vol 40 (1) ◽  
pp. 75-83 ◽  
Author(s):  
Ken Yanase ◽  
Naoya Uemura ◽  
Yoichi Chiba ◽  
Ryuta Murakami ◽  
Ryuji Fujihara ◽  
...  
Keyword(s):  
Choroid Plexus ◽  
Choroid Plexus Epithelium ◽  
Human Brains

Altered pHi regulation and Na+/HCO3− transporter activity in choroid plexus of cilia-defective Tg737orpk mutant mouse

2007 ◽  
Vol 292 (4) ◽  
pp. C1409-C1416 ◽  
Author(s):  
Boglarka Banizs ◽  
Peter Komlosi ◽  
Mark O. Bevensee ◽  
Erik M. Schwiebert ◽  
Phillip D. Bell ◽  
...  
Keyword(s):  
Ion Transport ◽  
Choroid Plexus ◽  
Perinatal Period ◽  
Ependymal Cells ◽  
Intracellular Camp ◽  
Transport Activity ◽  
Wild Type ◽  
Choroid Plexus Epithelium ◽  
Fluid Movement ◽  
Camp Levels

Tg737 orpk mice have defects in cilia assembly and develop hydrocephalus in the perinatal period of life. Hydrocephalus is progressive and is thought to be initiated by abnormal ion and water transport across the choroid plexus epithelium. The pathology is further aggravated by the slow and disorganized beating of motile cilia on ependymal cells that contribute to decreased cerebrospinal fluid movement through the ventricles. Previously, we demonstrated that the hydrocephalus phenotype is associated with a marked increase in intracellular cAMP levels in choroid plexus epithelium, which is known to have regulatory effects on ion and fluid movement in many secretory epithelia. To evaluate whether the hydrocephalus in Tg737 orpk mutants is associated with defects in ion transport, we compared the steady-state pHi and Na+-dependent transport activities of isolated choroid plexus epithelium tissue from Tg737 orpk mutant and wild-type mice. The data indicate that Tg737 orpk mutant choroid plexus epithelium have lower pHi and higher Na+-dependent HCO3− transport activity compared with wild-type choroid plexus epithelium. In addition, wild-type choroid plexus epithelium could be converted to a mutant phenotype with regard to the activity of Na+-dependent HCO3− transport by addition of dibutyryl-cAMP and mutant choroid plexus epithelium toward the wild-type phenotype by inhibiting PKA activity with H-89. Together, these data suggest that cilia have an important role in regulating normal physiology of choroid plexus epithelium and that ciliary dysfunction in Tg737 orpk mutants disrupts a signaling pathway leading to elevated intracellular cAMP levels and aberrant regulation of pHi and ion transport activity.

Cerebral Malignant Tumors with Ependymal and Choroidal Differentiation in Two Siblings

Neurosurgery ◽  
1988 ◽  
Vol 22 (5) ◽  
pp. 928-933 ◽  
Author(s):  
David G. Munoz ◽  
Robert Griebel ◽  
Bohdan Rozdilsky ◽  
David George
Keyword(s):  
Choroid Plexus ◽  
Posterior Fossa ◽  
Cerebral Hemisphere ◽  
Malignant Tumors ◽  
Rare Tumor ◽  
Choroid Plexus Epithelium ◽  
Left Cerebral Hemisphere ◽  
Inherited Predisposition ◽  
History Of ◽  
Immunocytochemical Studies

Abstract Two siblings in a family without a history of phacomatosis or cerebral tumors developed malignant tumors in the posterior fossa at age 28 months and in the left cerebral hemisphere at age 15 months, respectively. Dual ependymal and choroid plexus epithelium differentiation was established by histological, ultrastructural, and immunocytochemical studies. The development of this rare tumor in siblings suggests an inherited predisposition, a common environmental insult, or both.

NADPH diaphorase activity is inhibited by EDTA in neurons but not in choroid plexus epithelium

1993 ◽  
Vol 158 (1) ◽  
pp. 101-104 ◽  
Author(s):  
Giuseppe Sancesario ◽  
Maria Morello ◽  
Roberto Massa ◽  
Francesca Fusco ◽  
Giorgio Bernardi
Keyword(s):  
Choroid Plexus ◽  
Nadph Diaphorase ◽  
Choroid Plexus Epithelium ◽  
Diaphorase Activity
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