Results 261 to 270 of about 9,338,478 (297)

Regulation of aquaporin-4 expression in astrocytes

Molecular Brain Research, 2001
Aquaporin-4 (AQP4), a mercury-insensitive water channel protein, is abundant in the central nervous system and is localized in astrocytes and ependymal cells. AQP4 is speculated to maintain the homeostasis of intracellular and extracellular water in the brain, but little is known about the mechanism of induction of its expression.
K, Yoneda, N, Yamamoto, K, Asai, K, Sobue, Y, Fujita, M, Fujita, M, Mase, K, Yamada, M, Nakanishi, T, Tada, Y, Miura, T, Kato   +11 more
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Higher order structure of aquaporin-4

Neuroscience, 2010
Unlike other mammalian AQPs, multiple tetramers of AQP4 associate in the plasma membrane to form peculiar structures called Orthogonal Arrays of Particles (OAPs), that are observable by freeze-fracture electron microscopy (FFEM). However, FFEM cannot give information about the composition of OAPs of different sizes, and due to its technical complexity ...
NICCHIA, GRAZIA PAOLA, SVELTO, Maria, FRIGERI, Antonio, ROSSI A, MOLA MG, PISANI, FRANCESCO, STIGLIANO C, BASCO D, MASTROTOTARO M   +8 more
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CNS aquaporin-4 autoimmunity in children

Neurology, 2008
In adult patients, autoantibodies targeting the water channel aquaporin-4 (AQP4) are a biomarker for a spectrum of CNS inflammatory demyelinating disorders with predilection for optic nerves and spinal cord (neuromyelitis optica [NMO]). Here we describe the neurologic, serologic, and radiographic findings associated with CNS AQP4 autoimmunity in ...
A, McKeon, V A, Lennon, T, Lotze, S, Tenenbaum, J M, Ness, M, Rensel, N L, Kuntz, J P, Fryer, H, Homburger, J, Hunter, B G, Weinshenker, K, Krecke, C F, Lucchinetti, S J, Pittock   +13 more
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Neurological autoimmunity targeting aquaporin-4

Neuroscience, 2010
Neuromyelitis optica (NMO) is the first inflammatory autoimmune demyelinating disease of the CNS for which a specific tissue target molecule has been identified--the astrocytic water channel aquaporin-4 (AQP4). Immunological insights have propelled significant advances in understanding the clinical, radiologic and immunopathologic characteristics of ...
S R, Hinson, A, McKeon, V A, Lennon
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Aquaporin-4 astrocytopathy in Baló’s disease

Acta Neuropathologica, 2010
Baló's concentric sclerosis (BCS) is considered to be a rare variant of multiple sclerosis and characterized by alternating rings of demyelinated and preserved myelin layers. The mechanism underlying BCS remains to be elucidated. Recently, occurrence of concentric rings of Baló was described in the brainstem of a patient with neuromyelitis optica (NMO).
Takeshi, Matsuoka, Satoshi O, Suzuki, Toru, Iwaki, Takeshi, Tabira, Artemio T, Ordinario, Jun-ichi, Kira   +5 more
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Inhibition of Aquaporin 4 by antiepileptic drugs

Bioorganic & Medicinal Chemistry, 2009
The potential of antiepileptic drugs (AEDs) to inhibit the water transport properties of aquaporin 4 (AQP4) was investigated using a combination of in silico and in vitro screening methods. Virtual docking studies on 14 AEDs indicated a range of docking energies that spanned approximately 40 kcal/mol, where the most stabilized energies were consistent ...
Vincent J, Huber, Mika, Tsujita, Ingrid L, Kwee, Tsutomu, Nakada   +3 more
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Identification of arylsulfonamides as Aquaporin 4 inhibitors

Bioorganic & Medicinal Chemistry Letters, 2007
Carbonic anhydrase inhibitors AZA, EZA, and 4-acetamidobenzsulfonamide were found to inhibit human AQP4-M23 mediated water transport by 80%, 68%, and 23%, respectively, at 20 microM in an in vitro functional assay. AZA was found to have an IC50 against AQP4 of 0.9 microM. Phloretin was inactive under the same conditions.
Vincent J, Huber, Mika, Tsujita, Maya, Yamazaki, Kenji, Sakimura, Tsutomu, Nakada   +4 more
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Aquaporin-4, homeostasis, and neurologic disease

Neurology, 2007
Aquaporins constitute a family of water channels that regulate the transport of water in essentially all organs, including the kidney, gastrointestinal tract, secretory glands, inner ear, nervous system, and muscle.1–3 Because of his seminal discovery of aquaporins as the long-sought water channels,1 Peter Agre of Johns Hopkins University was awarded ...
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Hydrocephalus and Aquaporins: The Role of Aquaporin-4

2011
Aquaporins (AQPs) are membrane proteins that facilitate water and small solute movement in tissues. Hydrocephalus is the major central nervous system disorder associated with defective cerebrospinal fluid turnover. Aquaporin-4 (AQP4) is a water channel located mainly at the blood-brain barrier (BBB) and blood-cerebrospinal fluid (CSF) interfaces and is
A S, Filippidis, M Y S, Kalani, H L, Rekate   +2 more
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Heterotetrameric Composition of Aquaporin-4 Water Channels

Biochemistry, 1999
Aquaporin (AQP) water channel proteins are tetrameric assemblies of individually active approximately 30 kDa subunits. AQP4 is the predominant water channel protein in brain, but immunoblotting of native tissues has previously yielded multiple poorly resolved bands.
Agre, Peter, Nielsen, S, Christensen, B. M., Neely, JD   +3 more
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