Regulation of heat shock protein 70 release in astrocytes: role of signaling kinases.

Regulation of heat shock protein 70 release in astrocytes: role of signaling kinases. Research Abstract Details 

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Regulation of heat shock protein 70 release in astrocytes: role of signaling kinases. Abstract Text:

Anna R Taylor,Mac B Robinson,David J Gifondorwa,Michael Tytell,Carolanne E Milligan,Anna R Taylor,Mac B Robinson,David J Gifondorwa,Michael Tytell,Carolanne E Milligan,

The ability to mount a successful stress response in the face of injury is critical to the long-term viability of individual cells and to the organism in general. The stress response, characterized in part by the upregulation of heat shock proteins, is compromised in several neurodegenerative disorders and in some neuronal populations, including motoneurons (MNs). Because astrocytes have a greater capacity than neurons to survive metabolic stress, and because they are intimately associated with the regulation of neuronal function, it is important to understand their stress response, so that we may to better appreciate the impact of stress on neuronal viability during injury or disease. We show that astrocytes subjected to hyperthermia upregulate Hsp/c70 in addition to intracellular signaling components including activated forms of extracellular-signal-regulated kinase (ERK1/2), Akt, and c-jun N-terminal kinase/stress activated protein kinase (JNK/SAPK). Furthermore, astrocytes release increasing amounts of Hsp/c70 into the extracellular environment following stress, an event that is abrogated when signaling through the ERK1/2 and phosphatidylinositol-3 kinase (PI3K) pathways is compromised and enhanced by inhibition of the JNK pathway. Last, we show that the Hsp/c70 is released from astrocytes in exosomes. Together, these data illustrate the diverse regulation of stress-induced Hsp/c70 release in exosomes, and the way in which the balance of activated signal transduction pathways affects this release. These data highlight how stressful insults can alter the microenvironment of an astrocyte, which may ultimately have implications for the survival of neighboring neurons.

Regulation of heat shock protein 70 release in astrocytes: role of signaling kinases. Publishing Authors By Initials

AR Taylor,MB Robinson,DJ Gifondorwa,M Tytell,CE Milligan,AR Taylor,MB Robinson,DJ Gifondorwa,M Tytell,CE Milligan,

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Regulation of heat shock protein 70 release in astrocytes: role of signaling kinases. Journal Published:

PUBLICATION TYPE: Research Support, Non-U.S. Gov

Journal: Developmental neurobiology

VOLUME: 67

Page Numbers: 1815-29

Journal Abbreviation: Dev Neurobiol

ISSN: 1932-8451

DAY: 17

MONTH: Nov

YEAR: 2007

Regulation of heat shock protein 70 release in astrocytes: role of signaling kinases. Information

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LANGUAGE: eng

NlmUniqueID: 101300215

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Grant and Affiliation Information for Regulation of heat shock protein 70 release in astrocytes: role of signaling kinases.

AFFILIATION: Department of Neurobiology and Anatomy, Wake Forest University School of Medicine, Winston-Salem, North Carolina 27157, USA.

Country: United States

AGENCY: United States NINDS

GRANT: NS046615

ACRONYM: NS

MEDLINETA: Dev Neurobiol

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