منابع مشابه
Sleep: Switching Off the Off-Switch
What are the synaptic drives controlling the sleep-wake circuitry in the mammalian brain? In a new study it was found that GABAergic cells in posterior lateral hypothalamus inhibit sleep-promoting anterior hypothalamic cells to cause waking, whereas their inhibition augments sleep.
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Sometimes the elementary experiment can lead to the most surprising result. This was recently the case when we had to learn that so-called "photosynthetic slugs" survive just fine in the dark and with chemically inhibited photosynthesis. Sacoglossan sea slugs feed on large siphonaceous, often single-celled algae by ingesting their cytosolic content including the organelles. A few species of the...
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In hematopoietic cells, the protein tyrosine phosphatase PTP1C appears to play a central role in the termination of signalling by receptors that activate protein tyrosine kinases.
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Schwann cells are remarkably plastic cells that can both form and stably maintain myelin sheaths around axons and also rapidly dedifferentiate upon injury. New findings (Parkinson, D.B., A. Bhaskaran, P. Arthur-Farraj, L.A. Noon, A. Woodhoo, A.C. Lloyd, M.L. Feltri, L. Wrabetz, A. Behrens, R. Mirsky, and K.R. Jessen. 2008. J. Cell Biol. 181:625-637) indicate that the transition between these di...
متن کاملSwitching immune signals on and off
Bruton's tyrosine kinase, an enzyme that is important for B cell function, can be activated in a number of ways. Bruton's tyrosine kinase (Btk) and activation by soluble inositol hexakisphosphate. eLife 4:e06074. Image The enzyme Btk has crucial roles in tyrosine kinase signaling and the development of certain immune cells B cells are immune cells that protect the body against pathogens by maki...
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ژورنال
عنوان ژورنال: BMJ
سال: 1977
ISSN: 0959-8138,1468-5833
DOI: 10.1136/bmj.2.6096.1223