Is GFAP expressed in all astrocytes?
Numerous studies have demonstrated an increased amount of GFAP in reactive astrocytes in different types of lesions or in cultured astrocytes [4,5,6]. Secondly, it has become clear that not all astrocytes in vivo express GFAP, or only weakly so [6,7,8,9,10].
Do astrocytes express Sox10?
Our findings demonstrated that ectopic expression of Sox10 in astrocytes led to the expression of endogenous Sox10, Myrf and Olig2 in vitro. Expression of these key transcription factors was accompanied with supporting morphological changes.
What is the function of the astrocytes cells?
Astrocytes are the most numerous cell type within the central nervous system (CNS) and perform a variety of tasks, from axon guidance and synaptic support, to the control of the blood brain barrier and blood flow. To perform these roles, there is a great variety of astrocytes.
How do astrocytes conduct action potentials?
Unlike neurons, astrocytes do not generate action potentials, however, they are electrically dynamic cells with extensive electrophysiological heterogeneity and diversity. Astrocytes are hyperpolarized cells with low membrane resistance.
What are GFAP positive astrocytes?
GFAP (glial fibrillary acidic protein) is an intermediate filament protein that is commonly used as a classical marker for astrocytes in the central nervous system.
What is GFAP expression?
Glial fibrillary acidic protein (GFAP) is an intermediate filament protein that is expressed in glial cells (astrocytes) and increased GFAP immunoreactivity (or astrocytic activation) is usually viewed as an index of gliosis or a relatively slow-developing correlate of neural damage (Finch, 2003; Hausmann, 2003).
What does Olig2 stain for?
Olig2 (and Olig1) antibodies stain OPCs and mature oligodendrocytes. However, at least Olig2 is not exclusive to oligodendrocytes. Olig2 also stains a subset of astrocytes, although it is down-regulated postnatally with time such that by P21 in mice, that subset of astrocytes no longer expresses Olig2.
What do oligodendrocyte precursor cells do?
Oligodendrocyte precursor cells (OPCs) are abundant in the adult central nervous system, and have the capacity to regenerate oligodendrocytes and myelin.
How do astrocytes form the blood brain barrier?
Astrocytes are essential for the formation and maintenance of the BBB by providing secreted factors that lead to the adequate association between the cells of the BBB and the formation of strong tight junctions.
How do astrocytes help maintain ion balance?
Astrocytes possess potassium channels and thus are in position to regulate the levels of extracellular potassium. Through this regulation, astrocytes can also indirectly affect the levels of intracellular chloride ions in neurons.
What is the role of OLIG2 in the development of astrocytes?
Recent studies have found that Olig2 is expressed in developing astrocytes and plays a pivotal role in astrocyte development in the brain [ 7, 8, 9, 10 ]. These studies indicate that Olig2 acts as a multifaceted transcription factor for some specific cell type differentiation and maturation during neural development.
Is there an OLIG2 + astrocyte subtype in the CNS?
This study presents a comprehensive Olig2 expression pattern in the adult mouse CNS, and identifies a subtype of Olig2 + astrocytes that are regionally enriched in the brain and spinal cord. Wild-type, 5-month-old C57BL/6 mice were used for most of the experiments and analysis.
Is a transient Olig2 expression in developing astrocytes associated with progenitor expression?
A transient expression in developing astrocytes supports in vitro studies in which Olig2 expression was positively correlated with an immature astrocyte phenotype but negatively correlated with a fully mature phenotype ( Gabay et al., 2003) and partially inhibited GFAP transcription ( Fukuda et al., 2003) in neural progenitor cultures.
Where is OLIG2 expressed in the brain?
Olig2 was expressed in astrocytes as well as oligodendrocytes throughout the cortex, subcortical white matter, and striatum.