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Cell density increases Bcl-2 and Bcl-x expression in addition to survival of cultured cerebellar granule neurons.

Abstract：

:The proto-oncogene bcl-2 and its family members, bcl-x and bax are recognized as major regulators of cell death and survival. Although Bcl-2 and Bcl-x are expressed in brain, little is known how they are regulated in neurons. Here we have studied the expression of bcl-2, bcl-xL and bax mRNA in rat cerebellar granule neurons cultured under conditions which influence neuron survival. Insulin-like growth factor-1 and brain-derived neurotrophic factor supported the survival of these neurons, but affected neither the expression of bcl-2, bcl-xL nor bax mRNA. In contrast, bcl-2 and bcl-xL mRNAs were up-regulated in cerebellar granule neurons plated at high density exhibiting an increased neuronal survival. Western blots showed that cell density also increased Bcl-2 protein level. However, conditioned medium from dense cultures did not affect the level of bcl-2 mRNA nor survival of the neurons. This suggests that cell density promotes survival and regulates Bcl-2 expression in cerebellar granule neurons through a signaling pathway different from known neurotrophic factors.

journal_name

Neuroscience

journal_title

Neuroscience

authors

Ohga Y,Zirrgiebel U,Hamnér S,Michaelidis TM,Cooper J,Thoenen H,Lindholm D

doi

10.1016/0306-4522(96)00204-7

subject

Has Abstract

pub_date

1996-08-01 00:00:00

pages

913-7

issue

4

eissn

0306-4522

issn

1873-7544

pii

0306-4522(96)00204-7

journal_volume

73

pub_type

杂志文章

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