Inhibition of insulin-like growth factor I activity contributes to the premature apoptosis of cerebellar granule neuron in weaver mutant mice: In vitro analysis

Jin Zhong, Jixian Deng, Bernardino Ghetti, Wei Hua Lee

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Abstract

Evidence from transgenic mice and cultured cerebellar neurons supports an important role for insulin-like growth factor I (IGF-I) in the formation of cerebellar cytoarchitecture. To understand IGF-I's function during cerebellar development, we examined the involvement of IGF-I in the premature apoptosis of granule neurons derived from the cerebella of weaver (wv) mutant mice. Before their demise, wv granule neurons increased the expression and secretion of IGFBP5 in a gene dose-dependent manner. Because IGFBP5 may interfere with the interaction of IGF-I and its receptor, the abnormally high IGFBP5 levels in wv granule neurons suggest that a lack of IGF-I activation may contribute to their premature apoptosis. This hypothesis is supported by a gene dose-dependent decrease in IGF-I receptor (IGF-IR) phosphorylation. More importantly, there is a parallel gene dose-dependent decrease in Akt activity, which was inversely correlated with the activity levels of caspase 3. On the other hand, adding IGFBP5 antibody into culture media increased the survival of wv granule neurons, whereas adding IGFBP5 decreased the survival of wild-type granule neurons. To delineate the interaction between IGF-I and IGFBP5 on wv granule neurons, we examined neuronal survival after treating with IGF-I, des(1-3) IGF-I, or IGFBP5 antibody, At the same concentration, des(1-3) IGF-I was more effective than IGF-I in promoting survival, in increasing Akt activity, and in decreasing caspase 3 activity. These results indicate that IGF-I's actions on wv granule neurons are normally inhibited by excess IGFBP5, and sufficient IGF-I receptor activation rescues wv granule neurons via stimulating the Akt signaling pathway.

Original languageEnglish
Pages (from-to)36-45
Number of pages10
JournalJournal of Neuroscience Research
Volume70
Issue number1
DOIs
StatePublished - Oct 1 2002

Fingerprint

Neurologic Mutant Mice
Insulin-Like Growth Factor I
Apoptosis
Neurons
IGF Type 1 Receptor
Caspase 3
Genes
In Vitro Techniques
Antibodies
Cerebellum
Transgenic Mice
Culture Media
Phosphorylation

Keywords

  • Apoptosis
  • Caspase 3
  • Insulin-like growth factor I
  • PI3/Akt
  • Weaver mice

ASJC Scopus subject areas

  • Neuroscience(all)

Cite this

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title = "Inhibition of insulin-like growth factor I activity contributes to the premature apoptosis of cerebellar granule neuron in weaver mutant mice: In vitro analysis",
abstract = "Evidence from transgenic mice and cultured cerebellar neurons supports an important role for insulin-like growth factor I (IGF-I) in the formation of cerebellar cytoarchitecture. To understand IGF-I's function during cerebellar development, we examined the involvement of IGF-I in the premature apoptosis of granule neurons derived from the cerebella of weaver (wv) mutant mice. Before their demise, wv granule neurons increased the expression and secretion of IGFBP5 in a gene dose-dependent manner. Because IGFBP5 may interfere with the interaction of IGF-I and its receptor, the abnormally high IGFBP5 levels in wv granule neurons suggest that a lack of IGF-I activation may contribute to their premature apoptosis. This hypothesis is supported by a gene dose-dependent decrease in IGF-I receptor (IGF-IR) phosphorylation. More importantly, there is a parallel gene dose-dependent decrease in Akt activity, which was inversely correlated with the activity levels of caspase 3. On the other hand, adding IGFBP5 antibody into culture media increased the survival of wv granule neurons, whereas adding IGFBP5 decreased the survival of wild-type granule neurons. To delineate the interaction between IGF-I and IGFBP5 on wv granule neurons, we examined neuronal survival after treating with IGF-I, des(1-3) IGF-I, or IGFBP5 antibody, At the same concentration, des(1-3) IGF-I was more effective than IGF-I in promoting survival, in increasing Akt activity, and in decreasing caspase 3 activity. These results indicate that IGF-I's actions on wv granule neurons are normally inhibited by excess IGFBP5, and sufficient IGF-I receptor activation rescues wv granule neurons via stimulating the Akt signaling pathway.",
keywords = "Apoptosis, Caspase 3, Insulin-like growth factor I, PI3/Akt, Weaver mice",
author = "Jin Zhong and Jixian Deng and Bernardino Ghetti and Lee, {Wei Hua}",
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T1 - Inhibition of insulin-like growth factor I activity contributes to the premature apoptosis of cerebellar granule neuron in weaver mutant mice

T2 - In vitro analysis

AU - Zhong, Jin

AU - Deng, Jixian

AU - Ghetti, Bernardino

AU - Lee, Wei Hua

PY - 2002/10/1

Y1 - 2002/10/1

N2 - Evidence from transgenic mice and cultured cerebellar neurons supports an important role for insulin-like growth factor I (IGF-I) in the formation of cerebellar cytoarchitecture. To understand IGF-I's function during cerebellar development, we examined the involvement of IGF-I in the premature apoptosis of granule neurons derived from the cerebella of weaver (wv) mutant mice. Before their demise, wv granule neurons increased the expression and secretion of IGFBP5 in a gene dose-dependent manner. Because IGFBP5 may interfere with the interaction of IGF-I and its receptor, the abnormally high IGFBP5 levels in wv granule neurons suggest that a lack of IGF-I activation may contribute to their premature apoptosis. This hypothesis is supported by a gene dose-dependent decrease in IGF-I receptor (IGF-IR) phosphorylation. More importantly, there is a parallel gene dose-dependent decrease in Akt activity, which was inversely correlated with the activity levels of caspase 3. On the other hand, adding IGFBP5 antibody into culture media increased the survival of wv granule neurons, whereas adding IGFBP5 decreased the survival of wild-type granule neurons. To delineate the interaction between IGF-I and IGFBP5 on wv granule neurons, we examined neuronal survival after treating with IGF-I, des(1-3) IGF-I, or IGFBP5 antibody, At the same concentration, des(1-3) IGF-I was more effective than IGF-I in promoting survival, in increasing Akt activity, and in decreasing caspase 3 activity. These results indicate that IGF-I's actions on wv granule neurons are normally inhibited by excess IGFBP5, and sufficient IGF-I receptor activation rescues wv granule neurons via stimulating the Akt signaling pathway.

AB - Evidence from transgenic mice and cultured cerebellar neurons supports an important role for insulin-like growth factor I (IGF-I) in the formation of cerebellar cytoarchitecture. To understand IGF-I's function during cerebellar development, we examined the involvement of IGF-I in the premature apoptosis of granule neurons derived from the cerebella of weaver (wv) mutant mice. Before their demise, wv granule neurons increased the expression and secretion of IGFBP5 in a gene dose-dependent manner. Because IGFBP5 may interfere with the interaction of IGF-I and its receptor, the abnormally high IGFBP5 levels in wv granule neurons suggest that a lack of IGF-I activation may contribute to their premature apoptosis. This hypothesis is supported by a gene dose-dependent decrease in IGF-I receptor (IGF-IR) phosphorylation. More importantly, there is a parallel gene dose-dependent decrease in Akt activity, which was inversely correlated with the activity levels of caspase 3. On the other hand, adding IGFBP5 antibody into culture media increased the survival of wv granule neurons, whereas adding IGFBP5 decreased the survival of wild-type granule neurons. To delineate the interaction between IGF-I and IGFBP5 on wv granule neurons, we examined neuronal survival after treating with IGF-I, des(1-3) IGF-I, or IGFBP5 antibody, At the same concentration, des(1-3) IGF-I was more effective than IGF-I in promoting survival, in increasing Akt activity, and in decreasing caspase 3 activity. These results indicate that IGF-I's actions on wv granule neurons are normally inhibited by excess IGFBP5, and sufficient IGF-I receptor activation rescues wv granule neurons via stimulating the Akt signaling pathway.

KW - Apoptosis

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KW - PI3/Akt

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