Expression levels of Rab2, a G protein, and Bag-1, a Bcl-2 binding protein are controlled by withdrawal of nicotine from cultured pheochromocytoma PC12 cells

Koji Yamada, H. Ishiguro, Naohiro Ichino, K. Nishii, H. Sawada, T. Hida, T. Nagatsu

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

We previously reported that nicotine withdrawal up-regulates transcription of some immediately early genes (IEGs), c-fos (Ichino et al., 1999) and egr1, nur77 (Ichino et al., 2002) in cultures of pheochromocytoma PC12 cells, which are of neuronal lineage. In the present study we aimed at further elucidating the effects of nicotine withdrawal on the expression of the genes downstream of IEGs. We examined the changes in the protein levels of 2 GTP-binding proteins, Rab2 (Ras-related protein) and Rac1. PC12 cells were cultured in the presence of nicotine for 24 hours, and then the nicotine was removed from the medium. The protein level of Rab2 was low in the presence of nicotine, but was rapidly increased after nicotine withdrawal. In contrast, that of Rac1 did not change after the withdrawal. Considering the neuroprotective effect of nicotine, we also examined the level of Bag-1 protein, which is a binding protein for Bcl-2, an anti-apoptotic factor, and found a slight increase in the gene expression of Bag-1 following nicotine withdrawal. Among 56-kDa, 50-kDa, and 36-kDa protein components of the Bag-1 protein complex, the levels of 56-kDa and 50-kDa proteins were not changed by the addition or withdrawal of nicotine; but the level of the 36-kDa protein, which had been increased in the presence of nicotine, was markedly decreased after nicotine withdrawal. The present results suggest that such changes may also occur in individuals during abstaining from smoking and be related to the withdrawal symptoms experienced after smokers stop smoking.

Original languageEnglish
Pages (from-to)633-639
Number of pages7
JournalJournal of Neural Transmission
Volume112
Issue number5
DOIs
Publication statusPublished - 01-05-2005

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PC12 Cells
Pheochromocytoma
Nicotine
GTP-Binding Proteins
Carrier Proteins
rab2 GTP-Binding Protein
Proteins
Smoking
fos Genes
Gene Expression
ras Proteins
Substance Withdrawal Syndrome
Neuroprotective Agents
Up-Regulation

All Science Journal Classification (ASJC) codes

  • Neurology
  • Clinical Neurology
  • Psychiatry and Mental health
  • Biological Psychiatry

Cite this

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title = "Expression levels of Rab2, a G protein, and Bag-1, a Bcl-2 binding protein are controlled by withdrawal of nicotine from cultured pheochromocytoma PC12 cells",
abstract = "We previously reported that nicotine withdrawal up-regulates transcription of some immediately early genes (IEGs), c-fos (Ichino et al., 1999) and egr1, nur77 (Ichino et al., 2002) in cultures of pheochromocytoma PC12 cells, which are of neuronal lineage. In the present study we aimed at further elucidating the effects of nicotine withdrawal on the expression of the genes downstream of IEGs. We examined the changes in the protein levels of 2 GTP-binding proteins, Rab2 (Ras-related protein) and Rac1. PC12 cells were cultured in the presence of nicotine for 24 hours, and then the nicotine was removed from the medium. The protein level of Rab2 was low in the presence of nicotine, but was rapidly increased after nicotine withdrawal. In contrast, that of Rac1 did not change after the withdrawal. Considering the neuroprotective effect of nicotine, we also examined the level of Bag-1 protein, which is a binding protein for Bcl-2, an anti-apoptotic factor, and found a slight increase in the gene expression of Bag-1 following nicotine withdrawal. Among 56-kDa, 50-kDa, and 36-kDa protein components of the Bag-1 protein complex, the levels of 56-kDa and 50-kDa proteins were not changed by the addition or withdrawal of nicotine; but the level of the 36-kDa protein, which had been increased in the presence of nicotine, was markedly decreased after nicotine withdrawal. The present results suggest that such changes may also occur in individuals during abstaining from smoking and be related to the withdrawal symptoms experienced after smokers stop smoking.",
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Expression levels of Rab2, a G protein, and Bag-1, a Bcl-2 binding protein are controlled by withdrawal of nicotine from cultured pheochromocytoma PC12 cells. / Yamada, Koji; Ishiguro, H.; Ichino, Naohiro; Nishii, K.; Sawada, H.; Hida, T.; Nagatsu, T.

In: Journal of Neural Transmission, Vol. 112, No. 5, 01.05.2005, p. 633-639.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Expression levels of Rab2, a G protein, and Bag-1, a Bcl-2 binding protein are controlled by withdrawal of nicotine from cultured pheochromocytoma PC12 cells

AU - Yamada, Koji

AU - Ishiguro, H.

AU - Ichino, Naohiro

AU - Nishii, K.

AU - Sawada, H.

AU - Hida, T.

AU - Nagatsu, T.

PY - 2005/5/1

Y1 - 2005/5/1

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