Abstract
Oncogenic variants of the receptor tyrosine kinase, Ret, cause formation of tumors of neuroendocrine derivation in the multiple endocrine neoplasia type 2 and, thus, likely interfere with antiproliferative and/or differentiative extracellular signals. Here we took advantage of two rat pheochromocytoma-derived cell lines (PC12/MEN2A and PC12/MEN2B) to investigate whether Ret-induced nerve growth factor (NGF) unresponsiveness might involve impairment of ERK signaling. In fact, these cells, stably transfected with distinct forms of the active ret oncogene, fail to block proliferation, even upon NGF stimulation. In these cells we show the presence of both chronic ERKs activity and high expression levels of MKP-3, an ERK- specific phosphatase. Despite the presence of MKP-3, ERK activity can be further stimulated by NGF, but it fails to translocate into the nucleus and consequently to induce immediate-early gene transcription. Because of the presence of MKP-3, our results suggest the existence of a negative regulatory feedback acting on ERKs as a mechanism responsible for the abrogation of NGF- induced terminal differentiation. Indeed, MKP-3 seems to be implicated in the persistence of ERKs in cell cytoplasm. This interpretation is further supported by the observation that in ret-transfected cells, forced expression of an active form of MEK-1 may overcome this block; it restores transcription from the c-fos promoter, induces translocation of ERKs into the nucleus, and inhibits cell proliferation.
| Original language | English |
|---|---|
| Pages (from-to) | 19306-19314 |
| Number of pages | 9 |
| Journal | Journal of Biological Chemistry |
| Volume | 275 |
| Issue number | 25 |
| DOIs | |
| Publication status | Published - Jun 23 2000 |
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ASJC Scopus subject areas
- Biochemistry
Cite this
Abrogation of nerve growth factor-induced terminal differentiation by ret oncogene involves perturbation of nuclear translocation of ERK. / Colucci-D'Amato, G. Luca; D'Alessio, Amelia; Califano, Daniela; Calì, Gaetano; Rizzo, Claudia; Nitsch, Lucio; Santelli, Giovanni; De Franciscis, Vittorio.
In: Journal of Biological Chemistry, Vol. 275, No. 25, 23.06.2000, p. 19306-19314.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Abrogation of nerve growth factor-induced terminal differentiation by ret oncogene involves perturbation of nuclear translocation of ERK
AU - Colucci-D'Amato, G. Luca
AU - D'Alessio, Amelia
AU - Califano, Daniela
AU - Calì, Gaetano
AU - Rizzo, Claudia
AU - Nitsch, Lucio
AU - Santelli, Giovanni
AU - De Franciscis, Vittorio
PY - 2000/6/23
Y1 - 2000/6/23
N2 - Oncogenic variants of the receptor tyrosine kinase, Ret, cause formation of tumors of neuroendocrine derivation in the multiple endocrine neoplasia type 2 and, thus, likely interfere with antiproliferative and/or differentiative extracellular signals. Here we took advantage of two rat pheochromocytoma-derived cell lines (PC12/MEN2A and PC12/MEN2B) to investigate whether Ret-induced nerve growth factor (NGF) unresponsiveness might involve impairment of ERK signaling. In fact, these cells, stably transfected with distinct forms of the active ret oncogene, fail to block proliferation, even upon NGF stimulation. In these cells we show the presence of both chronic ERKs activity and high expression levels of MKP-3, an ERK- specific phosphatase. Despite the presence of MKP-3, ERK activity can be further stimulated by NGF, but it fails to translocate into the nucleus and consequently to induce immediate-early gene transcription. Because of the presence of MKP-3, our results suggest the existence of a negative regulatory feedback acting on ERKs as a mechanism responsible for the abrogation of NGF- induced terminal differentiation. Indeed, MKP-3 seems to be implicated in the persistence of ERKs in cell cytoplasm. This interpretation is further supported by the observation that in ret-transfected cells, forced expression of an active form of MEK-1 may overcome this block; it restores transcription from the c-fos promoter, induces translocation of ERKs into the nucleus, and inhibits cell proliferation.
AB - Oncogenic variants of the receptor tyrosine kinase, Ret, cause formation of tumors of neuroendocrine derivation in the multiple endocrine neoplasia type 2 and, thus, likely interfere with antiproliferative and/or differentiative extracellular signals. Here we took advantage of two rat pheochromocytoma-derived cell lines (PC12/MEN2A and PC12/MEN2B) to investigate whether Ret-induced nerve growth factor (NGF) unresponsiveness might involve impairment of ERK signaling. In fact, these cells, stably transfected with distinct forms of the active ret oncogene, fail to block proliferation, even upon NGF stimulation. In these cells we show the presence of both chronic ERKs activity and high expression levels of MKP-3, an ERK- specific phosphatase. Despite the presence of MKP-3, ERK activity can be further stimulated by NGF, but it fails to translocate into the nucleus and consequently to induce immediate-early gene transcription. Because of the presence of MKP-3, our results suggest the existence of a negative regulatory feedback acting on ERKs as a mechanism responsible for the abrogation of NGF- induced terminal differentiation. Indeed, MKP-3 seems to be implicated in the persistence of ERKs in cell cytoplasm. This interpretation is further supported by the observation that in ret-transfected cells, forced expression of an active form of MEK-1 may overcome this block; it restores transcription from the c-fos promoter, induces translocation of ERKs into the nucleus, and inhibits cell proliferation.
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UR - http://www.scopus.com/inward/citedby.url?scp=0034705479&partnerID=8YFLogxK
U2 - 10.1074/jbc.275.25.19306
DO - 10.1074/jbc.275.25.19306
M3 - Article
VL - 275
SP - 19306
EP - 19314
JO - Journal of Biological Chemistry
JF - Journal of Biological Chemistry
SN - 0021-9258
IS - 25
ER -