Differential activation of phospholipases by mitogenic EGF and neurogenic PDGF in immortalized hippocampal stem cell lines

Jee Young Sung, Sang Yoon Lee, Do Sik Min, Tae Yeon Eom, Young Soo Ahn, Myung Un Choi, Yunhee Kim Kwon, Kwang Chul Chung

Research output: Contribution to journalArticle

33 Citations (Scopus)

Abstract

In several neuronal systems, nerve growth factor (NGF) and platelet-derived growth factor (PDGF) act as neurogenic agents, whereas epidermal growth factor (EGF) acts as a mitogenic agent. Hippocampal stem cell lines (HiB5) immortalized by the expression of a temperature-sensitive SV40 large T antigen also respond differentially to EGF and PDGF. While EGF treatment at the permissive temperature induces proliferation, the addition of PDGF induces differentiation at the non-permissive temperature. However, the mechanism responsible for these different cellular fates has not been clearly elucidated. In order to clarify possible critical signaling events leading to these distinct cellular outcomes, we examined whether either EGF or PDGF differentially induces the activation of phospholipases, such as phospholipase A2 (PLA2), C (PLC), or D (PLD). Although EGF stimulation did not induce phospholipases, PDGF caused a rapid and transient activation of PLC and PLD, but not PLA2. When the activation of PLC or PLD was blocked, the neurite outgrowth induced by PDGF was significantly inhibited. Although the activation of PLD occurred faster than PLC, blocking of PLD activity by transient expression of lipase-inactive mutants did not inhibit the induction of PLC activity by PDGF. These results suggest that the differential activation of phospholipases may play an important role in signal transduction by mitogenic EGF and neurotrophic PDGF in HiB5 neuronal hippocampal stem cells. In particular, the activation of phospholipase C and D may contribute to neuronal differentiation by neurogenic PDGF in the HiB5 cells.

Original languageEnglish
Pages (from-to)1044-1053
Number of pages10
JournalJournal of Neurochemistry
Volume78
Issue number5
DOIs
Publication statusPublished - 2001 Sep 17

Fingerprint

Phospholipases
Platelet-Derived Growth Factor
Stem cells
Epidermal Growth Factor
Stem Cells
Chemical activation
Cell Line
Programmable logic controllers
Phospholipase D
Phospholipases A2
Type C Phospholipases
Temperature
Polyomavirus Transforming Antigens
Viral Tumor Antigens
Signal transduction
Nerve Growth Factor
Lipase
Signal Transduction

All Science Journal Classification (ASJC) codes

  • Biochemistry
  • Cellular and Molecular Neuroscience

Cite this

Sung, Jee Young ; Lee, Sang Yoon ; Min, Do Sik ; Eom, Tae Yeon ; Ahn, Young Soo ; Choi, Myung Un ; Kwon, Yunhee Kim ; Chung, Kwang Chul. / Differential activation of phospholipases by mitogenic EGF and neurogenic PDGF in immortalized hippocampal stem cell lines. In: Journal of Neurochemistry. 2001 ; Vol. 78, No. 5. pp. 1044-1053.
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Differential activation of phospholipases by mitogenic EGF and neurogenic PDGF in immortalized hippocampal stem cell lines. / Sung, Jee Young; Lee, Sang Yoon; Min, Do Sik; Eom, Tae Yeon; Ahn, Young Soo; Choi, Myung Un; Kwon, Yunhee Kim; Chung, Kwang Chul.

In: Journal of Neurochemistry, Vol. 78, No. 5, 17.09.2001, p. 1044-1053.

Research output: Contribution to journalArticle

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AU - Sung, Jee Young

AU - Lee, Sang Yoon

AU - Min, Do Sik

AU - Eom, Tae Yeon

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AU - Kwon, Yunhee Kim

AU - Chung, Kwang Chul

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