IGF-1 Acts As Controlling Switch for Long-term Proliferation and Maintenance of EGF/FGF-responsive Striatal Neural Stem Cells

Overview

Journal Int J Med Sci

Specialty General Medicine

Date 2013 Mar 28

PMID 23532711

Citations 27

Authors

Nor Entan Supeno

Soumya Pati

Raisah Abdul Hadi

Abdul Rahman Izani Ghani

Zulkifli Mustafa

Jafri M Abdullah

Fauziah Mohamad Idris

Xu Han

Hasnan Jaafar

Affiliations

Soon will be listed here.

Abstract

Background: Long-term maintenance of neural stem cells in vitro is crucial for their stage specific roles in neurogenesis. To have an in-depth understanding of optimal conditional microenvironmental niche for long-term maintenance of neural stem cells (NSCs), we imposed different combinatorial treatment of growth factors to EGF/FGF-responsive cells. We hypothesized, that IGF-1-treatment can provide an optimal niche for long-term maintenance and proliferation of EGF/FGF-responsive NSCs.

Objective: This study was performed to investigate the cellular morphology and growth of rat embryonic striatal tissue derived-NSCs in long-term culture under the influence of different combinatorial effects of certain growth factors, such as EGF, bFGF, LIF and IGF-1.

Methods: The NSCs were harvested and cultured from striatal tissue of 18 days old rat embryos. We have generated neurospheres from these NSCs and cultured them till passage 7 (28 days in vitro) under four different conditional microenvironments: (A) without growth factor, (B) EGF/bFGF, (C) EGF/bFGF/LIF, (D) EGF/bFGF/IGF-1 and (E) EGF/bFGF/LIF/IGF-1. Isolated NSCs were characterised by Immunoflouroscence for nestin expression. The cell growth and proliferation was evaluated at different time intervals (P1, P3, P5 & P7), assessing the metabolic activity based cell proliferation. Apoptosis was studied in each of these groups by In situ cell death assay.

Results: Our results demonstrated certain important findings relevant to long-term culture and maintenance of striatal NSC-derived neurospheres. This suggested that IGF-1 can induce enhanced cell proliferation during early stages of neurogenesis, impose long-term maintenance (up to passage 7) to cultured NSCs and enhance survival efficiency in vitro, in the presence of EGF and FGF.

Conclusions: Our findings support the hypothesis that the enforcement of IGF-1 treatment to the EGF/FGF-responsive NSCs, can lead to enhanced cell proliferation during early stages of neurogenesis, and an extended life span in vitro. This information will be beneficial for improving future therapeutic implication of NSCs, by addressing improved in vitro production of NSCs.

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