Volume 166, Issue 2 pp. 323-331
Full Access

Insulin-like growth factor I rescues SH-SY5Y human neuroblastoma cells from hyperosmotic induced programmed cell death

Christopher C. Matthews

Christopher C. Matthews

Department of Neurology and Neurosciences Program, University of Michigan, Ann Arbor, Michigan 48109

Search for more papers by this author
Eva L. Feldman

Corresponding Author

Eva L. Feldman

Department of Neurology and Neurosciences Program, University of Michigan, Ann Arbor, Michigan 48109

University of Michigan, Department of Neurology, 200 Zina Pitcher Place, 4414 Kresge III, Ann Arbor, MI 48109-0588Search for more papers by this author

Abstract

Insulin-like growth factor I (IGF-I) and the type I IGF receptor are widely distributed in developing and adult mammalian nervous systems. In vitro, IGF-I is a mitogen for primary neurons and also for cells from the SH-SY5Y human neuroblastoma cell line, a well-characterized model system of neuronal growth. In the current study, we examined the effects of osmotic stress on SH-SY5Y cell viability and the mechanism by which IGF-I serves as a neuronal osmoprotectant. Within 24 hr, exposure of SH-SY5Y cells to hyperosmotic serum-free media decreased (1) the number of viable cells, (2) the rate of 3H-thymidine incorporation, and (3) cell cycle progression. The inclusion of 10 nM IGF-I with hyperosmotic media prevented the loss of cell viability. The osmoprotective effects of IGF-I were inhibited by α-IRJ, a blocking antibody of the type I IGF receptor. The observed loss of SH-SY5Y cell viability following hyperosmotic shock was due to an induction of programmed cell death as determined by flow cytometry and gel electrophoresis. Our results suggest that IGF-I can protect SH-SY5Y cells from hyperosmotic induced programmed cell death. © 1996 Wiley-Liss, Inc.

The full text of this article hosted at iucr.org is unavailable due to technical difficulties.