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The Journal of Neuroscience, June 15, 2003, 23(12):5141-5148

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Regulation of Natural Cell Death in Dopaminergic Neurons of the Substantia Nigra by Striatal Glial Cell Line-Derived Neurotrophic Factor In Vivo

Tinmarla Frances Oo,¹ Nikolai Kholodilov,¹ and Robert E. Burke^1,2

Departments of ¹Neurology and ²Pathology, The College of Physicians and Surgeons, Columbia University, New York, New York, 10032

Dopamine (DA) neurons of the substantia nigra undergo a developmental cell death event that is biphasic, with peaks just after birth and at postnatal day 14. As envisioned by neurotrophic theory, this cell death is likely to be regulated by target interactions because it is augmented by their disruption. However, the nature of the trophic molecules mediating this regulation are unknown. We showed in vitro that glial cell line-derived neurotrophic factor (GDNF) is able to suppress apoptotic death in DA neurons in postnatal primary culture. We now demonstrate in vivo that administration of GDNF into the striatal target is able to suppress apoptosis. Consistent with a possible physiologic role for endogenous striatal GDNF in regulating this event, two anti-GDNF neutralizing antibodies augment cell death. These antibodies augment cell death only during the first (immediately postnatal) phase of the biphasic death event. We conclude that GDNF is the leading candidate for a target-derived neurotrophic factor for the regulation of the early phase of natural cell death in DA neurons.

Key words: apoptosis; programmed cell death; neurotrophic factors; Parkinson's disease; striatum; substantia nigra

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Received Dec. 18, 2002; revised Mar. 21, 2003; accepted Mar. 24, 2003.

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