Volume 18, Issue 10 pp. 2103-2116
Original Article
Open Access

Notch3 is necessary for neuronal differentiation and maturation in the adult spinal cord

Gabriel Rusanescu

Corresponding Author

Gabriel Rusanescu

MGH Center for Translational Pain Research, Department of Anesthesia, Critical Care and Pain Medicine, Massachusetts General Hospital, Charlestown, MA, USA

Correspondence to: Gabriel RUSANESCU,

MGH Center for Translational Pain Research,

Department of Anesthesia, Critical Care and Pain Medicine, Massachusetts General Hospital, 149 13th Street,

Charlestown, MA 02129, USA.

Tel.: 1-781-526-7412

Fax: 617-726 3441

E-mail: [email protected]

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Jianren Mao

Jianren Mao

MGH Center for Translational Pain Research, Department of Anesthesia, Critical Care and Pain Medicine, Massachusetts General Hospital, Charlestown, MA, USA

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First published: 28 August 2014
Citations: 28

Abstract

Notch receptors are key regulators of nervous system development and promoters of neural stem cells renewal and proliferation. Defects in the expression of Notch genes result in severe, often lethal developmental abnormalities. Notch3 is generally thought to have a similar proliferative, anti-differentiation and gliogenic role to Notch1. However, in some cases, Notch3 has an opposite, pro-differentiation effect. Here, we show that Notch3 segregates from Notch1 and is transiently expressed in adult rat and mouse spinal cord neuron precursors and immature neurons. This suggests that during the differentiation of adult neural progenitor cells, Notch signalling may follow a modified version of the classical lateral inhibition model, involving the segregation of individual Notch receptors. Notch3 knockout mice, otherwise neurologically normal, are characterized by a reduced number of mature inhibitory interneurons and an increased number of highly excitable immature neurons in spinal cord laminae I–II. As a result, these mice have permanently lower nociceptive thresholds, similar to chronic pain. These results suggest that defective neuronal differentiation, for example as a result of reduced Notch3 expression or activation, may underlie human cases of intractable chronic pain, such as fibromyalgia and neuropathic pain.

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