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Neuropeptide Y immunoreactive neurons in murine trisomy 16 cortical cultures

Plasticity of expression and differentiation

  • Original Articles
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Molecular and Chemical Neuropathology

Abstract

Neuropeptide Y (NPY)-containing neurons are depleted in the cortices of individuals with Alzheimer disease (AD), yet spared in the striatum of patients with Huntington chorea. It is unknown whether this neuronal phenotype is inherently susceptible to the neurodegenerative processes that are a hallmark of AD. To study this question, the murine trisomy 16 model of Down syndrome and Alzheimer disease was investigated. Since trisomic fetuses diein utero, studies were carried out on primary cultures of dissociated cortical neurons. These were prepared from 15-d gestational trisomy 16 fetuses and their littermate euploid controls, and examined by immunocytochemical staining for neuropeptide Y at 7 and 12 d in vitro. Trisomy 16 neurons were also grown on euploid glial carpets, whereas euploid neurons were grown on trisomic glia. The results demonstrate a significant increase in the number of NPY neurons and a stunting in the dendritic arbor of these neurons in trisomic vs euploid cortex. Both of these parameters could be normalized by direct contact with euploid glia. When euploid cortex was plated on trisomic glia, the number of NPY neurons and their morphology were altered so that they began to resemble trisomic NPY cortical neurons. These results indicate a dysregulation of NPY neuronal expression and differentiation in trisomy 16 cortex that are modifiable by interaction with euploid glia and imply an abnormal trophic (glial) environment in trisomic cortex.

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  1. Department of Psychiatry, Northwestern University Medical School, Evanston Hospital, 2650 Ridge Ave., 60201, Evanston, IL

    Maria T. Caserta

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Caserta, M.T. Neuropeptide Y immunoreactive neurons in murine trisomy 16 cortical cultures. Molecular and Chemical Neuropathology 22, 197–210 (1994). https://doi.org/10.1007/BF03160106

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  • DOI: https://doi.org/10.1007/BF03160106

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