Substantia nigra echogenicity is correlated with nigrostriatal impairment in Machado-Joseph disease |
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Authors: | José Luiz Pedroso Edson Bor-Seng-Shu André C Felício Pedro Braga-Neto Marcelo Q Hoexter Manoel Jacobsen Teixeira Rodrigo A Bressan Orlando Graziani Povoas Barsottini |
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Institution: | 1. Department of Neurology, Ataxia Unit, Universidade Federal de São Paulo, Rua Botucatu, 740, São Paulo 04.023-900, SP, Brazil;2. Department of Clinical Neurosurgery, Universidade de São Paulo, São Paulo, Brazil;3. Department of Psychiatry, Laboratório Interdisciplinar de Neurociencias Clinicas (LiNC), Universidade Federal de São Paulo, São Paulo, Brazil |
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Abstract: | BackgroundSeveral studies have demonstrated increased substantia nigra (SN) echogenicity in Parkinson's disease (PD) and Machado-Joseph disease (MJD). Pathological substrate of PD is characterized by dopaminergic nigrostriatal cell loss, also found in MJD. Also, SN hyperechogenicity might be associated with nigrostriatal dysfunction in PD, when comparing dopamine transporter binding with SN echogenicity. The present study aimed to correlate the SN echogenic size and striatal dopamine transporter density in MJD patients.MethodsWe performed TCS in 30 subjects and SPECT with 99mTc]-TRODAT-1 in 18 subjects with MJD. Fifteen healthy subjects matched for age and gender formed a control group. TCS and 99mTc]-TRODAT-1 SPECT findings from both MJD patients and control subjects were compared.ResultsThere were no differences regarding age (p = 0.358) or gender (p = 0.566) between groups (MJD versus control group). Mean DAT binding potentials and SN echogenicity were significantly different between groups. There was a significant negative correlation with regard to the SN echogenic size and the ipsilateral striatal TRODAT-1 uptake: the higher the SN echogenicity, the lower the DAT uptake in the ipsilateral cerebral hemisphere.ConclusionIncrease in SN echogenic size likely correlates with presynaptic dopaminergic nigrostriatal dysfunction in MJD, suggesting a concurrent in vivo pathophysiological mechanism. |
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Keywords: | Transcranial sonography Dopamine transporter Dopaminergic dysfunction Machado-Joseph disease |
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