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Fractional anisotropy in the substantia nigra in Parkinson's disease: a complex picture
Umeå universitet, Medicinska fakulteten, Institutionen för farmakologi och klinisk neurovetenskap, Klinisk neurovetenskap.
Umeå universitet, Medicinska fakulteten, Institutionen för strålningsvetenskaper.
Umeå universitet, Medicinska fakulteten, Institutionen för strålningsvetenskaper. Umeå universitet, Medicinska fakulteten, Institutionen för integrativ medicinsk biologi (IMB).
Umeå universitet, Medicinska fakulteten, Institutionen för strålningsvetenskaper.
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2015 (Engelska)Ingår i: European Journal of Neurology, ISSN 1351-5101, E-ISSN 1468-1331, Vol. 22, nr 10, s. 1410-1416Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

Background and purpose: This study employs magnetic resonance imaging (MRI) diffusion tensor imaging to compare diffusion measures in the brains of patients with Parkinson's disease (PD) with healthy controls using longitudinal data. Methods: One-hundred and twenty-two patients and 34 controls were included at baseline. The MRI investigations were repeated after 1, 3 and 5 years. The diffusion measures were quantified using fractional anisotropy and mean, radial and axial diffusion (FA, MD, RD, AD). Regions of interest included the anterior, middle and posterior substantia nigra (SN), but also other areas. Linear models were used to test for the effect of disease and hemispheric lateralization. The P value was set at 0.05 (Bonferroni corrected). Results: Fractional anisotropy and AD were increased in the three nigral subareas in PD (P < 0.01), but MD and RD were unaltered. The right SN had higher FA than the left in all subareas (P < 0.01). MD and AD were increased in the right anterior part (P < 0.04), whereas MD and RD were decreased in the right middle and posterior parts (P < 0.001). The left middle cerebellar peduncle had increased FA and AD (P < 0.001) and decreased MD and RD (P < 0.01) compared to the right. Diffusion measures did not progress over time and side differences were not related to disease or lateralization of symptoms. Conclusions: Increased FA in the SN in PD indicates gliosis and inflammation in the nuclei, but possibly also intrusion of surrounding fibres into the shrinking structure. The hemispheric side differences of diffusion might reflect natural lateralization of connectivity, but their relation to PD must be studied further.

Ort, förlag, år, upplaga, sidor
2015. Vol. 22, nr 10, s. 1410-1416
Nyckelord [en]
diffusion imaging, fractional anisotropy, lateralization, Parkinson, substantia nigra
Nationell ämneskategori
Neurologi
Identifikatorer
URN: urn:nbn:se:umu:diva-111012DOI: 10.1111/ene.12760ISI: 000362672700012PubMedID: 26118635OAI: oai:DiVA.org:umu-111012DiVA, id: diva2:867046
Tillgänglig från: 2015-11-04 Skapad: 2015-11-02 Senast uppdaterad: 2018-06-07Bibliografiskt granskad

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Lenfeldt, NiklasLarsson, AnneNyberg, LarsBirgander, RichardForsgren, Lars

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Lenfeldt, NiklasLarsson, AnneNyberg, LarsBirgander, RichardForsgren, Lars
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Klinisk neurovetenskapInstitutionen för strålningsvetenskaperInstitutionen för integrativ medicinsk biologi (IMB)
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European Journal of Neurology
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