La maladie de Parkinson en France (serveur d'exploration)

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Blood vessels change in the mesencephalon of patients with Parkinson's disease

Identifieur interne : 000128 ( Istex/Corpus ); précédent : 000127; suivant : 000129

Blood vessels change in the mesencephalon of patients with Parkinson's disease

Auteurs : Baptiste A. Faucheux ; Yves Agid ; Etienne C. Hirsch ; Anne-Marie Bonnet

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RBID : ISTEX:A99CE814670BE07B9D6D203531D85EF86158E74B
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DOI: 10.1016/S0140-6736(99)00641-8

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ISTEX:A99CE814670BE07B9D6D203531D85EF86158E74B

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<ce:simple-para id="spara10" role="caption">Mean number (SE) of nuclei of non-melanised neurons, melanised neurons, and blood vessel endothelial cells</ce:simple-para>
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<ce:bold>Mesencephalon sub-region</ce:bold>
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<ce:bold>Non-melanised neurons</ce:bold>
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<entry align="left" rowsep="1">Controls (n=10)</entry>
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<entry align="left" rowsep="1">Controls (n=10)</entry>
<entry align="left" rowsep="1">PD patients (n=6)</entry>
<entry align="left" rowsep="1">Controls (n=10)</entry>
<entry align="left" rowsep="1">PD patients (n=6)</entry>
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<entry align="left">0</entry>
<entry align="left">0</entry>
<entry align="left">12 (3)</entry>
<entry align="left">18 (3)</entry>
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<entry align="left">A8</entry>
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<entry align="left">39 (3)</entry>
<entry align="left">0·3 (0·2)</entry>
<entry align="left">0·5 (0·2)</entry>
<entry align="left">13 (3)</entry>
<entry align="left">16 (9)</entry>
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<entry align="left">VTA-Mv</entry>
<entry align="left">9 (2)</entry>
<entry align="left">11 (3)</entry>
<entry align="left">20 (3)</entry>
<entry align="left">17 (3)</entry>
<entry align="left">10 (2)</entry>
<entry align="left">12 (5)</entry>
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<entry align="left">SNpc</entry>
<entry align="left">6 (1)</entry>
<entry align="left">7 (1)</entry>
<entry align="left">19 (2)</entry>
<entry align="left">6 (1)
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<ce:simple-para id="spara20">Quantified in 20 randomly distributed fields in the mesencephalon subregions of patients with Parkinson's disease and controls (number per 0·25 mm
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of 20 μm thick sections).</ce:simple-para>
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<ce:given-name>Baptiste A</ce:given-name>
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<ce:given-name>Yves</ce:given-name>
<ce:surname>Agid</ce:surname>
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<ce:para id="para10">The proportion of dopaminergic neurons that degenerates in Parkinson's disease varies between sub-populations of dopaminergic neurons in the mesencephalon.
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<ce:sup>1</ce:sup>
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Neurotrophic and neurotoxic factors could be involved in neurodegeneration, and local factors such as changes in the vascular system and blood supply might be associated with the differential vulnerability of nigral dopaminergic neurons.</ce:para>
<ce:para id="para20">We have compared the numbers of nuclei of blood vessel endothelial cells, melanised neurons, non-melanised neurons, and glial cells
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in mesencephalon sections from six patients with Parkinson's disease (mean age 74 years [SE 5, range 62–94], mean necropsy delay 21 [4] hours) and ten control patients (mean age 84 [3, range 65–94] years, mean necropsy delay 20 [2] hours). Frozen tissue sections (20 μm) mounted on gelatin-coated glass slides were fixed for 7 weeks in 4% paraformaldehyde and processed for Nissl's staining. Endothelial cell nuclei were identified by both their shapes and location in blood vessels. Quantifications were done in 20 circular fields (125 μm in diameter; randomly distributed throughout the analysed regions and recorded by a computerised plotting system [Histo200 program, Biocom, France]) within four midbrain subregions containing dopaminergic neurons and identified from acetylcholinesterase histochemistry:
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<ce:sup>1</ce:sup>
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SNpc, medioventral part of ventral tegmental area (VTA-Mv, A10 cell group), retrorubral area containing A8 cell group (A8), and central grey substance (CGS).
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<ce:sup>1</ce:sup>
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<ce:para id="para30">42752 cell nuclei were counted. Mean numbers of nuclei located in the four midbrain subregions were very close in patients with Parkinson's disease and controls (SNpc: 433 [SE 27]
<ce:italic>vs</ce:italic>
427 [38] nuclei per 0·25 mm
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</ce:cross-ref>
; VTA-Mv: 443 [21]
<ce:italic>vs</ce:italic>
427 [36]; A8: 523 [28]
<ce:italic>vs</ce:italic>
557 [47]; CGS: 518 [23]
<ce:italic>vs</ce:italic>
531 [47]). Mean numbers of identified non-melanised neurons were nearly identical in the two groups, whereas those of melanised neurons were decreased in the VTA (−19%) and SNpc (−68%) of patients with Parkinson's disease (
<ce:cross-ref refid="tbl1">table</ce:cross-ref>
<ce:float-anchor refid="tbl1"></ce:float-anchor>
) together with a slight increase for glial cells. Mean numbers of nuclei of blood vessel endothelial cells were very similar in the four subregions for control subjects, both for their mean values and variabilities. In patients with Parkinson's disease, they were multiplied by a factor of × 2·5 in the SNpc and only slightly augmented in the VTA, A8, and CGS (+20% to +40%).</ce:para>
<ce:para id="para40">Whether the higher number of endothelial cell nuclei in the SNpc of patients with Parkinson's disease reflects an increase in the number and density of blood vessels or changes in the thickness of vascular walls, or both, needs further investigation. Regional differences in the vascular system and blood supply may be important factors in the pathogenesis of brain diseases. In a study of the associations between neurons and capillaries, Issidorides
<ce:cross-ref refid="bib3">
<ce:sup>3</ce:sup>
</ce:cross-ref>
has shown that the melanin-containing neurons of the SNpc have a close relation with capillary walls in control patients, whereas close contacts are lost in patients with Parkinson's disease. Modifications of the vascular microenvironment of dopaminergic neurons may alter the drawing and transferring of nutrients or toxic compounds. Among others, changes in vascularisation density could concur to iron accumulation, as an increase in lactotransferrin and lactotransferrin receptor expressions have been observed on blood vessels in the SNpc of patients with Parkinson's disease.
<ce:cross-refs refid="bib4 bib5">
<ce:sup>4,5</ce:sup>
</ce:cross-refs>
</ce:para>
<ce:para id="para50" role="acknowledgement">This study was supported, in part, by INSERM, the Association Claude Bernard pour le développement des recherches biologiques et médicales dans les hôpitaux de l'Assistance Publique à Paris, and the National Parkinson Foundation Inc, Miami. We would like to thank C Duyckaerts, J J Hauw, M Laurent, F Piette, D Seilhean, A Sachet, V Sazdovitch, and M Verny for their cooperation in providing the brain specimens.</ce:para>
</ce:sections>
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