Name: protocol for isolating the mouse circle of willis
Uploaded: 2016-10-22T14:00:00
Description: Watch this Scientific Journal Video about Protocol for Isolating the Mouse Circle of Willis at JoVE.com

This work was supported by Paris VI University and a Pierre Fabre Innovation grant.

All procedures were performed in accordance with European Community standards for the care and use of laboratory animals, with the approval of the local ethics committee for animal experimentation (Ile de France-Paris-Committee, Authorization 4270).
1. Anesthesia
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	<li>Infuse a lethal dose of pentobarbital (up to 1 mg/10 g body weight) intraperitoneally (27-gauge needle and 1-ml syringe) into adult mice before surgery.</li>
</ol>
2. Vessel Perfusion
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<ol>
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We describe here a reproducible protocol for the isolation of the circle of Willis. The most common cerebrovascular disorders involving the CoW are CAA-associated vasculopathies, intracranial atherosclerosis and intracranial aneurysm, all of which affect the walls of arterial vessels. The risk factors are well known, but the molecular pathogenesis of these cerebral disorders remains poorly understood and specific biological markers for predicting their occurrence are lacking. There is considerable interest in methods for...

The cerebral arterial circle (circulus arteriosus cerebri), also known as the circle of Willis (CoW), loop of Willisor Willis polygon) was first described by Thomas Willis in 1664. It is a circulatory anastomosis located around the optic chiasma and hypothalamus that can be considered as a central hub supplying blood to the brain and surrounding structures. Blood enters this structure via the internal carotid and vertebral arteries and it flows out of the circle via the interior middle and posterior cerebral arteries. Each of these arteries has left and right branches on either side of the circle. The basilar, post communicating, and anterior communicating arteries complete the circle (Figure 1 and Figure 2). The risk of impaired blood flow in any of the outflow arteries is minimized by the merging of blood entering the circle from the carotid and cerebral arteries, thereby guaranteeing that sufficient blood is supplied to the brain. This structure also serves as the main route for collateral blood flow in severe occlusive diseases of the internal carotid artery.
Several types of cerebrovascular disorders have their origin in the CoW. The most common are cerebral amyloid angiopathy (CAA)-associated vasculopathies, intracranial atherosclerosis and intracranial aneurysms. 1,2,3 These disorders may lead to hypoperfusion due to vasodilation, and intracerebral and/or subarachnoid hemorrhages ultimately translating into ischemic or hemorrhagic strokes or, at best, a transient ischemic attack. Recent advances in diagnostic procedures, including neuroimaging, possibly combined with angiography, have made it possible to diagnose these major cerebrovascular diseases clinically, without the need for a brain biopsy. Nevertheless, effective and specific treatments (pharmacological or endovascular) are currently lacking and there is therefore a need to define new molecular targets.
The identification of novel drug targets for the prevention of these diseases in humans will require animal models and ways of isolating the cerebro-vasculature including the CoW. Such models should provide evidence of and clues to the specific changes, including inflammatory changes, occurring in the walls of the large vessels in animal models of intracranial artery aneurysm, CAA or intracranial atherosclerosis. 4,5,6
We have established a method for mouse CoW isolation to facilitate studies of vessel inflammation in Alzheimer&#39;s disease (AD) and related diseases, such as CAA. This method for isolating the mouse CoW was developed for the assessment of inflammatory cerebrovascular gene expression during disease progression. Together with the detection of amyloid beta deposition within the walls of the leptomeningeal and pial arteries, this method could make it easier to determine the possible relationship between inflammatory gene expression in the cerebro-vasculature wall and A&#946;-peptide accumulation. The vascular network of the brain, including the leptomeningeal and pial in the subarachnoid space, is an extension of the large arteries forming the circle of Willis. The method described here could be used to isolate the CoW of any mouse lineage and could be used for all types of screening (e.g., gene expression, protein production and posttranslational protein modifications) on the large vessels of the mouse cerebro-vasculature.

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protocol for isolating the mouse circle of willis

The cerebral arterial circle (circulus arteriosus cerebri) or circle of Willis (CoW) is a circulatory anastomosis surrounding the optic chiasma and hypothalamus that supplies blood to the brain and surrounding structures. It has been implicated in several cerebrovascular disorders, including cerebral amyloid angiopathy (CAA)-associated vasculopathies, intracranial atherosclerosis and intracranial aneurysms. Studies of the molecular mechanisms underlying these diseases for the identification of novel drug targets for their prevention require animal models. Some of these models may be transgenic, whereas others will involve isolation of the cerebro-vasculature, including the CoW.The method described here is suitable for CoW isolation in any mouse lineage and has considerable potential for screening (expression of genes, protein production, posttranslational protein modifications, secretome analysis, etc.) studies on the large vessels of the mouse cerebro-vasculature. It can also be used for ex vivo studies, by adapting the organ bath system developed for isolated mouse olfactory arteries.

The PBS-perfused mouse is killed and the CoW is isolated as described in section 3.2 of the protocol. When the dissection is performed correctly, the CoW should come out in one piece and should be slightly transparent due to the absence of residual blood in the vasculature.
<img alt="Figure 2" src="/files/ftp_upload/54352/54352fig2.jpg" /> 
Figure 2: The Mouse CoW after Isolation. (A) Overv...

Watch this Scientific Journal Video about Protocol for Isolating the Mouse Circle of Willis at JoVE.com

Protocol for Isolating the Mouse Circle of Willis

We describe here a reproducible protocol for isolating the mouse circle of Willis.

The cerebral arterial circle (circulus arteriosus cerebri) or circle of Willis (CoW) is a circulatory anastomosis surrounding the optic chiasma and ...

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