Name: chemotherapy-induced vascular toxicity - real-time in vivo imaging of vessel impairment
Uploaded: 2015-01-07T13:00:00
Description: Watch this Scientific Journal Video about Chemotherapy-induced Vascular Toxicity - Real-time In vivo Imaging of Vessel Impairment at JoVE.com

Ethics statement: All experiments were approved by the Institutional Animal Care and Use Committee. Animal care was according to institutional guidelines. ICR female mice (7 - 8 weeks old;&#160;25 - 30 g) were housed in air conditioned, light controlled animal facilities of the Sackler Faculty of Medicine in Tel-Aviv University. At term, animals were euthanized with anesthesia overdose.
1. Fibred Confocal Fluorescence Microscopy (FCFM) Calibration
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	<li>Turn the device O...

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Evaluating chemotherapy-induced vascular toxicity is challenging due to the difficulty in visualizing the dynamics of vasculature in response to a stimuli in real-time. Numerous clinical studies have implicated that several chemotherapies cause direct vascular injury, yet the mechanism and characteristics of this toxicity remains to be elucidated. We have established a real-time, in vivo molecular imaging platform for evaluating the potential vascular toxicity of chemotherapy in mice comprising of fibered confoc...

Clinical evidence indicates that several classes of chemotherapies elicit a variety of vascular pathologies manifested by Raynaud phenomenon, hypertension, myocardialinfarction, cerebrovascular attack, and hepatic veno-occlusivedisease1,2. &#8220;&#8217;Accidental&#8217; anti-angiogenic drugs&#8221; is a fairly new term, which describes conventional chemotherapeutic agents that act as possible angiogenesis inhibitors, although they not originally developed for this purpose3-5 but designed to eliminate tumor cells by imposing as little &#8220;collateral damage&#8221; to normal cells as possible3. Several chemotherapies have been implied as vasculo-toxicants as observed in clinical studies using serum biomarkers. Among these are alkylating agents (such as cyclophosphamide), platinum compounds (such as cisplatin) and anthracyclines1,2,5-7.
Acute cardiovascular complications may occur as a result of vascular toxicity induced by chemotherapy. They may progress into chronic conditions like atherosclerosis and account for increased risk of late vascular morbidity. Yet, despite mounting clinical evidence, there is a paucity of designated studies emphasizing the mechanism of vascular toxicity and therefore, further elucidation of the exact pathogenesis they inflict is warranted.
A major challenge in revealing the mechanism of chemotherapy-induced vascular toxicity derives from the complexity of investigating vascular function in vivo. We describe herein a platform of high-resolution in vivo molecular imaging in mice that enables to capture blood flow and vessels&#8217; characteristics. This platform facilitates the detection of direct treatment-induced vascular effects: in real-time, as well as following them over a period of time within the same individuals.

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			<td height="21" style="height:21px;width:579px;">Name of Material/ Equipment</td>
			<td style="width:423px;">Company</td>
			<td style="width:213px;">Catalog Number</td>
			<td style="width:183px;">Comments/Description</td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;">general anesthesia (100mg/kg ketaset and 6mg/kg XYL-M2).&#160;</td>
			<td>Fort Dodge Animal Health, IA, USA and Biove Laboratories, France</td>
			<td></td>
			<td></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;">a depilatory cream (Veet)</td>
			<td>&#160;ReckittBenckiser, Bristol, UK</td>
			<td></td>
			<td></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;">A 30-gauge, 1/2-inch needle attached to 1 ml syringe&#160;</td>
			<td></td>
			<td></td>
			<td></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;">FITC dextran at a volume of 100 &#181;l (10 mg/ml; FD2000S, MW 2000000 Dalton)&#160;</td>
			<td>Sigma</td>
			<td></td>
			<td></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;">Doxorubicin (8 mg/kg, Adriamycin)</td>
			<td>Teva, Israel</td>
			<td></td>
			<td></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;">paclitaxel (1.2 mg/kg, Medexel)&#160;</td>
			<td>Taro, Israel</td>
			<td></td>
			<td></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;">Saline</td>
			<td></td>
			<td></td>
			<td></td>
		</tr>
	</tbody>
</table>

chemotherapy-induced vascular toxicity - real-time in vivo imaging of vessel impairment

Certain classes of chemotherapies may exert acute vascular changes that may progress into long-term conditions that may predispose the patient to an increased risk of vascular morbidity.&#160;Yet, albeit&#160;the mounting clinical evidence, there is a paucity of clear studies of vascular toxicity and therefore the etiology of a heterogeneous group of vascular/cardiovascular disorders remains to be elucidated. Moreover, the mechanism that may underlie vascular toxicity can completely differ from the principles of chemotherapy-induced cardiotoxicity, which is related to direct myocyte injury. We have established a real-time, in vivo molecular imaging platform&#160;to evaluate&#160;the potential&#160;acute&#160;vascular toxicity of anti-cancer therapies.
We have set up a platform of in vivo, high-resolution molecular imaging&#160;in mice,&#160;suitable for visualizing vasculature within confined organs and reference blood vessels within the same individuals whereas each individual serve as its own control. Blood vessel walls were impaired after doxorubicin administration, representing a unique mechanism of vascular toxicity that may be the early event in end-organ injury. Herein, the method of fibered confocal fluorescent microscopy (FCFM) based imaging is described, which provides an innovative mode to understand physiological phenomena at the cellular and sub-cellular levels in animal subjects.

In vivo continuous imaging at real-time
The imaging apparatus used here is a high definition, fibered confocal microscope, equipped with a probe that enables visualization of vasculature and its response to various stimuli as chemotherapy. This method is minimally invasive since although it may facilitate imaging of deep vessels or organ, it requires a small incision for the probe. The probe bundles consist of tens of thousands of fibers, microscope optics and a proprietary precision con...

Watch this Scientific Journal Video about Chemotherapy-induced Vascular Toxicity - Real-time In vivo Imaging of Vessel Impairment at JoVE.com

Chemotherapy-induced Vascular Toxicity - Real-time In vivo Imaging of Vessel Impairment

We herein describe the method of fibered confocal fluorescent microscopy (FCFM) based imaging, which provides an innovative mode to understand physiological phenomena at the cellular and sub-cellular levels in animal subjects.

Chemotherapy-induced Vascular Toxicity - Real-time In vivo Imaging of Vessel Impairment

Certain classes of chemotherapies may exert acute vascular changes that may progress into long-term conditions that may predispose the patient to an ...

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