Name: a murine model of dengue virus-induced acute viral encephalitis-like disease
Uploaded: 2019-04-28T14:00:00
Description: Watch this Scientific Journal Video about A Murine Model of Dengue Virus-induced Acute Viral Encephalitis-like Disease at JoVE.com

This study was supported by grants from the Ministry of Science and Technology (MOST107-2321-B-038-001) and the intramural funding 106TMU-CIT-01-2, Taipei, Taiwan.

Experimental protocols of animal study were approved by the Institutional Animal Care and User Committee of the National Defense Medical Center (IACUC number: 16-261), according to guidelines established by the Ministry of Science and Technology, Taiwan.
1. Infection Procedure
<ol>
	<li>Prepare nonadapted DENV2 (strain PL046) stocks9 (originally obtained from the Centers for Disease Control in Taiwan, ranging from 2.5 x 107 to 1 x 109 PFU/mL).</l...

<ol>
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DENV infection has been detected in the CNS of severe dengue patients3,17, suggesting the possibility of the manifestation of acute viral encephalitis occurred during dengue pathogenesis. Here, we report an in vivo murine model of DENV infection for studying the involvement of CNS dysfunction in severe dengue, particularly with a focus on DENV-induced acute viral encephalitis-like illnesses. As compared with the previous models, particularly for one-route infecti...

DENV, an arthropod-borne virus of the Flaviviridae family, contains a positive-sense RNA genome that encodes three viral structural proteins (capsid, premembrane, and envelope) and seven viral nonstructural proteins (NS1, NS2A, NS2B, NS3, NS4A, NS4B, and NS5). The four serotypes of DENV (DENV1-4), which infect approximately 390 million people annually, cause a global burden even though governments have directed substantial efforts toward mosquito vector and disease control1. Currently, protective vaccines and therapeutic antiviral drugs are under development and require further long-term validation2. In clinical practice, although a dengue patient with CNS infection is rare, it needs to be further explored to understand the diversity of dengue disease development3. Further investigation and validation are needed; notably, the World Health Organization (WHO) has included the involvement of CNS impairment, such as cognitive impairment, convulsions, encephalopathy, and encephalitis, in the classification of severe dengue3,4. Constructing animal models of DENV infection is indispensable for exploring the neuropathogenesis of DENV infection.
For generating CNS infection by DENV, several studies have executed different routes of DENV infection, including (1) intracerebral inoculation of C57BL/6 mice who received 4 x 103 plaque-forming units (PFU) of nonadapted DENV35,6, (2) intraperitoneal inoculation of BALB/c mice who received 7 x 104 PFU of in vitro neuroadapted DENV47, (3) intracerebral inoculation of Swiss mice who received 1 x 105 PFU of in vivo neuroadapted DENV18, and (4) intracerebral and intraperitoneal co-inoculation of ICR suckling mice who received 1 x 106 PFU of nonadapted DENV29. According to the findings of these studies5,6,7,8,9, DENV infection in mice result in viral replication in the brain, leading to acute viral encephalitis-like syndromes, behavioral changes accompanied by limb paralysis and postural instability, CNS neurotoxicity and inflammation, general and localized plasma leakage through the blood-brain barrier (BBB), and lethality. All the results from these studies5,6,7,8,9 have shown the ability of DENV to infect the CNS and the induction of acute viral encephalitis-like disease following infection.
Based on our current findings9,10,11,12,13,14,15, we have created a murine model of DENV infection as an in vivo platform to examine the therapeutic efficacy of targeted agents/factors against viral replication, as well as neurotoxicity. Here, we report the protocol utilized to create an immunocompetent outbred ICR mouse to study CNS infection and to monitor the development of neuropathies with different severities caused by DENV. The results show the significant progression of encephalitis-like disease in DENV-infected mice in a time-dependent manner.

<table border="0" cellpadding="0" cellspacing="0" style="width:745px;" width="746">
	<tbody>
		<tr height="46">
			<td height="46" style="height:47px;width:216px;">Roswell Park Memorial Institute 1640 medium (RPMI)</td>
			<td style="width:211px;">Gibco</td>
			<td style="width:119px;">11875-085</td>
			<td style="width:200px;">Diluting virus</td>
		</tr>
		<tr height="46">
			<td height="46" style="height:47px;width:216px;">0.3-mL Insulin Syringe&#160;</td>
			<td style="width:211px;">BD Ultra-Fine&#173;II</td>
			<td style="width:119px;">328838</td>
			<td style="width:200px;">Intracerebral and intraperitoneal injection</td>
		</tr>
		<tr height="46">
			<td height="46" style="height:47px;width:216px;">Microbalance</td>
			<td style="width:211px;">METTLER TOLEDO&#39;s LabX</td>
			<td style="width:119px;">AL104</td>
			<td style="width:200px;">Weight mouse</td>
		</tr>
		<tr height="42">
			<td height="42" style="height:42px;width:216px;">Non-adapted DENV2 (strain PL046)</td>
			<td style="width:211px;">The Centers for Disease Control of Taiwan</td>
			<td style="width:119px;">-</td>
			<td style="width:200px;">Infect mouse</td>
		</tr>
		<tr height="42">
			<td height="42" style="height:42px;width:216px;">Institute of Cancer Research (ICR) suckling mouse</td>
			<td style="width:211px;">BioLASCO Taiwan Co., Ltd</td>
			<td style="width:119px;">-</td>
			<td style="width:200px;">Our murine model</td>
		</tr>
	</tbody>
</table>

a murine model of dengue virus-induced acute viral encephalitis-like disease

Dengue virus (DENV), an arthropod-borne virus transmitted by mosquitoes, may cause the severe disease known as dengue hemorrhagic fever, which is characterized by lethal complications due to plasma leakage, ascites, pleural effusion, respiratory distress, severe bleeding, and organ impairment. A few cases of DENV infection present neurological manifestations; however, studies have not explored DENV-induced neuropathogenesis further. In this study, we present a protocol to use an immunocompetent outbred ICR (Institute of Cancer Research) mouse for investigating the induction of central nervous system (CNS) infection with DENV, followed by the progression of acute viral encephalitis-like disease.

Severe dengue-associated neurological complications have been reported in patients for dengue pathogenesis4. Although these cases are rare in the clinic, creating an immunocompetent murine model of DENV infection can be used not only for studying immunopathogenesis but also for exploring CNS infection, neuroinflammation, neurotoxicity, and acute viral encephalitis-like disease. In this study, according to our current model9,<sup c...

Watch this Scientific Journal Video about A Murine Model of Dengue Virus-induced Acute Viral Encephalitis-like Disease at JoVE.com

A Murine Model of Dengue Virus-induced Acute Viral Encephalitis-like Disease

Here, we present a protocol for creating an immunocompetent ICR (Institute of Cancer Research) murine model of central nervous system infection to display the development of neuropathy. Monitoring acute viral encephalitic disorders by identical disease scores could be performed for showing dengue virus-induced neuropathy in vivo.

Dengue virus (DENV), an arthropod-borne virus transmitted by mosquitoes, may cause the severe disease known as dengue hemorrhagic fever, which is ...

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