Name: neurobehavioral assessments in a mouse model of neonatal hypoxic-ischemic brain injury
Uploaded: 2017-11-24T12:30:00
Description: Watch this Scientific Journal Video about Neurobehavioral Assessments in a Mouse Model of Neonatal Hypoxic-ischemic Brain Injury at JoVE.com

This study was supported by grants from National Research Foundation (NRF-2014R1A2A1A11052042; 2015M3A9B4067068), the Ministry of Science and Technology, Republic of Korea, the Korean Health Technology R&#38;D Project (HI16C1012), Ministry of Health &#38; Welfare, Republic of Korea, and the &#8220;Dongwha&#8221; Faculty Research Assistance Program of Yonsei University College of Medicine (6-2016-0126).

All animals were housed in a standard cage (27 &#215; 22.5 &#215; 14 cm3) in a facility accredited by the Association for Assessment and Accreditation of Laboratory Animal Care (AAALAC) and given food and water ad libitum under alternating 12-h light/dark cycles. The authors followed animal protection regulations, and the experimental procedures were approved by the Institutional Animal Care and Use Committee of Yonsei University College of Medicine (IACUC No. 2010-0252; 2013-0220).
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In this study, we induced HI brain injury in a neonatal P7-10 CD-1 mouse and identified the brain lesion with relevant cognitive and motor deficits. During this procedure, occlusion of the unilateral right carotid artery was critical. In this step, the artery could be damaged and torn. Most pups who experienced an artery tear died. Conversely, if researchers ligated another blood vein instead of the unilateral right carotid artery, the brain of the pup was only mildly damaged, and no significant phenotype could be observ...

Neonatal HI brain injury occurs during early childhood (approximately two patients per 1,000 children)1,2,3,4,5. Studies regarding neonatal HI brain injury are important, and using an established neonatal HI brain injury mouse model can facilitate in vivo preclinical research on HI brain injury.
Traditional HI models are used on adult rats6. For the neonate model, the Rice-Vannucci method is commonly used on P7 rats7,8. However, since rats and mice are slightly different9,10, even though they are both rodents, we performed a modified Rice-Vannucci method on CD-1 pups at P7-10, based on previous studies that showed that P7-10 is the period featuring immature oligodendrocytes, corresponding to human term P011,12. The neonatal HI mouse model is established through both the ligation of the unilateral carotid artery and the exposure of the mice to hypoxia with 8% oxygen in P7-10 pups.
The mice subjected to the procedure showed various degrees of brain lesions in the posterolateral area of the right hemisphere. To identify the cognitive and motor deficits, neurobehavioral assessments based on the PAT, ladder walking test, and grip strength test were performed. The differences between non-operated (i.e., normal) and HI mice were analyzed. This work presents basic information on the HI mouse model. The MRI images demonstrate the different phenotypes, separated according to the severity of brain damages using motor and cognitive tests.

<table border="0" cellpadding="0" cellspacing="0" width="1008">
	<tbody>
		<tr height="25">
			<td height="25" style="height:25px;width:363px;">Hypoxic chamber</td>
			<td style="width:203px;">Jeung Do Bio &#38; Plant Co</td>
			<td colspan="2" style="width:443px;">Experimental Builder&#160;</td>
		</tr>
		<tr height="25">
			<td height="25" style="height:25px;">PAT apparatus&#160;</td>
			<td>Jeung Do Bio &#38; Plant Co</td>
			<td colspan="2">Experimental Builder&#160;</td>
		</tr>
		<tr height="25">
			<td height="25" style="height:25px;">The ladder rung walking&#160;</td>
			<td>Jeung Do Bio &#38; Plant Co</td>
			<td colspan="2">Experimental Builder&#160;</td>
		</tr>
		<tr height="25">
			<td height="25" style="height:25px;">SDI Grip Strength System&#160;</td>
			<td colspan="2">San Diego Instruments Inc.</td>
			<td></td>
		</tr>
		<tr height="25">
			<td height="25" style="height:25px;width:363px;">Grip-Strength Meter</td>
			<td>Ugo Basile&#160;</td>
			<td align="right">47200</td>
			<td></td>
		</tr>
		<tr height="25">
			<td height="25" style="height:25px;">Harvard Apparatus Fluovac anesthetizing system&#160;</td>
			<td>Harvard Apparatus</td>
			<td></td>
			<td></td>
		</tr>
		<tr height="25">
			<td height="25" style="height:25px;">Anesthetizing box</td>
			<td></td>
			<td></td>
			<td>acryl box</td>
		</tr>
		<tr height="25">
			<td height="25" style="height:25px;">I-Fran Liquid (Isofluorane)</td>
			<td>Hana Pharm. Co., Ltd.</td>
			<td></td>
			<td>General Anesthetics ( isoflurane 100ml)</td>
		</tr>
		<tr height="25">
			<td height="25" style="height:25px;">CD-1 mice</td>
			<td>Orient Co., Ltd.</td>
			<td></td>
			<td></td>
		</tr>
		<tr height="25">
			<td height="25" style="height:25px;">Blue Nylon Mono Non-Absorbbable suture 5-0 50cm</td>
			<td>Ailee Co., Ltd.</td>
			<td>NB 521</td>
			<td></td>
		</tr>
		<tr height="25">
			<td height="25" style="height:25px;">IBM SPSS Statistics</td>
			<td>IBM</td>
			<td>Ver. 23</td>
			<td></td>
		</tr>
	</tbody>
</table>

neurobehavioral assessments in a mouse model of neonatal hypoxic-ischemic brain injury

We performed unilateral carotid artery occlusion on CD-1 mice to create a neonatal hypoxic-ischemic (HI) model and investigated the effects of neonatal HI brain injury by studying neurobehavioral functions in these mice compared to non-operated (i.e., normal) mice. During the study, Rice-Vannucci&#39;s method was used to induce neonatal HI brain damage in postnatal day 7-10 (P7-10) mice. The HI operation was performed on the pups by unilateral carotid artery ligation and exposure to hypoxia (8% O2 and 92% N2 for 90 min). One week after the operation, the damaged brains were evaluated with the naked eye through the semi-transparent skull and were categorized into subgroups based on the absence (&#34;no cortical injury&#34; group) or presence (&#34;cortical injury&#34; group) of cortical injury, such as a lesion in the right hemisphere. On week 6, the following neurobehavioral tests were performed to evaluate the cognitive and motor functions: passive avoidance task (PAT), ladder walking test, and grip strength test. These behavioral tests are helpful in determining the effects of neonatal HI brain injury and are used in other mouse models of neurodegenerative diseases. In this study, neonatal HI brain injury mice showed motor deficits that corresponded to right hemisphere damage. The behavioral test results are relevant to the deficits observed in human neonatal HI patients, such as cerebral palsy or neonatal stroke patients. In this study, a mouse model of neonatal HI brain injury was established and showed different degrees of motor deficits and cognitive impairment compared to non-operated mice. This work provides basic information on the HI mouse model. MRI images demonstrate the different phenotypes, separated according to the severity of brain damage by motor and cognitive tests.

All data are expressed as the mean &#177; standard error of the mean (SEM). The comparison of variables between the two groups was conducted using an independent or paired t-test on SPSS statistics software. A p-value &#60;0.05 was considered statistically significant.
The brains with neonatal HI injury showed different severity of damage and were categorized accordingly (Figure 1C...

Watch this Scientific Journal Video about Neurobehavioral Assessments in a Mouse Model of Neonatal Hypoxic-ischemic Brain Injury at JoVE.com

Neurobehavioral Assessments in a Mouse Model of Neonatal Hypoxic-ischemic Brain Injury

We performed unilateral carotid artery occlusion on postnatal day 7-10 CD-1 mouse pups to create a neonatal hypoxic-ischemic (HI) model and investigated the effects of HI brain injury. We studied neurobehavioral functions in these mice compared to non-operated normal mice.

We performed unilateral carotid artery occlusion on CD-1 mice to create a neonatal hypoxic-ischemic (HI) model and investigated the effects of neonatal HI ...

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