Name: intravital imaging of neutrophil priming using il-1&#946; promoter-driven dsred reporter mice
Uploaded: 2016-06-22T13:00:00
Description: Watch this Scientific Journal Video about Intravital Imaging of Neutrophil Priming Using IL-1ÃŽÂ² Promoter-driven DsRed Reporter Mice at JoVE.com

The authors have no acknowledgements.

All animal experiments are performed in accordance with the National Institutes of Health guidelines and approved by the Institutional Animal Care and Use Committee of the University of Toledo.
1. Phenotyping of pIL1-DsRed Mice
NOTE: Offspring are generated by breeding heterozygous pIL1-DsRed mice with wild-type (WT) C57BL6 mice. Three to four week old pups are considered ready for phenotyping. Submandibular bleeding of mice follows an established protocol with minor ...

<ol>
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The aim of this study is to develop a technology for monitoring the process of neutrophil priming in living animals, which has not yet been fulfilled by the currently available techniques. To achieve this goal, three established methodologies are performed: 1) induction of skin inflammation in IL-1&#946; promoter-driven DsRed reporter mice as a measure of priming, 2) in vivo labeling of neutrophils with low doses of fluorescence-conjugated anti-Ly6G mAb, and 3) intravital confocal microscopy imaging. The combina...

Neutrophils are the most abundant and short-lived leukocytes in circulation. They are rapidly recruited to the sites of infection or injury, where they serve as professional phagocytes through release of reactive oxygen and nitrogen intermediates along with granules containing antimicrobial peptides and proteases1. During their recruitment, neutrophils are &#34;primed&#34; by various agents including microbial products, chemoattractants, and inflammatory cytokines, resulting in markedly enhanced phagocyte functionality upon arrival at a site of inflammation2. The mechanisms of neutrophil priming have been extensively studied in vitro3,4; however, dynamic monitoring of the process in vivo has not been possible to date.
Recently, intravital imaging has become an important technique for visualizing and quantifying the cellular dynamics of biological processes in living organisms. Intravital imaging can be performed via conventional one-photon excitation microscopy (e.g., confocal) or multiphoton microscopy approaches5. Over time, substantial improvements have been achieved in this technique enabling increased image resolution, improved imaging depth, decreased tissue photodamage, and enhanced image stabilization6,7. Given its unique ability to enable dynamic visualization of cellular migration and interaction over time, intravital microscopy has been extensively applied to diverse areas of study in immunology8. Intravital imaging enables immunologists to better understand and contextualize immune responses at both the cellular and molecular level in living animal models.
Recent advances in transgenic as well as knock-in reporter mice have provided useful tools for monitoring the dynamic behaviors of neutrophils in living animals. Lysozyme M promoter-driven enhanced green fluorescent protein knock-in mice have been broadly used to characterize motility of neutrophils, monocytes, and macrophages during various inflammatory processes including extravasation, bacterial infection, and sterile inflammation9-15. Further, transgenic mice expressing a cytoplasmic fluorescence resonance energy transfer biosensor have been employed in studying the activities of neutrophil extracellular-regulated mitogen kinase and protein kinase A within inflamed intestine16. A murine model with high specificity for fluorescence expression in neutrophils is the Catchup knock-in mouse, which produces Cre recombinase as well as the fluorescent protein tdTomato, which itself is coupled to expression of lymphocyte antigen 6G (Ly6G)17. Visualization of Ly6G-deficient neutrophils via this model has demonstrated that these cells exert normal functionality in a variety of sterile or infectious in vivo inflammatory contexts. Transgenic mice expressing the DsRed fluorescent protein gene under the control of the mouse interleuikin-1&#946; (IL-1&#946;) promoter (pIL1-DsRed) have been utilized to visualize the motile behaviors of IL-1&#946; producing cells &#8212; believed to include neutrophils, inflammatory monocytes, and activated macrophages &#8212; emerging in inflamed skin18.
In vivo labeling can serve as an alternative approach for tracing the cellular and molecular behaviors of neutrophils in inflamed tissues. After intravenous injection of low doses of fluorescently labeled anti-Gr-1 monoclonal antibody (mAb), the recruitment cascade of Gr-1+ neutrophils has been visualized in mouse skin lesions infected with Staphylococcus aureus19. In vivo administration of conjugates containing streptavidin-conjugated 705 nm quantum dots and biotinylated anti-Ly6G mAb specifically label circulating neutrophils20. Moreover, endocytosis of such conjugates into neutrophil vesicles allows tracking of high-speed vesicle transport in neutrophils migrating into the interstitium. In vivo labeling with fluorescence-conjugated antibodies against P-selectin glycoprotein ligand-1 (PSGL-1), L-selectin (CD62L), integrin &#945;M (CD11b) and chemokine (C-X-C motif) receptor 2 (CXCR2) in a TNF&#945;-induced inflammatory model has elucidated the regulatory mechanisms at play during early inflammation21. Polarized neutrophils protrude PSGL-1-enriched uropods to interact with CD62L present on activated platelets, resulting in the redistribution of CD11b and CXCR2, receptors that drive neutrophil migration and initiate the inflammation.
IL-1&#946; is one of the signature genes that is elevated in primed neutrophils22. In pIL1-DsRed reporter mice, DsRed fluorescence signals (i.e., activation of IL-1&#946; promoter) positively correlate with IL-1&#946; mRNA expression and IL-1&#946; protein production.18 To monitor the process of neutrophil priming, an intravital microscopy method was developed involving induction of skin inflammation with oxazolone (OX) in the pIL1-DsRed mouse model following in vivo labeling of neutrophils with fluorescence-conjugated anti-Ly6G mAb. Via this model, it is possible to study the behavior and function of primed neutrophils in animal models of various diseases and disorders.

<table>
	<tbody>
		<tr height="21">
			<td height="21" style="height:21px;width:196px;">Heparin sodium</td>
			<td style="width:165px;">APP Pharmaceuticals</td>
			<td style="width:139px;">NDC 63323-540-31</td>
			<td style="width:191px;"></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;width:196px;">ACK lysing buffer</td>
			<td style="width:165px;">Lonza</td>
			<td style="width:139px;">10-548E</td>
			<td></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;width:196px;">Fetal bovine serum</td>
			<td style="width:165px;">Sigma-Aldrich</td>
			<td style="width:139px;">F0926</td>
			<td></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;width:196px;">Lipopolysaccharides</td>
			<td style="width:165px;">Sigma-Aldrich</td>
			<td style="width:139px;">L4391</td>
			<td></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;width:196px;">Ketamine hydrochloride</td>
			<td style="width:165px;">Hospira</td>
			<td style="width:139px;">NDC 0409-2051-05</td>
			<td></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;">Xylazine</td>
			<td style="width:165px;">LLOYD Laboratory</td>
			<td style="width:139px;">NADA #139-236</td>
			<td></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;">Acepromazine</td>
			<td style="width:165px;">Boehringer Ingelheim</td>
			<td style="width:139px;">ANADA 200-361</td>
			<td></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;">Hair-removal cream</td>
			<td style="width:165px;">Church &#38; Dwight</td>
			<td></td>
			<td></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;">Acetone</td>
			<td style="width:165px;">Fisher Scientific</td>
			<td style="width:139px;">A16P4</td>
			<td></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;">Oxazolone</td>
			<td style="width:165px;">Sigma-Aldrich</td>
			<td style="width:139px;">E0753</td>
			<td></td>
		</tr>
		<tr height="40">
			<td height="40" style="height:40px;width:196px;">Alexa Fluor 647 anti-mouse Ly6G antibody</td>
			<td>BioLegend</td>
			<td style="width:139px;">127610</td>
			<td></td>
		</tr>
		<tr height="40">
			<td height="40" style="height:40px;width:196px;">U-100 insulin syringe with 28 G needle</td>
			<td>BD</td>
			<td>329461</td>
			<td></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;width:196px;">FITC-CM-Dextran, 150 Kda</td>
			<td>Sigma-Aldrich</td>
			<td style="width:139px;">74817</td>
			<td></td>
		</tr>
		<tr height="42">
			<td height="42" style="height:42px;width:196px;">Butterfly infusion set (27 G needle)</td>
			<td>BD</td>
			<td style="width:139px;">387312</td>
			<td></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;">FACSCalibur cytometer</td>
			<td>BD</td>
			<td></td>
			<td></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;">CellQuest Pro software</td>
			<td>BD</td>
			<td></td>
			<td></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;">Confocal microscope</td>
			<td>Olympus</td>
			<td>FV1000</td>
			<td></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;">Metamorph Software</td>
			<td>Universal Imaging</td>
			<td></td>
			<td></td>
		</tr>
	</tbody>
</table>

intravital imaging of neutrophil priming using il-1&#946; promoter-driven dsred reporter mice

Neutrophils are the most abundant leukocytes in human blood circulation and are quickly recruited to inflammatory sites. Priming is a critical event that enhances the phagocytic functionality of neutrophils. Although extensive studies have unveiled the existence and importance of neutrophil priming during infection and injury, means of visualizing this process in vivo have been unavailable. The protocol provided enables monitoring of the dynamic process of neutrophil priming in living animals by combining three methodologies: 1) DsRed reporter signal &#8212; used as a measure of priming 2) in vivo neutrophil labeling &#8212; achieved by injection of fluorescence-conjugated anti-lymphocyte antigen 6G (Ly6G) monoclonal antibody (mAb) and 3) intravital confocal imaging. Several critical steps are involved in this protocol: oxazolone-induced mouse ear skin inflammation, appropriate sedation of animals, repeated injections of anti-Ly6G mAb, and prevention of focus drift during imaging. Although a few limitations have been observed, such as the limit of continuous imaging time (~ 8 hr) in one mouse and the leakage of fluorescein isothiocyanate-dextran from blood vessels in the inflammatory state, this protocol provides a fundamental framework for intravital imaging of primed neutrophil behavior and function, which can easily be expanded to examination of other immune cells in mouse inflammation models.

Screening of pIL1-DsRed mice is performed based on the phenotypic DsRed fluorescence signal produced by their peripheral blood leukocytes using flow cytometry. LPS stimulation is known to induce IL-1&#946; production in myeloid cells including neutrophils, monocytes, and dendritic cells26-28. Thus, isolated leukocytes are incubated with LPS for 4 hr prior to flow cytometry analysis. Next, gating is set for circulating myeloid cells based on cell size (FSC) and internal complexi...

Watch this Scientific Journal Video about Intravital Imaging of Neutrophil Priming Using IL-1ÃŽÂ² Promoter-driven DsRed Reporter Mice at JoVE.com

Intravital Imaging of Neutrophil Priming Using IL-1ÃƒÅ½Ã‚Â² Promoter-driven DsRed Reporter Mice

This current protocol employs fluorescent reporters, in vivo labeling, and intravital imaging techniques to enable monitoring of the dynamic process of neutrophil priming in living animals.

Intravital Imaging of Neutrophil Priming Using IL-1&#946; Promoter-driven DsRed Reporter Mice

Neutrophils are the most abundant leukocytes in human blood circulation and are quickly recruited to inflammatory sites. Priming is a critical event that ...

Research

JoVE Journal

Immunology and Infection

Tracking Neutrophil Intraluminal Crawling, Transendothelial Migration and Chemotaxis in Tissue by Intravital Video Microscopy

The recruitment of circulating leukocytes from blood stream to the inflamed tissue is a crucial and complex process of inflammation1,2. In the ...

Intravital Imaging of the Mouse Thymus using 2-Photon Microscopy

Two-photon Microscopy (TPM) provides image acquisition in deep areas inside tissues and organs. In combination with the development of new stereotactic ...

Intravital Imaging of the Mouse Popliteal Lymph Node

Lymph nodes (LNs) are secondary lymphoid organs, which are strategically located throughout the body to allow for trapping and presentation of foreign ...

Highly Resolved Intravital Striped-illumination Microscopy of Germinal Centers

Monitoring cellular communication by intravital deep-tissue multi-photon microscopy is the key for understanding the fate of immune cells within thick ...

Long Term Intravital Multiphoton Microscopy Imaging of Immune Cells in Healthy and Diseased Liver Using CXCR6.Gfp Reporter Mice

Liver inflammation as a response to injury is a highly dynamic process involving the infiltration of distinct subtypes of leukocytes including monocytes, ...

Imaging Neutrophils and Monocytes in Mesenteric Veins by Intravital Microscopy on Anaesthetized Mice in Real Time

Efficient immune response is dependent on rapid mobilization of blood leukocytes to the site of infection or injury. Investigating leukocyte migration in ...

Visualization of IL-22-expressing Lymphocytes Using Reporter Mice

Reporter mice have been widely used to observe the localization of expression of targeted genes. This protocol focuses on a strategy to establish a new ...

Imaging the Neutrophil Phagosome and Cytoplasm Using a Ratiometric pH Indicator

Neutrophils are crucial to host innate defense and, consequently, constitute an important area of medical research. The phagosome, the intracellular ...

Imaging Mycobacterium tuberculosis in Mice with Reporter Enzyme Fluorescence

Imaging Mycobacterium tuberculosis in Mice with Reporter Enzyme Fluorescence

Reporter enzyme fluorescence (REF) utilizes substrates that are specific for enzymes present in target organisms of interest for imaging or detection by ...

Imaging Cell Interaction in Tracheal Mucosa During Influenza Virus Infection Using Two-photon Intravital Microscopy

The analysis of cell-cell or cell-pathogen interaction in vivo is an important tool to understand the dynamics of the immune response to infection. ...