Name: Isolation and Culture of Primary Synovial Macrophages and Fibroblasts from Murine Arthritis Tissue (Video) | JoVE
Uploaded: 2023-02-24T13:30:00
Description: Watch this Scientific Journal Video about Isolation and Culture of Primary Synovial Macrophages and Fibroblasts from Murine Arthritis Tissue at JoVE.com

The authors thank the staff at the Division of Medical Research Support, the Advanced Research Support Center (ADRES), and the members of the Division of Integrative Pathophysiology, Proteo-Science Center (PROS), Ehime University, for their technical assistance and helpful support. This study was supported in part by the Japan Society for the Promotion of Science (JSPS) KAKENHI grants JP17K17929, JP19K16015, JP21K05974 (to NS) and JP23689066, JP15H04961, JP15K15552, JP17K19728, JP19H03786 (to YI); grants from the Osaka Medical Research Foundation for Intractable Diseases, The Nakatomi Foundation, The Japanese Society for Bone and Mineral Research (JSBMR) Rising Stars Grant, The Sumitomo Foundation, SENSHIN Medical Research Foundation, The Mochida Memorial Foundation (to NS); and a Takeda Science Foundation Medical Research grant, UCB Japan (UCBJ) project grant, and the JSBMR&#160;Frontier Scientist grant 2019 (to YI).

Experiments involving animals were approved by the Animal Experiment Committee of Ehime University and were performed in accordance with Ehime University Guidelines for Animal Experiments (37A1-1*16).
1. Preparation of instruments, reagents, and culture medium
<ol>
	<li>Prepare the culture medium as follows: supplement Dulbecco&#39;s Modified Eagle Medium (DMEM) with 10% fetal bovine serum (FBS) and 1% antibiotic-antimycotic solution (anti-anti).</li>
	<li>Prepare the digest...

Unveiling Inflammatory Arthritis&#58; Exploring Functions of Synovial Cells

<ol>
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This method developed here improves upon previous techniques for isolating both SFs from murine arthritis and resident macrophages from a number of organs7,11. The modified method can isolate both macrophages and fibroblasts from inflammatory synovium with high purity, and it is simple and reproducible. Since the method does not require complex instruments such as a cell sorter, anyone can conduct it. In addition, the present technique avoids concerns associated ...

Rheumatoid arthritis (RA) is an autoimmune disease characterized by hyperplasia of the synovium, leading to joint destruction1,2. Tissue-resident macrophages and fibroblasts are present in healthy synovium to maintain joint homeostasis. In RA patients, synovial fibroblasts (SFs) proliferate, and immune cells, including monocytes, infiltrate into the synovium and joint fluid, processes associated with inflammation1,3,4. Synovial macrophages (SMs), which include resident macrophages and peripheral blood monocyte-derived macrophages, and SFs are aberrantly activated and have important roles in RA pathogenesis. Recent studies have suggested that cell-cell interactions between SMs and SFs contributes to both the exacerbation and remission of RA5,6. 
To understand RA pathogenesis, several rodent models of inflammatory arthritis have been used, including K/BxN serum transfer arthritis, collagen-induced arthritis, and collagen antibody-induced arthritis. Cell-based assays are generally required to clarify molecular functions in arthritis. Therefore, primary cells from animal models of arthritis have been isolated. The method to isolate SFs from murine arthritis tissue is well established, and these cells have contributed to the elucidation of molecular mechanisms in arthritis pathogenesis7,8. On the other hand, bone marrow-derived macrophages, blood monocyte-derived macrophages, and macrophage cell lines have often been used as macrophage resources for arthritis studies9,10. Since macrophages can acquire functions associated with their microenvironment, general sources of macrophages may lack responses specific to arthritis tissue. In addition, it is difficult to obtain enough synovial cells by sorting, as murine synovium is a very small tissue even in arthritis models. The lack of usage of synovial macrophages for in vitro studies has been a limitation in arthritis studies. The establishment of a protocol to isolate and expand synovial macrophages would be an advantage for the elucidation of pathological mechanisms in RA.
In the previous method to isolate SFs, SMs were discarded7. Besides that, a method to isolate and expand resident macrophages from some organs was reported11. Therefore, existing protocols were modified in combination. The modification aims to achieve the primary culture of both SMs and SFs with high purity. The overall goal of this method is to isolate and expand both SMs and SFs from murine arthritis tissue.

<table border="1" fo:keep-together.within-page="1" fo:keep-with-next.within-page="always">
	<tbody>
		<tr>
			<td>5.0 g/L Trypsin/5.3 mmol/L EDTA solution</td>
			<td>nacalai tesque</td>
			<td>35556-44</td>
			<td>Diluted with HBSS</td>
		</tr>
		<tr>
			<td>Antibiotic&#8211;antimycotic (anti/anti)</td>
			<td>Gibco</td>
			<td>15240-062</td>
			<td></td>
		</tr>
		<tr>
			<td>Butterfly needle</td>
			<td>TERUMO</td>
			<td>SV-23DLK</td>
			<td>23G</td>
		</tr>
		<tr>
			<td>Cell strainer</td>
			<td>Falcon</td>
			<td>352340</td>
			<td>40 &#181;m pore, Nylon</td>
		</tr>
		<tr>
			<td>Cellmatrix Type I-C</td>
			<td>Nitta gelatin</td>
			<td>637-00773</td>
			<td>Type I-C collagen</td>
		</tr>
		<tr>
			<td>Centriguge tube 15</td>
			<td>TPP</td>
			<td>91014</td>
			<td>15 mL tube</td>
		</tr>
		<tr>
			<td>Centriguge tube 50</td>
			<td>TPP</td>
			<td>91050</td>
			<td>50 mL tube</td>
		</tr>
		<tr>
			<td>Collagenase from C. Histolyticum</td>
			<td>Sigma</td>
			<td>C5138</td>
			<td>Type IV collagenase</td>
		</tr>
		<tr>
			<td>Dulbecco&#8217;s Modified Eagle Medium GlutaMax (DMEM)</td>
			<td>Gibco</td>
			<td>10569-010</td>
			<td></td>
		</tr>
		<tr>
			<td>Fetal bovine serum (FBS)</td>
			<td>SIGAM</td>
			<td>173012</td>
			<td>Heat inactivation was performed</td>
		</tr>
		<tr>
			<td>Hanks&#39; balanced salt solution (HBSS)</td>
			<td>Wako</td>
			<td>085-09355</td>
			<td></td>
		</tr>
		<tr>
			<td>Scissors</td>
			<td>Bio Research Center</td>
			<td>PRI28-1525A</td>
			<td></td>
		</tr>
		<tr>
			<td>Tissue culture dish 40</td>
			<td>TPP</td>
			<td>93040</td>
			<td>For cell culture</td>
		</tr>
		<tr>
			<td>Tissue culture dish 60</td>
			<td>TPP</td>
			<td>92006</td>
			<td>For cell culture</td>
		</tr>
		<tr>
			<td>Tweezers</td>
			<td>KFI</td>
			<td>1-9749-31</td>
			<td>Fine-point</td>
		</tr>
		<tr>
			<td>Tweezers</td>
			<td>Bio Research Center</td>
			<td>PRI28-1522</td>
			<td>Serrated tip</td>
		</tr>
		<tr>
			<td>ZEISS Stemi 305</td>
			<td>ZEISS</td>
			<td>STEMI305-EDU</td>
			<td>Stereomicroscope</td>
		</tr>
	</tbody>
</table>

isolation and culture of primary synovial macrophages and fibroblasts from murine arthritis tissue

Rheumatoid arthritis is an autoimmune disease that leads to chronic inflammation of joints. Synovial macrophages and synovial fibroblasts have central roles in the pathogenesis of rheumatoid arthritis. It is important to understand the functions of both cell populations to reveal the mechanisms underlying pathological progression and remission in inflammatory arthritis. In general, in vitro experimental conditions should mimic the in vivo environment as much as possible. Primary tissue-derived cells have been used in experiments characterizing synovial fibroblasts in arthritis. In contrast, in experiments investigating the biological functions of macrophages in inflammatory arthritis, cell lines, bone marrow-derived macrophages, and blood monocyte-derived macrophages have been used. However, it is unclear whether such macrophages actually reflect the functions of tissue-resident macrophages. To obtain resident macrophages, previous protocols were modified to isolate and expand both primary macrophages and fibroblasts from synovial tissue in an inflammatory arthritis mouse model. These primary synovial cells may be useful for in vitro analysis of inflammatory arthritis.

Isolation and Culture of Primary Synovial Macrophages and Fibroblasts from Murine Arthritis Tissue

Female C57BL/6 mice at 7-8 weeks of age underwent collagen antibody-induced arthritis. Macrophage-like cells and fibroblast-like cells were independently isolated from inflammatory arthritis tissue according to the procedure described above (Figure 2A,B). Macrophage-like cells were immediately used after step 5.7. Fibroblast-like cells were initially cultured to be sub-confluent after step 4.4, and then passaged to a new culture dish followed by usage. To evaluate whether SM...

Watch this Scientific Journal Video about Isolation and Culture of Primary Synovial Macrophages and Fibroblasts from Murine Arthritis Tissue at JoVE.com

Isolation and Culture of Primary Synovial Macrophages and Fibroblasts from Murine Arthritis Tissue (Video) | JoVE 

The present study provides a modified protocol to isolate synovial macrophages and fibroblasts from murine inflammatory arthritis tissue.

Rheumatoid arthritis is an autoimmune disease that leads to chronic inflammation of joints. Synovial macrophages and synovial fibroblasts have central ...