isolation, digestion, filtration and cell plating of murine adipose tissue

小鼠白色脂肪组织的半自动分离

Adipose tissue biology has been attracting ever-increasing attention because of the growing prevalence of obesity and type 2 diabetes globally1. Adipocytes store excess energy in the form of lipid droplets, which are released upon starvation. Moreover, adipose tissue maintains systemic energy homeostasis by serving as an endocrine organ and communicating with other tissues2,3. Intriguingly, both excess adipose tissue (obesity) and adipose loss (lipodystrophy) are linked to insulin resistance and diabetes1. Adipocytes are divided into three types: white, brown, and beige1. White adipocytes mainly store excess energy as lipids, whereas brown and beige adipocytes dissipate energy in the form of heat via mitochondrial uncoupling protein-1 (Ucp1)1,4. Notably, beige adipocytes (also called &#34;inducible&#34; brown adipocytes) appear in white adipose tissue in response to cold or sympathetic stimulation and exhibit gene expression patterns that overlap with but are distinct from those of &#34;classical&#34; brown adipocytes5. Recently, brown and beige adipocytes have been anticipated as potential targets of anti-obesity and anti-diabetes treatments aimed at &#34;enhancing energy dissipation&#34; rather than &#34;suppressing energy intake&#34;4. Supportively, the risk allele of the FTO obesity variant rs1421085 in humans, which exhibits the strongest association with higher body mass index (BMI) among common variants6,7 and exhibits various gene-environment interactions8,9, is reported to negatively regulate beige adipocyte differentiation and function10. Peroxisome proliferator-activated receptor &#947; (PPAR&#947;) is known as a master transcriptional regulator of adipogenesis and is necessary and sufficient for adipocyte differentiation11. Transcriptional regulators, such as PRD1-BF1-RIZ1 homologous domain containing 16 (PRDM16), early b cell factor 2 (EBF2), and nuclear factor I-A (NFIA), are crucial for brown and beige adipocyte differentiation and function12,13,14,15,16,17,18. On the other hand, white adipocyte gene programming requires transcriptional regulators, such as transducin-like enhancer protein 3 (TLE3) and zinc finger protein 423 (ZFP423)19,20,21.
In vitro model systems enable molecular studies to be performed that aim to improve the understanding of the mechanism(s) underlying the functions and dysfunctions of adipocytes. Although publicly available and immortalized preadipocyte cell lines such as 3T3-L1 and 3T3-F442A exist22,23,24, the culture of primary preadipocytes and differentiation into adipocytes would be a more suitable model for studying in vivo adipogenesis. Isolation of the stromal vascular fraction (SVF) from murine adipose tissue is a well-known method for obtaining primary preadipocytes25,26. However, collagenase digestion of adipose tissue, which is commonly performed using a bacterial shaker with a tube rack, can result in experimental variation and is prone to contamination27,28. Here, we describe an alternative protocol that uses a gentle magnetic-activated cell sorting (MACS) tissue dissociator for collagenase digestion to achieve easier isolation of the SVF.

作者聚焦：使用组织解离剂从小鼠白色脂肪组织中半自动分离基质血管组分  

使用组织解离器从小鼠白色脂肪组织中半自动分离基质血管部分

We are interested in brown and beige subtypes of adipocyte which dissipate energy in the form of heat, while white adipocyte generally store energy as Our goal is to develop a new treatment for obesity and diabetes based on promotion of energy expenditure, rather than suppression of energy intake. We have identified a transcription factor, NFI, as a critical regulator of brown adipocyte differentiation by a genome-wide open chromatin analysis. NFI and the master transcriptional regulator of adipogenesis, PPAR-gamma, co-localize as the brown-fat-specific enhancers.In the process of isolating stromal vascular fraction from mouse adipose tissue, manual mincing and collagenase digestion of adipose tissue can lead to experimental variability and contamination. Our method uses a tissue dissociator for collagenase digestion, which facilitates SVF isolation, reduce experimental variability and contamination, and improves reproducibility. Experiment using individually-differentiated adipocyte are indispensable for research in our field.Our protocol would offer easy and reproducible SVF isolation for subsequent adipocyte differentiation and would accelerate research in our community. Currently, we are investigating the role of NFI of all-body metabolism, such as body weight and glucose, using gain and loss of function mouse models. We will also explore other pharmacological activation of NFI for each downstream pathway in near future.

Watch this Scientific Journal Video about Isolation, Digestion, Filtration and Cell Plating of Murine Adipose Tissue at JoVE.com

Isolation, Digestion, Filtration and Cell Plating of Murine Adipose Tissue  

小鼠脂肪组织的分离、消化、过滤和细胞接种

首先将一只七到八周大的安乐死雄性小鼠放在干净的工作台表面上。用一把剪刀将小鼠的腹部皮肤切向小腹。从大腿内侧切除脂肪组织。将切除的组织放入含有2.5毫升酶D，R，A和2.35毫升DMEM / F12的酶混合物的冰上，不含FBS或抗生素。用剪刀将脂肪组织切成大约两平方毫米大小的碎片。紧紧关闭管C的盖子并倒置管子。将管连接到组织解离器的套筒上，并在37摄氏度下消化样品40分钟。接下来，将含有FBS和抗生素的DMEM / F12培养基预热至37摄氏度。孵育后，从组织解离器中取出试管C，并通过加入5毫升带有FBS和抗生素的DMEM / F12停止消化。轻轻移液四次。在20摄氏度下以700g离心悬浮液10分钟。在不干扰细胞调色板的情况下，小心地吸出上清液。将沉淀重悬于含有FBS和抗生素的10毫升DMEM / F12中，并轻轻移液五次。通过放置在50毫升管上的70微米直径细胞过滤器过滤细胞悬液。将滤液以250g离心五分钟。将沉淀重悬于10毫升PBS中。在接种之前，将细胞悬液以500g离心五分钟。弃去上清液。将沉淀重悬于含有FBS和抗生素的10毫升DMEM / F12中。轻轻移液悬浮液混合，10次。将10毫升悬浮液放在10厘米的胶原蛋白涂层培养皿上。将培养皿放入细胞培养箱中。吸出培养基，每次洗涤用三毫升PBS洗涤细胞三次。加入 10 毫升含有 FBS 和抗生素的 DMEM/F12 并孵育。油红O染色显示诱导脂肪细胞分化7天后脂肪细胞含量高。通过脂肪生成调节因子的mRNA表达分析证实了完全分化的程度。罗格列酮诱导对棕色脂肪特异性基因如Ucp1和Ppargc1a的表达水平的剂量依赖性影响。然而，对于Fabp4，在0.1微摩尔罗格列酮浓度下饱和的效果。分化的脂肪细胞可用于各种功能和机理分析，例如耗氧率分析和染色质免疫沉淀。

isolation-digestion-filtration-cell-plating-murine-adipose

Research

JoVE Journal

Biology

Isolation, Digestion, Filtration and Cell Plating of Murine Adipose Tissue

509 次观看.  The University of Tokyo. 首先将一只七到八周大的安乐死雄性小鼠放在干净的工作台表面上。用一把剪刀将小鼠的腹部皮肤切向小腹。从大腿内侧切除脂肪组织。将切除的组织放入含有2.5毫升酶D，R，A和2.35毫升DMEM / F12的酶混合物的冰上，不含FBS或抗生素。用剪刀将脂肪组织切成大约两平方毫米大小的碎片。紧紧关闭管C的盖子并倒置管子。将管连接到组织解离器的套筒上，并在37摄氏度下?...

视频: Isolation, Digestion, Filtration and Cell Plating of Murine Adipose Tissue  

Semi-Automated Isolation of the Stromal Vascular Fraction from Murine White Adipose Tissue Using a Tissue Dissociator

The in vitro study of white, brown, and beige adipocyte differentiation enables the investigation of cell-autonomous functions of adipocytes and their mechanisms. Immortalized white preadipocyte cell lines are publicly available and widely used. However, the emergence of beige adipocytes in white adipose tissue in response to external cues is difficult to recapitulate to the full extent using publicly available white adipocyte cell lines. Isolation of the stromal vascular fraction (SVF) from murine adipose tissue is commonly executed to obtain primary preadipocytes and perform adipocyte differentiation. However, mincing and collagenase digestion of adipose tissue by hand can result in experimental variation and is prone to contamination. Here, we present a modified semi-automated protocol that utilizes a tissue dissociator for collagenase digestion to achieve easier isolation of the SVF, with the aim of reducing experimental variation, reducing contamination, and increasing reproducibility. The obtained preadipocytes and differentiated adipocytes can be used for functional and mechanistic analyses.

This protocol describes the semi-automated isolation of the stromal vascular fraction (SVF) from murine adipose tissue to obtain preadipocytes and achieve adipocyte differentiation in vitro. Using a tissue dissociator for collagenase digestion reduces experimental variation and increases reproducibility.

The in vitro study of white, brown, and beige adipocyte differentiation enables the investigation of cell-autonomous functions of adipocytes and their ...

科研

生物学

Begin by placing a seven to eight week old euthanized male mouse on a clean bench surface. Cut the abdominal skin of the mouse with a pair of scissors towards the lower abdomen. Excise the adipose tissue from the inner thighs.Place the excised tissue into tube C on ice containing 2.5 milliliters of an enzyme mixture of enzymes D, R, A and 2.35 milliliters of DMEM/F12 without FBS or antibiotics. Using scissors, cut the adipose tissue into approximately two square millimeter sized pieces. Tightly close the cap of tube C and invert the tube.Attach the tube to the sleeve of a tissue dissociator and digest the samples at 37 degrees Celsius for 40 minutes. Next, prewarm DMEM/F12 media containing FBS and antibiotics to 37 degrees Celsius. After incubation, remove tube C from the tissue dissociator and stop digestion by adding five milliliters of DMEM/F12 with FBS and antibiotics.Gently pipette four times. Centrifuge the suspension at 700 g for 10 minutes at 20 degrees Celsius. Without disturbing the cell palette, carefully aspirate the supernatant.Resuspend the pellet in 10 milliliters of DMEM/F12 containing FBS and antibiotics, and gently pipette five times. Filter the cell suspension through a 70 micron diameter cell strainer placed on a 50 milliliter tube. Centrifuge the filtrate at 250 g for five minutes.Resuspend the pellet in 10 milliliters of PBS. Before plating, centrifuge the cell suspension at 500 g for five minutes. Discard the supernatant.Resuspend the pellet in 10 milliliters of DMEM/F12 containing FBS and antibiotics. Mix by pipetting the suspension gently, 10 times. Plate 10 milliliters of the suspension on a 10 centimeter collagen coated dish.Place the dish in a cell culture incubator. Aspirate the medium and wash the cells three times with three milliliters of PBS per wash. Add 10 milliliters of DMEM/F12 containing FBS and antibiotics and incubate.Oil Red O staining showed lipid laden adipocytes seven days after inducing adipocyte differentiation. The degree of full differentiation was confirmed by mRNA expression analysis of adipogenesis regulators. Rosiglitazone induced a dose dependent effect on the expression levels of brown fat specific genes such as Ucp1 and Ppargc1a.However, for Fabp4, the effect saturated at 0.1 micromole rosiglitazone concentration. Differentiated adipocytes can be used for various functional and mechanistic analyses such as oxygen consumption rate analysis and chromatin immunoprecipitation.