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preadipocyte dedifferentiation

Yuan-Yuan Fu, Kun-Lin Chen, Hui-Xia Li, Guang-Hong Zhou
The adipokine Chemerin is reported to regulate adipogenesis and glucose homeostasis in vivo and in 3T3-L1 cells. Our team is focused on the role of Chemerin in metabolism and intramuscular adipocyte differentiation because intramuscular fat is the basic material for the formation of marbling in livestock and poultry meat. In this study, bovine intramuscular mature adipocytes were cultured in medium with Chemerin, and the process of lipolysis of mature adipocytes and the adipogenesis of de-differentiated preadipocytes were investigated...
July 2016: Molecular and Cellular Biochemistry
Ziyi Song, Jia Cheng, Hao Yang, Yuefeng Li, Qian Gao, Xin'e Shi, Gongshe Yang
Ceiling culture is an inverted and closed cell culture system which represents a novel method for exploring adipocyte characteristics and function. Although the role of ceiling culture in mature adipocyte dedifferentiation has been extensively studied, its potential effects on preadipocyte differentiation remain unclear. In this study, we established a simplified dish ceiling culture method for 3T3-L1 preadipocytes and showed that our novel ceiling culture method could reproduce the function of the traditional flask ceiling culture...
May 2015: Cell Biology International
Ping Liu, Jinbo Feng, Feng Kong, Qinghua Lu, Haijia Xu, Juan Meng, Yungi Jiang
Perivascular adipocyte (PVAC) biofunctions were closely related to cardiovascular diseases; its specific biological mechanisms remained unclear. How to adjust PVAC functions of vascular cells is an important topic. The present study was designed to investigate whether FAK/Pyk2 and ERK1/2 MAPK signaling pathways participate in PVAC functions, which is activated by insulin-like growth factor 1(IGF-1) and inhibited by Gax. PVACs isolated from perivascular adipocyte were cultured, dedifferentiated, and stimulated with 10nM IGF-I...
December 2014: Cellular Signalling
Shengjuan Wei, Marcio S Duarte, Linsen Zan, Min Du, Zhihua Jiang, LeLuo Guan, Jie Chen, Gary J Hausman, Michael V Dodson
There is a voluminous amount of scientific literature dealing with the involvement of adipocytes in molecular regulation of carcass composition, obesity, metabolic syndrome, or diabetes. To form adipocytes (process termed adipogenesis) nearly all scientific papers refer to the use of preadipocytes, adipofibroblasts, stromal vascular cells or adipogenic cell lines, and their differentiation to form lipid-assimilating cells containing storage triacylglyceride. However, mature adipocytes, themselves, possess ability to undergo dedifferentiation, form proliferative-competent progeny cells (the exact plasticity is unknown) and reinitiate formation of cells capable of lipid metabolism and storage...
2013: Journal of Genomics
Liora S Katz, Elizabeth Geras-Raaka, Marvin C Gershengorn
Since individual cells from freshly isolated white adipose tissue (WAT) exhibit variable levels of fat accumulation, we attempted to determine which factor(s) cause this variation. We used primary WAT cells from adult mice and the mouse 3T3-L1 cell-line of preadipocytes for these studies. Cells were labeled with BODIPY (boron-dipyrromethene) lipid probe, a marker for fat accumulation in live cells, and sorted on a fluorescence-activated cell sorter into two populations exhibiting low or high BODIPY fluorescence intensity...
August 1, 2014: American Journal of Physiology. Endocrinology and Metabolism
Jeong Geun Park, Dae-Hee Lee, Yang Soo Moon, Kee-Hong Kim
Reversine has been reported to reverse differentiation of lineage-committed cells to mesenchymal stem cells (MSCs), which then enables them to be differentiated into other various lineages. Both adipocytes and osteoblasts are known to originate from common MSCs, and the balance between adipogenesis and osteogenesis in MSCs is reported to modulate the progression of various human diseases, such as obesity and osteoporosis. However, the role of reversine in modulating the adipogenic potential of lineage-committed preadipocytes and their plasticity to osteogenesis is unclear...
March 28, 2014: Biochemical and Biophysical Research Communications
W Sun, H Wang, Y Li, X Zhou, Y Teng, J Chen
Intramuscular fat deposition is a major contributing factor to variations in pork quality. Understanding the mechanisms driving the differentiation and metabolism of muscle-derived adipocytes is important for regulating the fat deposition in muscle. Studies on intramuscular adipocytes commonly involve stromal-vascular (SV) cell cultures, which contain preadipocytes but also several other types of primordial cells. Hence, it is crucial to obtain pure intramuscular preadipocytes for investigating adipocyte differentiation and metabolism in muscle tissue...
2013: Genetics and Molecular Research: GMR
Andrea T Deyrup, Frederic Chibon, Louis Guillou, Pauline Lagarde, Jean-Michel Coindre, Sharon W Weiss
The term "spindle cell liposarcoma" has been applied to liposarcomas (LPSs) composed predominantly or exclusively of spindled cells. These tumors have been considered variants of well-differentiated LPS (WDL), myxoid LPS, and spindle cell lipoma, suggesting that this is a heterogenous group of lesions. Using strict morphologic criteria and molecular and immunohistochemical analyses, we have identified a homogenous group of spindle cell lipomatous tumors, histologically and genetically distinct from other forms of LPS, which we have called "fibrosarcoma-like lipomatous neoplasm...
September 2013: American Journal of Surgical Pathology
Kyoung Soo Kim, Hyun-Mi Choi, Hye-In Ji, Chaekyun Kim, Jung Yeon Kim, Ran Song, So-Mi Kim, Yeon-Ah Lee, Sang-Hoon Lee, Hyung-In Yang, Myung Chul Yoo, Seung-Jae Hong
We investigated whether taurine chloramine (TauCl), which is -endogenously produced by immune cells such as macrophages that infiltrate adipose tissue, affects the differentiation of preadipocytes into adipocytes or modulates the expression of adipokines in adipocytes. To study the physiological effects of TauCl on human adipocyte differentiation and adipokine expression, preadipocytes were cultured under differentiation conditions for 14 days in the presence or the absence of TauCl. Differentiated adipocytes were also treated with TauCl in the presence or the absence of IL-1β (1 ng/ml) for 7 days...
2013: Advances in Experimental Medicine and Biology
Yunxue Guo, Yaosheng Chen, Yun Zhang, Yue Zhang, Luxi Chen, Delin Mo
Generally, most miRNAs that were up-regulated during differentiation promoted adipogenesis, but our research indicated that up-regulation of miR-145 in porcine preadipocytes did not promote but inhibit adipogenesis. In this study, miR-145 was significantly up-regulated during porcine dedifferentiated fat (DFAT) cells differentiation. In miR-145 overexpressed DFAT cells, adipogenesis was inhibited and triglycerides accumulation was decreased after hormone stimulation (P<0.05). Furthermore, up-regulation of miR-145 expression repressed induction of mRNA levels of adipogenic markers, such as CCAAT/enhancer-binding protein α (C/EBPα), and peroxisome proliferator-activated receptor γ2 (PPARγ2)...
2012: International Journal of Biological Sciences
Bu-Nam Jeon, Yeon-Sook Kim, Won-Il Choi, Dong-In Koh, Min-Kyeong Kim, Jae-Hyeon Yoon, Min-Young Kim, Benjamin Hur, Philip Dong-Hyun Paik, Man-Wook Hur
Kr-pok (kidney cancer-related POZ domain and Krüppel-like protein) is a new proto-oncogenic POZ-domain transcription factor. Fatty acid synthase gene (FASN) encodes one of the key enzymes in fatty acids synthesis and is the only enzyme that synthesizes fatty acids in cancer cells. Sp1 and SREBP-1c are the two major transcription activators of FASN. We investigated whether Kr-pok modulates transcription of the FASN. FASN expression is significantly decreased in Kr-pok knockout murine embryonic fibroblasts. Coimmunoprecipitation, GST fusion protein pull-down, and immunocytochemistry assays show that the zinc-finger domain of Kr-pok interacts directly with the bZIP DNA binding domain of SREBP-1...
April 2012: Journal of Lipid Research
Xiaoke Wang, Yan W Asmann, Michele R Erickson-Johnson, Jennifer L Oliveira, Hongying Zhang, Rafael D Moura, Alexander J Lazar, Dina Lev, Katelynn Bill, Ricardo V Lloyd, Michael J Yaszemski, Avudaiappan Maran, Andre M Oliveira
Well-differentiated liposarcoma (WDLS) is one of the most common malignant mesenchymal tumors and dedifferentiated liposarcoma (DDLS) is a malignant tumor consisting of both WDLS and a transformed nonlipogenic sarcomatous component. Cytogenetically, WDLS is characterized by the presence of ring or giant rod chromosomes containing several amplified genes, including MDM2, TSPAN31, CDK4, and others mainly derived from chromosome bands 12q13-15. However, the 12q13-15 amplicon is large and discontinuous. The focus of this study was to identify novel critical genes that are consistently amplified in primary (nonrecurrent) WDLS and with potential relevance for future targeted therapy...
November 2011: Genes, Chromosomes & Cancer
Ahmed Kablan, Rudel A Saunders, Maria Szkudlarek-Mikho, Andrew J B Chin, Raul M Bosio, Kazuyuki Fujii, Joseph Shapiro, Khew-Voon Chin
The global increase in the incidence of obesity has emerged as one of the most serious public health risks in recent years. Despite the enormity of the obesity pandemic, there are currently only two FDA-approved therapies for its treatment and these drugs exhibit modest efficacy and have limiting side effects. Prieurianin is a plant limonoid product that deters feeding in insect larvae. We investigated in this study the effects of prieurianin on weight loss and adipogenesis. Our results showed that prieurianin causes weight loss by reducing energy intake in obese mice on high-calorie diet...
September 29, 2010: Journal of Diabetes & Metabolism
Huixia Li, Zhen Zhang, Xuan Zhou, Zhenyun Wang, Genlin Wang, Zhaoyu Han
MicroRNAs (miRNAs) are short non-coding RNA that post-transcriptionally regulates gene expression. miRNA-143 has been proposed to play a role in the differentiation of preadipocytes. However, effects and mechanism of miRNA-143 in the differentiation of mammals intramuscular adipocytes is unknown. In this study, the fibroblast-like preadipocytes were cultured from the marbling muscle tissue of holstein steers by the ceiling culture method. The in vitro studies showed that the fibroblast-like preadipocytes could differentiated into mature adipocytes with up-regulated expression of miRNA-143...
October 2011: Molecular Biology Reports
Sylvia P Poulos, Michael V Dodson, Gary J Hausman
In vitro models have been invaluable in determining the mechanisms involved in adipocyte proliferation, differentiation, adipokine secretion and gene/protein expression. The cells presently available for research purposes all have unique advantages and disadvantages that one should be aware of when selecting cells. Established cell lines, such as 3T3-L1 cells, are easier and less costly to use than freshly isolated cells, even though freshly isolated cells allow for various comparisons such as the in vitro evaluation of different in vivo conditions that may not be possible using cell lines...
October 2010: Experimental Biology and Medicine
Andrea Armani, Caterina Mammi, Vincenzo Marzolla, Matilde Calanchini, Antonella Antelmi, Giuseppe M C Rosano, Andrea Fabbri, Massimiliano Caprio
White adipose tissue (WAT) is no longer considered a depot for energy storage in the form of triglycerides, but is a secretory organ that releases factors, known as adipokines, capable of regulating several physiological processes. Alteration of WAT function with subsequent dysfunctional expression and secretion of adipokines plays a key role in the pathogenesis of obesity, diabetes, and other metabolic diseases. For this reason, a deeper understanding of the molecular mechanisms regulating adipocyte function is deemed necessary for planning strategies to treat and prevent obesity and its metabolic complications...
June 1, 2010: Journal of Cellular Biochemistry
Yoshinao Oki, Saiko Watanabe, Tuyoshi Endo, Koichiro Kano
We investigated whether de-differentiated fat (DFAT) cells, a mature adipocyte-derived preadipocyte cell line, can be induced to trans-differentiate into osteoblasts in vitro and in vivo. All-trans retinoic acid (RA) induced expression of osteoblast-specific mRNAs encoding Cbfa1/Runx2, osterix, alkaline phosphatase, osteopontin, parathyroid hormone receptor, and osteocalcin in the DFAT cells, but did not induce the expression of adipocyte-specific mRNAs encoding PPARgamma2, C/EBPalpha, and GLUT4. Moreover, alkaline phosphatase activity was expressed in DFAT cells and the cells underwent mineralization of the bone matrix in vitro...
2008: Cell Structure and Function
Lily C Chao, Steven J Bensinger, Claudio J Villanueva, Kevin Wroblewski, Peter Tontonoz
Members of the nuclear receptor 4A (NR4A) subgroup of nuclear receptors have been implicated in the regulation of glucose and lipid metabolism in insulin-sensitive tissues such as liver and skeletal muscle. However, their function in adipocytes is not well defined. Previous studies have reported that these receptors are rapidly up-regulated after treatment of 3T3-L1 preadipocytes with an adipogenic cocktail. We show here that although Nur77 expression is acutely induced by cAMP agonists in 3T3-L1 cells, it is not induced by other adipogenic stimuli, such as peroxisome proliferator-activated receptor-gamma ligands, nor is it induced during the differentiation of 3T3-F442A preadipocytes, suggesting that Nur77 induction is not an obligatory feature of preadipocyte differentiation...
December 2008: Molecular Endocrinology
Tomohiko Kazama, Masaki Fujie, Tuyoshi Endo, Koichiro Kano
We have previously reported the establishment of preadipocyte cell lines, termed dedifferentiated fat (DFAT) cells, from mature adipocytes of various animals. DFAT cells possess long-term viability and can redifferentiate into adipocytes both in vivo and in vitro. Furthermore, DFAT cells can transdifferentiate into osteoblasts and chondrocytes under appropriate culture conditions. However, it is unclear whether DFAT cells are capable of transdifferentiating into skeletal myocytes, which is common in the mesodermal lineage...
December 19, 2008: Biochemical and Biophysical Research Communications
Hiroyuki Nobusue, Tsuyoshi Endo, Koichiro Kano
We established a preadipocyte cell line from mature adipocytes obtained from subcutaneous fat tissue of green fluorescent protein (GFP) transgenic mice. The floating top layer, containing mature adipocytes, was isolated from subcutaneous fat tissue by collagenase digestion and filtration. Fluorescence-activated cell sorting and microscopic analysis revealed that the floating cell fraction comprised a highly homogeneous adipocyte population with no adipose stromal-vascular cells. Isolated mature adipocytes dedifferentiated into fibroblast-like cells and actively proliferated in ceiling culture...
June 2008: Cell and Tissue Research
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