Rats ; Animals ; Adipose Tissue, Brown/physiology* ; Adipose Tissue

Adipose Tissue ; physiology ; Humans ; Iran ; Medicine, Traditional ; methods ; Pericardium ; physiology

Fat accumulation has been shown to play important roles in the development of obesity-related disorders such as atherosclerosis, diabetes mellitus and hypertension. Recent studies have shown that fat tissue is not a simple energy storage organ, but exerts important endocrine functions. These are achieved predominantly through release of adipocytokines, which include several novel molecules released by adipocytes like leptin, resistin, adiponectin or visfatin, as well as some more classical cytokines released possibly by inflammatory cells, like TNF-alpha and IL-6. Adipocytokines may affect cardiovascular, hepatic, muscular and metabolic function. In this review, the recent research work of adipocytokines will be discussed.
Adipokines ; physiology ; Adiponectin ; physiology ; Adipose Tissue ; chemistry ; physiology ; Humans ; Leptin ; physiology ; Resistin ; physiology

Brown adipose tissue contributes to energy balance in humans by generating heat via the mitochondrial uncoupling of lipid oxidation. Currently it is believed that brown adipose has two origins: Myf5-negative progenitor (its source is same as that of white adipocyte) and Myf5-positive progenitor (its source is same as myocyte). Due to the different origins of brown adipocytes, they may be formed via multiple pathways which include the main pathway (by which Myf5-positive progenitors differentiate into brown adipocytes that distribute in classical locations) and alternative pathway (by which Myf5-negative progenitors differentiate into brown adipocytes that distribute in white adipose tissue).
Adipocytes ; cytology ; Adipose Tissue, Brown ; cytology ; physiology ; Humans

Adipose Tissue ; cytology ; Heart ; physiology ; Humans ; Regeneration ; Stem Cells ; cytology

The body condition score (BCS) system is a subjective scoring method of evaluating the energy reserves of dairy animals to provide better understanding of biological relationships between body fat, milk production and reproduction. This method helps in adopting the optimum management practices to derive maximum production and maintain optimum health of the livestock. In this study, a new BCS system was developed for Murrah buffaloes. The skeletal check points were identified by studying the anatomical features and amount of fat reserves in slaughtered animals. The scores were assigned from 1 to 5 based on the amount of fat reserves in slaughtered animals. A score of 1 represents least and 5 represents most amount of fat. The skeletal check points identified were ordered based on the amount of carcass fat reserves and scores assigned to prepare a preliminary BCS chart on a 1 to 5 scale at 0.25 increments. The BCS chart was further modified by eliminating the skeletal check points at which the fat reserves were less evident on palpation in most of the buffaloes and a new BCS chart on a 1 to 5 scale at 0.5 increments examining eight skeletal check points was developed. The new BCS system developed was tested for precision in 10 buffaloes for each point of the 1-5 scale by ultrasonographic measurements of body fat reserves. Ultrasonographic measurements showed that as the BCS increased, the amount of fat reserves also increased (p < 0.01), indicating that the BCS adequately reflected the amount of actual fat reserves. BCS was significantly correlated (r = 0.860) with the carcass fat reserves as well as the ultrasonographic fat reserves (r = 0.854).
Adipose Tissue/*physiology/ultrasonography ; Animals ; Body Composition/*physiology ; Buffaloes/*physiology ; Dairying ; Female

Adipose Tissue ; cytology ; physiology ; Animals ; Humans ; Leptin ; physiology ; Stromal Cells ; physiology

The AMP-activated protein kinase (AMPK) widely exists in skeletal muscle, liver, pancreas, adipose tissue and central nervous system. As a "cellular energy regulator", activation of AMPK can improve insulin resistance in various mechanisms. To overall understand the importance of AMPK in exercise, the article summarized the research progress on AMPK exercise activation in skeletal muscle, liver and adipose tissue as well as exercise improving cardiovascular insulin resistance by AMPK, and looked forward to the study future of AMPK exercise activation.
AMP-Activated Protein Kinases ; physiology ; Adipose Tissue ; physiology ; Exercise ; physiology ; Humans ; Insulin Resistance ; Liver ; physiology ; Muscle, Skeletal ; physiology

OBJECTIVEBy observing the adipogenic and angiogenic microenvironment impact on the morphology of newly generated tissue for exploring the key factors which inducing mature adipose tissue regeneration in tissue engineering model.

METHODS24 healthy 6 months' New Zealand rabbits were picked and put into four groups according to different microenvironment. Every group has 6 rabbits and divided as follows: no axial-blood supply fat flap(0 ml), granular fat only(0.6 ml), axial blood vessel only (0.05 ml), axial vascularized fat flap ((0.6 ml). We separated or combined adipogenic and angiogenic environment within these groups. After 8 weeks, samples were harvested for histologic observation including macroscopic observation, volume analysis and HE testing.

RESULTSIn granular fat group, its volume decreased by (0.25 ± 0.10) ml after 8 weeks as the shortage of blood supply and finally it could be enveloped. In axial blood vessel group, its volume increased by (0. 37 ± 0. 04) ml after 8 weeks with fibrous tissue formation as shortage of adipogenic microenvironment. The no axial-blood supply fat flap group grew into(0.12 ± 0.03) ml, which can' t support large volume adipose tissue formation because of lacking independent blood supply. Only axial vascularized fat flap model could generate mature adipose tissue in large volume(3.45 ± 0.48) ml. The number of new capillary in every group was different after 8 weeks. By counting the numbers in every single view, no axial-blood supply fat flap group 15 ± 3.5)and granular fat only group(5 ± 2.5)had a significant difference with axial vascularized fat flap group 22 ± 5) respectively.

CONCLUSIONOnly both adipogenic or angiogenic microenvironment exist could induce mature adipose tissue in large volume in tissue engineering chamber model.

Adipogenesis ; physiology ; Adipose Tissue ; physiology ; Animals ; Neovascularization, Physiologic ; Rabbits ; Regeneration ; physiology ; Surgical Flaps ; blood supply ; transplantation ; Tissue Engineering ; methods

Metabolic disorders are classified clinically as a complex and varied group of diseases including metabolic syndrome, obesity, and diabetes mellitus. Fat toxicity, chronic inflammation, and oxidative stress, which may change cellular functions, are considered to play an essential role in the pathogenetic progress of metabolic disorders. Recent studies have found that cells secrete nanoscale vesicles containing proteins, lipids, nucleic acids, and membrane receptors, which mediate signal transduction and material transport to neighboring and distant cells. Exosomes, one type of such vesicles, are reported to participate in multiple pathological processes including tumor metastasis, atherosclerosis, chronic inflammation, and insulin resistance. Research on exosomes has focused mainly on the proteins they contain, but recently the function of exosome-associated microRNA has drawn a lot of attention. Exosome-associated microRNAs regulate the physiological function and pathological processes of metabolic disorders. They may also be useful as novel diagnostics and therapeutics given their special features of non-immunogenicity and quick extraction. In this paper, we summarize the structure, content, and functions of exosomes and the potential diagnostic and therapeutic applications of exosome-associated microRNAs in the treatment of metabolic disorders.
Adipose Tissue/metabolism* ; Animals ; Exosomes/physiology* ; Humans ; Metabolic Diseases/therapy* ; MicroRNAs/physiology* ; Tumor Microenvironment