The occurrence of brown adipose tissue in the adult red squirrel (Tamiasciurus hudsonicus)

1970 ◽  
Vol 48 (1) ◽  
pp. 188-189 ◽  
Author(s):  
Michael Aleksiuk
Keyword(s):  
Electron Microscopy ◽  
Adipose Tissue ◽  
Brown Adipose Tissue ◽  
Tamiasciurus Hudsonicus ◽  
Red Squirrel ◽  
Red Squirrels ◽  
Brown Adipose

Brown adipose tissue is demonstrated to be present in adult red squirrels in the vicinity of Winnipeg, Canada. Electron microscopy revealed ultrastructure typical of this tissue in other species.

scholarly journals Comprehensive Analysis of the Characteristics and Differences in Adult and Newborn Brown Adipose Tissue (BAT): Newborn BAT Is a More Active/Dynamic BAT

Cells ◽  
2020 ◽  
Vol 9 (1) ◽  
pp. 201 ◽  
Author(s):  
Junyu Liu ◽  
Chuanhai Zhang ◽  
Boyang Zhang ◽  
Yao Sheng ◽  
Wentao Xu ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Transcription Factor ◽  
Adipose Tissue ◽  
Brown Adipose Tissue ◽  
Lipid Droplets ◽  
Uncoupling Protein ◽  
Differentially Methylated Region ◽  
Expression Levels ◽  
Obesity And Diabetes ◽  
Brown Adipose

Brown adipose tissue (BAT) plays an essential role in maintaining body temperature and in treating obesity and diabetes. The adult BAT (aBAT) and neonatal BAT (neBAT) vary greatly in capacity, but the characteristics and differences between them on the molecular level, as well as the related features of BAT as it develops post-delivery, have not yet been fully determined. In this study, we examined the morphological features of aBAT and neBAT of mice by using hematoxylin-eosin (H&E) staining, transmission electron microscopy (TEM), and scanning electron microscopy (SEM). We found that neBAT contains a smaller number and size of lipid droplets, as well as more abundant mitochondria, compared with aBAT. The dynamic morphological changes revealed that the number and size of lipid droplets increase, but the number of mitochondria gradually decrease during the post-delivery development, which consisted of some differences in RNA or protein expression levels, such as gradually decreased uncoupling protein 1 (UCP1) expression levels and mitochondrial genes, such as mitochondrial transcription factor A (Tfam). The adipocyte differentiation-related genes, such as transcription factor CCAAT enhancer-binding protein β (CEBPβ), were also continuously upregulated. Additionally, the different features of aBAT and neBAT were analyzed from the global transcription (RNA-Seq) level, which included messenger RNA (mRNA), microRNA, long non-coding RNA (lncRNA), circRNA, and DNA methylation, as well as proteins (proteomics). Differentially methylated region (DMR) analysis identified 383 hyper- and 503 hypo-methylated genes, as well as 1221 new circRNA in ne-BAT and 1991 new circRNA in a-BAT, with significantly higher expression of circRNA in aBAT compared with neBAT. Gene ontology (GO) enrichment analysis and Kyoto Encyclopedia of Genes and Genomes (KEGG) pathway analysis indicated that mitochondrial activity, protein synthesis, and cell life activity levels were higher in neBAT, and pathways related to ribosomes, spliceosomes, and metabolism were significantly activated in neBAT compared to aBAT. Collectively, this study describes the dynamic changes occurring throughout post-delivery development from the morphological, molecular and omics perspectives. Our study provides information that may be utilized in improving BAT functional activity through gene regulation and/or epigenetic regulation.

Functional characterization of human brown adipose tissue metabolism

2020 ◽  
Vol 477 (7) ◽  
pp. 1261-1286 ◽  
Author(s):  
Marie Anne Richard ◽  
Hannah Pallubinsky ◽  
Denis P. Blondin
Keyword(s):  
Adipose Tissue ◽  
Brown Adipose Tissue ◽  
Functional Characterization ◽  
Human Infants ◽  
Positron Emission ◽  
Brown Adipose ◽  
Treatment Of Obesity ◽  
And Function

Brown adipose tissue (BAT) has long been described according to its histological features as a multilocular, lipid-containing tissue, light brown in color, that is also responsive to the cold and found especially in hibernating mammals and human infants. Its presence in both hibernators and human infants, combined with its function as a heat-generating organ, raised many questions about its role in humans. Early characterizations of the tissue in humans focused on its progressive atrophy with age and its apparent importance for cold-exposed workers. However, the use of positron emission tomography (PET) with the glucose tracer [18F]fluorodeoxyglucose ([18F]FDG) made it possible to begin characterizing the possible function of BAT in adult humans, and whether it could play a role in the prevention or treatment of obesity and type 2 diabetes (T2D). This review focuses on the in vivo functional characterization of human BAT, the methodological approaches applied to examine these features and addresses critical gaps that remain in moving the field forward. Specifically, we describe the anatomical and biomolecular features of human BAT, the modalities and applications of non-invasive tools such as PET and magnetic resonance imaging coupled with spectroscopy (MRI/MRS) to study BAT morphology and function in vivo, and finally describe the functional characteristics of human BAT that have only been possible through the development and application of such tools.

Brown adipose tissue (BAT) can normalize hyperglycemia and hypertriglyceridemia in mice

2011 ◽  
Vol 6 (S 01) ◽  
Author(s):  
M Merkel ◽  
A Bartelt ◽  
K Brügelmann ◽  
J Heeren
Keyword(s):  
Adipose Tissue ◽  
Brown Adipose Tissue ◽  
Brown Adipose

The influence of thyroid dysfunction on the activity of brown adipose tissue in mice detected by [18F]FDG PET/MR

2014 ◽  
Vol 9 (S 01) ◽  
Author(s):  
K Krause ◽  
M Kranz ◽  
V Zeisig ◽  
N Klöting ◽  
K Steinhoff ◽  
...  
Keyword(s):  
Adipose Tissue ◽  
Brown Adipose Tissue ◽  
Fdg Pet ◽  
Thyroid Dysfunction ◽  
Brown Adipose ◽  
18F Fdg

P53 regulates the lipid metabolism response to metabolic stress in brown adipose tissue

2020 ◽  
Author(s):  
G Lenihan-Geels ◽  
F Garcia-Carrizo ◽  
C Li ◽  
M Oster ◽  
A Prokesch ◽  
...  
Keyword(s):  
Adipose Tissue ◽  
Lipid Metabolism ◽  
Brown Adipose Tissue ◽  
Metabolic Stress ◽  
Brown Adipose
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