scholarly journals Brown Adipose Tissue Response to Cold Stimulation Is Reduced in Girls With Autoimmune Hypothyroidism

2019 ◽  
Vol 3 (12) ◽  
pp. 2411-2426 ◽  
Author(s):  
James M Law ◽  
David E Morris ◽  
Valerie Astle ◽  
Ellie Finn ◽  
José Joaquín Muros ◽  
...  
Keyword(s):  
Adipose Tissue ◽  
Brown Adipose Tissue ◽  
Disease Process ◽  
Tissue Response ◽  
Healthy Controls ◽  
Thyroid Status ◽  
Cold Stimulation ◽  
Autoimmune Hypothyroidism ◽  
Bat Activity ◽  
Brown Adipose

Abstract Objective The interaction between thyroid status and brown adipose tissue (BAT) activation is complex. We assessed the effect of autoimmune hypothyroidism (ATD) in female children on BAT activation, measured using infrared thermography. Design Twenty-six female participants (14 with ATD and 12 healthy controls) between 5 and 17 years of age attended a single study session. Thermal images were taken of the supraclavicular region before, and after, the introduction of a cool stimulus. Results Participants with ATD had lower resting (hypothyroid, 34.9 ± 0.7°C; control, 35.4 ± 0.5°C; P = 0.03) and stimulated (hypothyroid, 35.0 ± 0.6°C; control, 35.5 ± 0.5°C; P = 0.04) supraclavicular temperatures compared with controls, but there was no difference between groups in the temperature increase with stimulation. BAT activation, calculated as the relative temperature change comparing the supraclavicular temperature to a sternal reference region, was reduced in participants with ATD (hypothyroid, 0.1 ± 0.1°C; control, 0.2 ± 0.2°C; P = 0.04). Children with ATD were frequently biochemically euthyroid due to replacement therapy, but, despite this, increased relative supraclavicular temperature was closely associated with increased TSH (r = 0.7, P = 0.01) concentrations. Conclusions Girls with ATD had an attenuated thermogenic response to cold stimulation compared with healthy controls, but, contrary to expectation, those with suboptimal biochemical control (with higher TSH) showed increased BAT activation. This suggests that the underlying disease process may have a negative effect on BAT response, but high levels of TSH can mitigate, and even stimulate, BAT activity. In summary, thyroid status is a complex determinant of BAT activity in girls with ATD.

scholarly journals Brown Adipose Tissue Activation by Cold Treatment Ameliorates Polycystic Ovary Syndrome in Rat

2021 ◽  
Vol 12 ◽  
Author(s):  
Rongcai Ye ◽  
Chunlong Yan ◽  
Huiqiao Zhou ◽  
Yuanyuan Huang ◽  
Meng Dong ◽  
...  
Keyword(s):  
Adipose Tissue ◽  
Polycystic Ovary Syndrome ◽  
Brown Adipose Tissue ◽  
Therapeutic Strategy ◽  
Polycystic Ovary ◽  
Cold Treatment ◽  
Whole Body ◽  
Ovary Syndrome ◽  
Bat Activity ◽  
Brown Adipose

Polycystic ovary syndrome (PCOS) is a common endocrine disease accompanied by energetic metabolic imbalance. Because the etiology of PCOS is complex and remains unclear, there is no effective and specific treatment for PCOS. It is often accompanied by various metabolic disorders such as obesity, insulin resistances, and others. Activated brown adipose tissue (BAT) consumes excess energy via thermogenesis, which has positive effects on energy metabolism. Our previous research and that of others indicates that BAT activity is decreased in PCOS patients, and exogenous BAT transplantation can improve PCOS rodents. Notably however, it is difficult to apply this therapeutic strategy in clinical practice. Therapeutic strategies of enhancing endogenous BAT activity and restoring whole-body endocrine homeostasis may be more meaningful for PCOS treatment. In the current study, the dehydroepiandrosterone-induced PCOS rat was exposed to low temperature for 20 days. The results show that cold treatment could reverse acyclicity of the estrous cycle and reduce circulating testosterone and luteinizing hormone in PCOS rats by activating endogenous BAT. It also significantly reduced the expression of steroidogenic enzymes as well as inflammatory factors in the ovaries of PCOS rats. Histological investigations revealed that cold treatment could significantly reduce ovary cystic follicles and increase corpus luteum, indicating that ovulation was recovered to a normal level. Concordant with these results, cold treatment also improved fertility in PCOS rats. Collectively, these findings suggest that cold treatment could be a novel therapeutic strategy for PCOS.

scholarly journals Brown adipose tissue activity is reduced in women with polycystic ovary syndrome

2019 ◽  
Vol 181 (5) ◽  
pp. 473-480 ◽  
Author(s):  
Oliveira Flávia R ◽  
Marcelo Mamede ◽  
Mariana F Bizzi ◽  
Rocha Ana Luiza L ◽  
Cláudia N Ferreira ◽  
...  
Keyword(s):  
Adipose Tissue ◽  
Waist Circumference ◽  
Polycystic Ovary Syndrome ◽  
Brown Adipose Tissue ◽  
Polycystic Ovary ◽  
Interquartile Range ◽  
Central Adiposity ◽  
Ovary Syndrome ◽  
Bat Activity ◽  
Brown Adipose

Objective To evaluate whether brown adipose tissue (BAT) activity is altered in women with polycystic ovary syndrome (PCOS), and whether BAT activity correlates with plasma levels of irisin, a myokine that can induce BAT formation. Design We performed a cross-sectional study including women with PCOS (n = 45) and a healthy control group (n = 25) matched by age and body mass index (BMI). Methods BAT activity was measured using 18F-FDG positron emission tomography-computed tomography (PET-CT) and plasma irisin levels were measured by a validated enzyme immunoassay. Results Total BAT activity was significantly reduced in women with PCOS (maximal standardized uptake value (SUVmax): median 7.4 g/mL, interquartile range 0.9–15.4) compared to controls (median 13.0 g/mL, interquartile range 4.7–18.4, P = 0.047). However, this difference was no longer significant after adjustment for waist circumference, a surrogate marker of central adiposity. In the PCOS group, BAT activity correlated negatively with BMI (Spearman’s r = −0.630, P = 0.000) and waist circumference (r = −0.592, P = 0.000) but not with plasma irisin levels. Conclusions BAT activity was reduced in women with PCOS possibly due to increased central adiposity. In PCOS women, BAT activity did not correlate with plasma irisin levels.

scholarly journals The prevalence and predictors of active brown adipose tissue in Chinese adults

2014 ◽  
Vol 170 (3) ◽  
pp. 359-366 ◽  
Author(s):  
Zhaoyun Zhang ◽  
Aaron M Cypess ◽  
Qing Miao ◽  
Hongying Ye ◽  
Chong Wee Liew ◽  
...  
Keyword(s):  
Adipose Tissue ◽  
Brown Adipose Tissue ◽  
Glucose Uptake ◽  
High Glucose ◽  
Healthy Individuals ◽  
Chinese Adults ◽  
Bat Activity ◽  
The Metabolic Syndrome ◽  
Brown Adipose ◽  
Pet Ct

ObjectivePrevious studies have shown that active brown adipose tissue (BAT) is present in adults and may play important roles in the regulation of energy homeostasis. However, nearly every study has been carried out in patients undergoing scanning for cancer surveillance (CS), whose metabolism and BAT activity may not reflect those of healthy individuals. The objective of this study was to investigate the prevalence and predictors of active BAT in Chinese adults, particularly in healthy individuals.DesignA total of 31 088 consecutive subjects aged ≥18 years who had undergone positron emission tomography/computed tomography (PET/CT) scanning of BAT were evaluated in this study.MethodsWe measured BAT activity via18F-fluorodeoxyglucose PET/CT in subjects who had undergone scanning for either a routine medical checkup (MC) or CS in Shanghai. Then, we investigated the predictors of active BAT, particularly in healthy individuals.ResultsIn both groups, the prevalence of BAT was higher in women than in men. Using a multivariate logistic analysis, we found age, sex, BMI, and high thyroid glucose uptake to be significant predictors of BAT activity in the MC group. Similarly, we found age, sex, and BMI to be significant predictors of BAT activity, but not thyroid high glucose uptake, in the CS group.ConclusionsIn Chinese adults, BAT activity inversely correlates with BMI and thyroid high glucose uptake, which reinforces the central role of brown fat in adult metabolism and provides clues to a potential means for treating the metabolic syndrome.

scholarly journals Effects of Nutrition/Diet on Brown Adipose Tissue in Humans: A Systematic Review and Meta-Analysis

Nutrients ◽  
2020 ◽  
Vol 12 (9) ◽  
pp. 2752
Author(s):  
Kelsey A. Heenan ◽  
Andres E. Carrillo ◽  
Jacob L. Fulton ◽  
Edward J. Ryan ◽  
Jason R. Edsall ◽  
...  
Keyword(s):  
Systematic Review ◽  
Adipose Tissue ◽  
Brown Adipose Tissue ◽  
Metabolic Response ◽  
Meta Analysis ◽  
Standardized Uptake Value ◽  
Cochrane Library ◽  
Bat Activity ◽  
Brown Adipose ◽  
Single Meal

Background: Brown adipose tissue (BAT) provides a minor contribution to diet-induced thermogenesis (DIT)—the metabolic response to food consumption. Increased BAT activity is generally considered beneficial for mammalian metabolism and has been associated with favorable health outcomes. The aim of the current systematic review was to explore whether nutritional factors and/or diet affect human BAT activity. Methods: We searched PubMed Central, Embase and Cochrane Library (trials) to conduct this systematic review (PROSPERO protocol: CRD42018082323). Results: We included 24 eligible papers that studied a total of 2785 participants. We found no mean differences in standardized uptake value of BAT following a single meal or after 6 weeks of L-Arginine supplementation. Resting energy expenditure (REE), however, was increased following a single meal and after supplementation of capsinoid and catechin when compared to a control condition (Z = 2.41, p = 0.02; mean difference = 102.47 (95% CI = 19.28–185.67)). Conclusions: Human BAT activity was not significantly affected by nutrition/diet. Moreover, REE was only increased in response to a single meal, but it is unlikely that this was due to increased BAT activity. BAT activity assessments in response to the chronic effect of food should be considered along with other factors such as body composition and/or environmental temperature.

Relation of Diet-Induced Thermogenesis to Brown Adipose Tissue Activity in Healthy Men

2020 ◽  
Author(s):  
Rahel Catherina Loeliger ◽  
Claudia Irene Maushart ◽  
Gani Gashi ◽  
Jaël Rut Senn ◽  
Martina Felder ◽  
...  
Keyword(s):  
Adipose Tissue ◽  
Brown Adipose Tissue ◽  
Cold Exposure ◽  
Oral Glucose ◽  
Oral Glucose Load ◽  
Glucose Load ◽  
Healthy Men ◽  
Bat Activity ◽  
Brown Adipose ◽  
Diet Induced Thermogenesis

Objective Human brown adipose tissue (BAT) is a thermogenic tissue activated by the sympathetic nervous system in response to cold. It contributes to energy expenditure (EE) and takes up glucose and lipids from the circulation. Studies in rodents suggest that BAT contributes to the transient rise in EE after food intake, so called diet-induced thermogenesis (DIT). We investigated the relationship between human BAT activity and DIT in response to glucose intake in 17 healthy volunteers. Methods We assessed DIT, cold induced thermogenesis (CIT) and maximum BAT activity at three separate study visits within two weeks. DIT was measured by indirect calorimetry during an oral glucose tolerance-test. CIT was assessed as the difference in EE after cold exposure of two hours duration as compared to warm conditions. Maximal activity of BAT was assessed by 18F-FDG-PET/MRI after cold exposure and concomitant pharmacological stimulation with Mirabegron. Results 17 healthy men (mean age 23.4 years, mean BMI 23.2 kg/m2) participated in the study. EE increased from 1908 (±181) kcal/24 hours to 2128 (±277) kcal/24 hours (p<0.0001, +11.5%) after mild cold exposure. An oral glucose load increased EE from 1911 (±165) kcal/24 hours to 2096 (±167) kcal/24 hours at 60 minutes (p<0.0001, +9.7%). The increase in EE in response to cold was significantly associated with BAT activity (R2=0.43, p=0.004). However, DIT was not associated with BAT activity (R2=0.015, p=0.64). Conclusion DIT after an oral glucose load was not associated with stimulated 18F-FDG uptake into BAT suggesting that DIT is independent from BAT activity in humans.

Hormonal regulation of malic enzyme and glucose-6-phosphate dehydrogenase in brown adipose tissue

1993 ◽  
Vol 264 (6) ◽  
pp. E874-E881 ◽  
Author(s):  
S. D. Carvalho ◽  
N. Negrao ◽  
A. C. Bianco
Keyword(s):  
Adipose Tissue ◽  
Brown Adipose Tissue ◽  
Malic Enzyme ◽  
Hormonal Regulation ◽  
Inhibitory Effect ◽  
Thyroid Status ◽  
Brown Adipose ◽  
Glucose 6 Phosphate Dehydrogenase ◽  
Dose Dependent ◽  
Intact Rats

The activities of malic enzyme (ME) and glucose-6-phosphate dehydrogenase (G-6-PDH), two NADPH-generating lipogenic enzymes, were measured in brown adipose tissue (BAT) of rats undergoing various neurohormonal manipulations. Methimazole-induced hypothyroidism doubled the activity of these two enzymes but, surprisingly, triiodothyronine (T3) given to hypothyroid rats caused a time- and dose-dependent stimulation of up to three- to fourfold. Unilateral BAT denervation modestly reduced the activity of these enzymes (approximately 30%) and failed to prevent the stimulation induced by hypothyroidism, whereas growth hormone (GH) successfully blocked this effect of hypothyroidism. Insulin stimulated both enzymes regardless of the thyroid status but failed to abolish the inhibitory effect of GH. In intact rats, cold exposure caused a time-dependent increase in the activity of both ME and G-6-PDH, which reached 5.2- and 3-fold, respectively, after 96 h. This cold-induced stimulation was not observed in hypothyroid rats, but it was restored by physiological doses of thyroxine (800 ng.100 g body wt-1.24 h-1). Replacement with T3 (300 ng.100 g body wt-1.24 h-1), in contrast, did not have this effect. In hypothyroid rats with hemidenervation of BAT, norepinephrine (NE) modestly increased ME and G-6-PDH activities in the denervated side, with little or no effect in the intact side. Receptor-saturating doses of T3 (50 micrograms.100 g body wt-1.day-1 over 48 h) stimulated two- and threefold both enzymes in both sides, reducing or obliterating the effect of denervation. The data suggest a complex neurohormonal regulation of the activity of ME and G-6-PDH in BAT.(ABSTRACT TRUNCATED AT 250 WORDS)

scholarly journals Plasma Docosahexaenoic Acid and Eicosapentaenoic Acid Concentrations Are Positively Associated with Brown Adipose Tissue Activity in Humans

Metabolites ◽  
2020 ◽  
Vol 10 (10) ◽  
pp. 388
Author(s):  
Angie S. Xiang ◽  
Corey Giles ◽  
Rebecca K.C. Loh ◽  
Melissa F. Formosa ◽  
Nina Eikelis ◽  
...  
Keyword(s):  
Adipose Tissue ◽  
Docosahexaenoic Acid ◽  
Eicosapentaenoic Acid ◽  
Brown Adipose Tissue ◽  
Cold Exposure ◽  
Surrogate Marker ◽  
Omega 3 ◽  
Bat Activity ◽  
Brown Adipose ◽  
Lipid Species

Brown adipose tissue (BAT) activation is a possible therapeutic strategy to increase energy expenditure and improve metabolic homeostasis in obesity. Recent studies have revealed novel interactions between BAT and circulating lipid species—in particular, the non-esterified fatty acid (NEFA) and oxylipin lipid classes. This study aimed to identify individual lipid species that may be associated with cold-stimulated BAT activity in humans. A panel of 44 NEFA and 41 oxylipin species were measured using mass-spectrometry-based lipidomics in the plasma of fourteen healthy male participants before and after 90 min of mild cold exposure. Lipid measures were correlated with BAT activity measured via 18F-fluorodeoxyglucose ([18F]FDG) positron emission tomography/computed tomography (PET/CT), along with norepinephrine (NE) concentration (a surrogate marker of sympathetic activity). The study identified a significant increase in total NEFA concentration following cold exposure that was positively associated with NE concentration change. Individually, 33 NEFA and 11 oxylipin species increased significantly in response to cold exposure. The concentration of the omega-3 NEFA, docosahexaenoic acid (DHA) and eicosapentaenoic acid (EPA) at baseline was significantly associated with BAT activity, and the cold-induced change in 18 NEFA species was significantly associated with BAT activity. No significant associations were identified between BAT activity and oxylipins.

scholarly journals Multimodal Imaging for the Detection of Brown Adipose Tissue Activation in Women: A Pilot Study Using NIRS and Infrared Thermography

2017 ◽  
Vol 2017 ◽  
pp. 1-6 ◽  
Author(s):  
Valentina Hartwig ◽  
Letizia Guiducci ◽  
Martina Marinelli ◽  
Laura Pistoia ◽  
Tommaso Minutoli Tegrimi ◽  
...  
Keyword(s):  
Adipose Tissue ◽  
Pilot Study ◽  
Brown Adipose Tissue ◽  
Infrared Thermography ◽  
Pharmacological Intervention ◽  
Oral Glucose ◽  
Cold Stimulation ◽  
Standard Clinical Practice ◽  
Obesity And Diabetes ◽  
Brown Adipose

Purpose. A clear link between obesity and brown adipose tissue (BAT) dysfunction has been recently demonstrated. The purpose of this pilot study is to determine if near-infrared spectroscopy (NIRS) 2D imaging together with infrared thermography (IRT) is capable of identifying thermal and vascular response in the supraclavicular (SCV) areas after the ingestion of an oral glucose load as a thermogenic stimulation. Method. We studied two groups of women (obese versus lean) for discerning their different responses. NIRS and IRT images were acquired on the neck in the left SCV region during a 3 h oral glucose tolerance test (OGTT) and immediately after a cold stimulation. Results. We detected a significant thermal response of BAT in SCV fossa in both groups. Both during OGTT and after cold stimulation, skin temperature was persistently higher in lean versus obese. This response was not coupled with changes in oxygen saturation of subcutaneous tissue in that area. Discussion and Conclusion. The results show that NIRS/IRT may be a novel, noninvasive, radiation-free, easy to use, and low-cost method for monitoring, during the standard clinical practice, the diet and pharmacological intervention which aims to stimulate BAT as a potential therapeutic target against obesity and diabetes.

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