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1.
Int J Mol Sci ; 25(9)2024 Apr 25.
Article En | MEDLINE | ID: mdl-38731880

Adipose tissue is a multifunctional organ that regulates many physiological processes such as energy homeostasis, nutrition, the regulation of insulin sensitivity, body temperature, and immune response. In this review, we highlight the relevance of the different mediators that control adipose tissue activity through a systematic review of the main players present in white and brown adipose tissues. Among them, inflammatory mediators secreted by the adipose tissue, such as classical adipokines and more recent ones, elements of the immune system infiltrated into the adipose tissue (certain cell types and interleukins), as well as the role of intestinal microbiota and derived metabolites, have been reviewed. Furthermore, anti-obesity mediators that promote the activation of beige adipose tissue, e.g., myokines, thyroid hormones, amino acids, and both long and micro RNAs, are exhaustively examined. Finally, we also analyze therapeutic strategies based on those mediators that have been described to date. In conclusion, novel regulators of obesity, such as microRNAs or microbiota, are being characterized and are promising tools to treat obesity in the future.


Adipose Tissue , Obesity , Humans , Animals , Obesity/metabolism , Adipose Tissue/metabolism , Adipokines/metabolism , MicroRNAs/metabolism , MicroRNAs/genetics , Gastrointestinal Microbiome , Adipose Tissue, Brown/metabolism , Adipose Tissue, White/metabolism , Inflammation Mediators/metabolism , Energy Metabolism
2.
Mol Biol Rep ; 51(1): 631, 2024 May 09.
Article En | MEDLINE | ID: mdl-38722405

Adipokines are now well-known to regulate reproduction. Visfatin is an adipokine expressed in the hypothalamus, pituitary, ovary, uterus, and placenta of different species, and since it has been found to modulate the endocrine secretion of the hypothalamus, pituitary gland and ovary, it may be considered a novel regulator of female reproduction. Although the majority of the literature explored its role in ovarian regulation, visfatin has also been shown to regulate uterine remodeling, endometrial receptivity and embryo development, and its expression in the uterus is steroid dependent. Like other adipokines, visfatin expression and levels are deregulated in pathological conditions including polycystic ovary syndrome. Thus, the present mini-review focuses on the role of visfatin in female reproduction under both physiological and pathological conditions.


Nicotinamide Phosphoribosyltransferase , Polycystic Ovary Syndrome , Reproduction , Female , Humans , Nicotinamide Phosphoribosyltransferase/metabolism , Nicotinamide Phosphoribosyltransferase/genetics , Reproduction/physiology , Reproduction/genetics , Polycystic Ovary Syndrome/metabolism , Polycystic Ovary Syndrome/physiopathology , Animals , Ovary/metabolism , Uterus/metabolism , Cytokines/metabolism , Pregnancy , Adipokines/metabolism
3.
Mol Med Rep ; 29(6)2024 Jun.
Article En | MEDLINE | ID: mdl-38606791

Obesity reaches up to epidemic proportions globally and increases the risk for a wide spectrum of co­morbidities, including type­2 diabetes mellitus (T2DM), hypertension, dyslipidemia, cardiovascular diseases, non­alcoholic fatty liver disease, kidney diseases, respiratory disorders, sleep apnea, musculoskeletal disorders and osteoarthritis, subfertility, psychosocial problems and certain types of cancers. The underlying inflammatory mechanisms interconnecting obesity with metabolic dysfunction are not completely understood. Increased adiposity promotes pro­inflammatory polarization of macrophages toward the M1 phenotype, in adipose tissue (AT), with subsequent increased production of pro­inflammatory cytokines and adipokines, inducing therefore an overall, systemic, low­grade inflammation, which contributes to metabolic syndrome (MetS), insulin resistance (IR) and T2DM. Targeting inflammatory mediators could be alternative therapies to treat obesity, but their safety and efficacy remains to be studied further and confirmed in future clinical trials. The present review highlights the molecular and pathophysiological mechanisms by which the chronic low­grade inflammation in AT and the production of reactive oxygen species lead to MetS, IR and T2DM. In addition, focus is given on the role of anti­inflammatory agents, in the resolution of chronic inflammation, through the blockade of chemotactic factors, such as monocytes chemotractant protein­1, and/or the blockade of pro­inflammatory mediators, such as IL­1ß, TNF­α, visfatin, and plasminogen activator inhibitor­1, and/or the increased synthesis of adipokines, such as adiponectin and apelin, in obesity­associated metabolic dysfunction.


Diabetes Mellitus, Type 2 , Insulin Resistance , Metabolic Syndrome , Humans , Obesity/metabolism , Metabolic Syndrome/complications , Metabolic Syndrome/metabolism , Inflammation/metabolism , Adipokines/metabolism , Adipose Tissue/metabolism , Diabetes Mellitus, Type 2/metabolism , Inflammation Mediators/metabolism
5.
Int J Mol Sci ; 25(8)2024 Apr 13.
Article En | MEDLINE | ID: mdl-38673906

Air pollution poses a significant global health risk, with fine particulate matter (PM2.5) such as diesel exhaust particles (DEPs) being of particular concern due to their potential to drive systemic toxicities through bloodstream infiltration. The association between PM2.5 exposure and an increased prevalence of metabolic disorders, including obesity, metabolic syndrome, and type 2 diabetes mellitus (T2DM), is evident against a backdrop of rising global obesity and poor metabolic health. This paper examines the role of adipose tissue in mediating the effects of PM2.5 on metabolic health. Adipose tissue, beyond its energy storage function, is responsive to inhaled noxious stimuli, thus disrupting metabolic homeostasis and responding to particulate exposure with pro-inflammatory cytokine release, contributing to systemic inflammation. The purpose of this study was to characterize the metabolic response of adipose tissue in mice exposed to either DEPs or room air (RA), exploring both the adipokine profile and mitochondrial bioenergetics. In addition to a slight change in fat mass and a robust shift in adipocyte hypertrophy in the DEP-exposed animals, we found significant changes in adipose mitochondrial bioenergetics. Furthermore, the DEP-exposed animals had a significantly higher expression of adipose inflammatory markers compared with the adipose from RA-exposed mice. Despite the nearly exclusive focus on dietary factors in an effort to better understand metabolic health, these results highlight the novel role of environmental factors that may contribute to the growing global burden of poor metabolic health.


Adipose Tissue , Inflammation , Mitochondria , Particulate Matter , Vehicle Emissions , Animals , Vehicle Emissions/toxicity , Mitochondria/metabolism , Mitochondria/drug effects , Mice , Particulate Matter/adverse effects , Particulate Matter/toxicity , Adipose Tissue/metabolism , Adipose Tissue/drug effects , Inflammation/metabolism , Inflammation/chemically induced , Inflammation/pathology , Male , Mice, Inbred C57BL , Energy Metabolism/drug effects , Adipokines/metabolism , Air Pollutants/adverse effects , Air Pollutants/toxicity , Adipocytes/metabolism , Adipocytes/drug effects
6.
Reprod Biol Endocrinol ; 22(1): 38, 2024 Apr 04.
Article En | MEDLINE | ID: mdl-38575956

The present study aimed to examine the effects of progranulin and omentin on basic ovarian cell functions. For this purpose, we investigated the effects of the addition of progranulin and omentin (0, 0.1, 1, or 10 ng/ml) on the viability, proliferation, apoptosis and steroidogenesis of cultured rabbit ovarian granulosa cells. To determine the importance of the interrelationships between granulosa cells and theca cells, we compared the influence of progranulin and omentin on progesterone and estradiol release in cultured granulosa cells and ovarian fragments containing both granulosa cells and theca cells. Cell viability, proliferation, cytoplasmic apoptosis and release of progesterone and estradiol were measured by Cell Counting Kit-8 (CCK-8), BrdU incorporation, cell death detection, and ELISA. Both progranulin and omentin increased granulosa cell viability and proliferation and decreased apoptosis. Progranulin increased progesterone release by granulosa cells but reduced progesterone output by ovarian fragments. Progranulin decreased estradiol release by granulosa cells but increased it in ovarian fragments. Omentin reduced progesterone release in both models. Omentin reduced estradiol release by granulosa cells but promoted this release in ovarian fragments. The present observations are the first to demonstrate that progranulin and omentin can be direct regulators of basic ovarian cell functions. Furthermore, the differences in the effects of these adipokines on steroidogenesis via granulosa and ovarian fragments indicate that these peptides could target both granulosa and theca cells.


Adipokines , Progesterone , Female , Animals , Rabbits , Progesterone/metabolism , Progranulins/metabolism , Progranulins/pharmacology , Adipokines/metabolism , Adipokines/pharmacology , Ovary/metabolism , Granulosa Cells/metabolism , Estradiol/metabolism , Apoptosis , Cells, Cultured , Cell Proliferation
7.
Int Immunopharmacol ; 132: 112018, 2024 May 10.
Article En | MEDLINE | ID: mdl-38588630

Obesity is associated with insulin resistance, hypertension, and coronary artery diseases which are grouped as metabolic syndrome. Rather than being a storage for energy, the adipocytes could synthesis and secret diverse hormones and molecules, named as adipokines. Under obese status, the adipocytes are dysfunctional with excessively producing the inflammatory related cytokines, such as interleukin 1 (IL-1), IL-6, and tumor necrosis factor α (TNF-α). Concerning on the vital role of adipokines, it is proposed that one of the critical pathological factors of obesity is the dysfunctional adipocytic pathways. Among these adipokines, acylation stimulating protein, as an adipokine synthesized by adipocytes during the process of cell differentiation, is shown to activate the metabolism of triglyceride (TG) by regulating the catabolism of glucose and free fatty acid (FFA). Recent attention has paid to explore the underlying mechanism whereby acylation stimulating protein influences the biological function of adipocyte and the pathological development of obesity. In the present review, we summarized the progression of acylation stimulating protein in modulating the physiological and hormonal catabolism which affects fat distribution. Furthermore, the potential mechanisms which acylation stimulating protein regulates the metabolism of adipose tissue and the process of metabolic syndrome were also summarized.


Metabolic Syndrome , Obesity , Humans , Metabolic Syndrome/metabolism , Animals , Obesity/metabolism , Obesity/pathology , Adipocytes/metabolism , Adipocytes/pathology , Adipose Tissue/metabolism , Adipose Tissue/pathology , Adipokines/metabolism , Disease Progression
8.
Psychoneuroendocrinology ; 164: 107026, 2024 Jun.
Article En | MEDLINE | ID: mdl-38507869

BACKGROUND: Adverse childhood experiences (ACE) elevate the risk of both major depressive disorder (MDD) and metabolic diseases. The underlying pathophysiology might include alterations of adipokine levels as a consequence of ACE. In this study, we used a full-factorial design to investigate the levels of select adipokines in women with ACE-only (n = 23), MDD-only (n = 27), ACE+MDD (n = 25) and healthy controls (HC, n = 29) to identify metabolic makers associated with vulnerability and resilience of developing MDD after ACE exposure. METHODS: Serum levels of adiponectin, leptin, adiponectin-to-leptin (A/L) ratio, and retinol binding protein 4 (RBP4) were measured using enzyme-linked immunosorbent assay (ELISA). RESULTS: Adiponectin levels did not differ between groups. Individuals with vs. without MDD showed higher leptin serum concentrations. As predicted, A/L ratio indicated lower values in individuals with vs. without ACE. RBP4 showed a more nuanced pattern with reduced levels in the ACE-only and MDD-only groups compared to HC. Furthermore, the ACE-only group showed lower RBP4 concentrations compared to ACE+MDD. These results were not accounted by BMI or medication status. CONCLUSION: Our results do not support the utility of adiponectin and leptin as predictors of vulnerability or resilience of developing MDD after ACE. In contrast, RBP4 might play a role in resilience towards the development of MDD following ACE. Further research on this more recently discovered adipokine seems warranted.


Adverse Childhood Experiences , Depressive Disorder, Major , Humans , Female , Adipokines/metabolism , Leptin , Adiponectin/metabolism , Retinol-Binding Proteins, Plasma
10.
Front Endocrinol (Lausanne) ; 15: 1336543, 2024.
Article En | MEDLINE | ID: mdl-38516409

The prevalence of osteoporosis has been on the rise globally. With ageing populations, research has sought therapeutic solutions in novel areas. One such area is that of the adipokines. Current literature points to an important role for these chemical mediators in relation to bone metabolism. Well-established adipokines have been broadly reported upon. These include adiponectin and leptin. However, other novel adipokines such as visfatin, nesfatin-1, meteorin-like protein (Metrnl), apelin and lipocalin-2 are starting to be addressed pre-clinically and clinically. Adipokines hold pro-inflammatory and anti-inflammatory properties that influence the pathophysiology of various bone diseases. Omentin-1 and vaspin, two novel adipokines, share cardioprotective effects and play essential roles in bone metabolism. Studies have reported bone-protective effects of omentin-1, whilst others report negative associations between omentin-1 and bone mineral density. Lipocalin-2 is linked to poor bone microarchitecture in mice and is even suggested to mediate osteoporosis development from prolonged disuse. Nesfatin-1, an anorexigenic adipokine, has been known to preserve bone density. Animal studies have demonstrated that nesfatin-1 treatment limits bone loss and increases bone strength, suggesting exogenous use as a potential treatment for osteopenic disorders. Pre-clinical studies have shown adipokine apelin to have a role in bone metabolism, mediated by the enhancement of osteoblast genesis and the inhibition of programmed cell death. Although many investigations have reported conflicting findings, sufficient literature supports the notion that adipokines have a significant influence on the metabolism of bone. This review aims at highlighting the role of novel adipokines in osteoporosis while also discussing their potential for treating osteoporosis.


Osteoporosis , Serpins , Animals , Mice , Adipokines/metabolism , Apelin/metabolism , Lipocalin-2 , Adiponectin/metabolism , Osteoporosis/drug therapy
11.
Front Endocrinol (Lausanne) ; 15: 1340625, 2024.
Article En | MEDLINE | ID: mdl-38532900

The intervertebral disc is not isolated from other tissues. Recently, abundant research has linked intervertebral disc homeostasis and degeneration to various systemic diseases, including obesity, metabolic syndrome, and diabetes. Organokines are a group of diverse factors named for the tissue of origin, including adipokines, osteokines, myokines, cardiokines, gastrointestinal hormones, and hepatokines. Through endocrine, paracrine, and autocrine mechanisms, organokines modulate energy homeostasis, oxidative stress, and metabolic balance in various tissues to mediate cross-organ communication. These molecules are involved in the regulation of cellular behavior, inflammation, and matrix metabolism under physiological and pathological conditions. In this review, we aimed to summarize the impact of organokines on disc homeostasis and degeneration and the underlying signaling mechanism. We focused on the regulatory mechanisms of organokines to provide a basis for the development of early diagnostic and therapeutic strategies for disc degeneration.


Intervertebral Disc Degeneration , Intervertebral Disc , Humans , Adipokines/metabolism , Obesity/metabolism , Homeostasis
12.
Biochem Pharmacol ; 222: 116104, 2024 Apr.
Article En | MEDLINE | ID: mdl-38428826

Adipose tissues (AT) are an important endocrine organ that secretes various functional adipokines, peptides, non-coding RNAs, and acts on AT themselves or other distant tissues or organs through autocrine, paracrine, or endocrine manners. An accumulating body of evidence has suggested that many adipokines play an important role in liver metabolism. Besides the traditional adipokines such as adiponectin and leptin, many novel adipokines have recently been identified to have regulatory effects on the liver. Additionally, AT can produce extracellular vesicles (EVs) that act on peripheral tissues. However, under pathological conditions, such as obesity and diabetes, dysregulation of adipokines is associated with functional changes in AT, which may cause liver diseases. In this review, we focus on the newly discovered adipokines and EVs secreted by AT and highlight their actions on the liver under the context of obesity, nonalcoholic fatty liver diseases (NAFLD), and some other liver diseases. Clarifying the action of adipokines and adipose tissue-derived EVs on the liver would help to identify novel therapeutic targets or biomarkers for metabolic diseases.


Adipokines , Non-alcoholic Fatty Liver Disease , Humans , Adipokines/metabolism , Obesity/metabolism , Adipose Tissue/metabolism , Adiponectin , Non-alcoholic Fatty Liver Disease/metabolism
13.
Anticancer Res ; 44(4): 1369-1376, 2024 Apr.
Article En | MEDLINE | ID: mdl-38537999

BACKGROUND/AIM: Obesity is correlated with an increased risk of developing malignancies, including prostate cancer. Adipocytokines, such as leptin and adiponectin, are a family of hormones derived from adipose tissue that are involved not only in metabolism, but also in the development and progression of various malignancies. However, little is known about their role in prostate cancer. This study aimed to determine how leptin, adiponectin, and their receptors impact the spread of prostate cancer. MATERIALS AND METHODS: We first performed immunohistochemical analysis of prostate cancer tissue microarrays to detect leptin, leptin receptor (Ob-R), adiponectin, and adiponectin receptors 1 and 2 (AdipoR1 and AdipoR2). Wound healing assays and western blot analysis were then performed in human prostate cancer cell lines. RESULTS: Immunohistochemistry showed that prostate tissue was not significantly positive for adiponectin. However, its expression tended to decrease according to the International Society of Urological Pathology (ISUP) grade of prostate cancer (p=0.056). In prostate cancer cell lines, administration of the synthetic adiponectin AdipoRon suppressed cell migration as well as the expression of phospho-NF-[Formula: see text]B and cyclooxygenase-2, whereas leptin stimulated these effects. CONCLUSION: Adiponectin expression tended to be suppressed according to ISUP grade in prostate cancer tissues. In vitro, tumor cell migration was induced by leptin but suppressed by adiponectin. Targeting adipocytokines could be a novel treatment strategy for prostate cancer.


Leptin , Prostatic Neoplasms , Male , Humans , Leptin/metabolism , Adipokines/metabolism , Adiponectin/pharmacology , Adiponectin/metabolism , Adipose Tissue/metabolism , Prostatic Neoplasms/metabolism
14.
Reproduction ; 167(5)2024 May 01.
Article En | MEDLINE | ID: mdl-38513348

In brief: Dairy cattle experience a period of infertility postpartum that is caused in part by the development of IGF1/insulin resistance. This study suggests that an adipokine, FNDC3A, reduces IGF1-dependent glycolysis and may contribute to postpartum infertility. Abstract: Dairy cows go through a period of subfertility after parturition, triggered in part by a disruption of energy homeostasis. The mobilization of body fat alters the secretion of adipokines, which have been shown to impact ovarian function. Fibronectin type III domain-containing 3A (FNDC3A) is a recently discovered adipokine-myokine, and FNDC3A mRNA abundance in subcutaneous adipose tissue is increased postpartum in cattle. In this study, we hypothesized that FNDC3A may compromise granulosa cell function in cattle and investigated this using a well-established in vitro cell culture model. Here, we demonstrate the presence of FNDC3A protein associated with extracellular vesicles in follicular fluid and in plasma, suggesting an endocrine role for this adipokine. FNDC3A protein and mRNA was also detected in the bovine ovary (cortex, granulosa and theca cells, cumulus, oocyte and corpus luteum). Abundance of FNDC3A mRNA in granulosa cells from small follicles was increased by in vitro treatment with the adipokines leptin and TNF but not by visfatin, resistin, adiponectin, chemerin or IGF1. Addition of recombinant FNDC3A at physiological doses (10 ng/mL) to granulosa cells decreased IGF1-dependent progesterone but not estradiol secretion and IGF1-dependent lactate secretion and abundance of GLUT3 and GLUT4 mRNA. This concentration of FNDC3A increased cell viability, abundance of mRNA encoding a putative receptor FOLR1, and increased phosphorylation of Akt. Collectively, these data suggest that FNDC3A may regulate folliculogenesis in cattle by modulating IGF1-dependent granulosa cell steroidogenesis and glucose metabolism.


Granulosa Cells , Infertility , Animals , Cattle , Female , Adipokines/metabolism , Granulosa Cells/metabolism , Infertility/metabolism , Lactates/metabolism , Progesterone/metabolism , RNA, Messenger/metabolism , Folate Receptor 1/metabolism , Fibronectins/metabolism , Exosomes/genetics , Exosomes/metabolism
15.
Int J Mol Sci ; 25(5)2024 Feb 25.
Article En | MEDLINE | ID: mdl-38473909

Mutations of the FBN1 gene lead to Marfan syndrome (MFS), which is an autosomal dominant connective tissue disorder featured by thoracic aortic aneurysm risk. There is currently no effective treatment for MFS. Here, we studied the role of mitochondrial dysfunction in the phenotypic transformation of human smooth muscle cells (SMCs) and whether a mitochondrial boosting strategy can be a potential treatment. We knocked down FBN1 in SMCs to create an MFS cell model and used rotenone to induce mitochondrial dysfunction. Furthermore, we incubated the shFBN1 SMCs with Coenzyme Q10 (CoQ10) to assess whether restoring mitochondrial function can reverse the phenotypic transformation. The results showed that shFBN1 SMCs had decreased TFAM (mitochondrial transcription factor A), mtDNA levels and mitochondrial mass, lost their contractile capacity and had increased synthetic phenotype markers. Inhibiting the mitochondrial function of SMCs can decrease the expression of contractile markers and increase the expression of synthetic genes. Imposing mitochondrial stress causes a double-hit effect on the TFAM level, oxidative phosphorylation and phenotypic transformation of FBN1-knockdown SMCs while restoring mitochondrial metabolism with CoQ10 can rapidly reverse the synthetic phenotype. Our results suggest that mitochondria function is a potential therapeutic target for the phenotypic transformation of SMCs in MFS.


Marfan Syndrome , Mitochondrial Diseases , Ubiquinone/analogs & derivatives , Humans , Marfan Syndrome/genetics , Phenotype , Myocytes, Smooth Muscle/metabolism , Mitochondrial Diseases/metabolism , Fibrillin-1/metabolism , Adipokines/metabolism
16.
Environ Sci Pollut Res Int ; 31(13): 19674-19686, 2024 Mar.
Article En | MEDLINE | ID: mdl-38363509

Evidence around the relationship between air pollution and the development of diabetes mellitus (DM) remains limited and inconsistent. To investigate the potential mediation effect of asprosin on the association between fine particulate matter (PM2.5), tropospheric ozone (O3) and blood glucose homeostasis. A case-control study was conducted on a total of 320 individuals aged over 60 years, including both diabetic and non-diabetic individuals, from six communities in Taiyuan, China, from July to September 2021. Generalized linear models (GLMs) suggested that short-term exposure to PM2.5 was associated with elevated fasting blood glucose (FBG), insulin resistance index (HOMA-IR), as well as reduced pancreatic ß-cell function index (HOMA-ß), and short-term exposure to O3 was associated with increased FBG and decreased HOMA-ß in the total population and elderly diabetic patients. Mediation analysis showed that asprosin played a mediating role in the relationship of PM2.5 and O3 with FBG, with mediating ratios of 10.2% and 18.4%, respectively. Our study provides emerging evidence supporting that asprosin mediates the short-term effects of exposure to PM2.5 and O3 on elevated FBG levels in an elderly population. Additionally, the elderly who are diabetic, over 70 years, and BMI over 24 kg/m2 are more vulnerable to air pollutants and need additional protection to reduce their exposure to air pollution.


Air Pollutants , Air Pollution , Diabetes Mellitus , Fibrillin-1 , Aged , Humans , Middle Aged , Air Pollutants/adverse effects , Air Pollution/adverse effects , Blood Glucose/metabolism , Case-Control Studies , China/epidemiology , Diabetes Mellitus/metabolism , Environmental Exposure/analysis , Particulate Matter/analysis , Fibrillin-1/metabolism , Adipokines/metabolism
17.
J Physiol ; 602(5): 773-790, 2024 Mar.
Article En | MEDLINE | ID: mdl-38305477

Adipose tissue, as an endocrine organ, secretes several adipocyte-derived hormones named 'adipokines' that are implicated in regulating energy haemostasis. Substantial evidence shows that white adipose tissue-derived adipokines mediate the link between obesity-related exogenous factors (like diet and lifestyle) and various biological events (such as pre- and postmenopausal status) that have obesity consequences (cardiometabolic disorders). One of the critical aetiological factors for obesity-related diseases is the dysfunction of adipokine pathways. Acylation-stimulating protein (ASP) is an adipokine that stimulates triglyceride synthesis and storage in adipose tissue by enhancing glucose and fatty acid uptake. ASP acts via its receptor C5L2. The primary objective of this review is to address the existing gap in the literature regarding ASP by investigating its diverse responses and receptor interactions across multiple determinants of obesity. These determinants include diet composition, metabolic disorders, organ involvement, sex and sex hormone levels. Furthermore, this article explores the broader paradigm shift from solely focusing on adipose tissue mass, which contributes to obesity, to considering the broader implications of adipose tissue function. Additionally, we raise a critical question concerning the clinical relevance of the insights gained from this review, both in terms of potential therapeutic interventions targeting ASP and in the context of preventing obesity-related conditions, highlighting the potential of the ASP-C5L2 interaction as a pharmacological target. In conclusion, these findings validate that obesity is a low-grade inflammatory status with multiorgan involvement and sex differences, demonstrating dynamic interactions between immune and metabolic response determinants.


Adipocytes , Adipose Tissue , Complement C3a , Female , Humans , Male , Adipocytes/metabolism , Adipose Tissue/metabolism , Obesity/metabolism , Adipokines/metabolism
18.
Obesity (Silver Spring) ; 32(3): 560-570, 2024 Mar.
Article En | MEDLINE | ID: mdl-38247441

OBJECTIVE: The study objective was to investigate the effect of cold exposure on the plasma levels of five potential human brown adipokines (chemokine ligand 14 [CXCL14], growth differentiation factor 15 [GDF15], fibroblast growth factor 21 [FGF21], interleukin 6 [IL6], and bone morphogenic protein 8b [BMP8b]) and to study whether such cold-induced effects are related to brown adipose tissue (BAT) volume, activity, or radiodensity in young humans. METHODS: Plasma levels of brown adipokines were measured before and 1 h and 2 h after starting an individualized cold exposure in 30 young adults (60% women, 21.9 ± 2.3 y; 24.9 ± 5.1 kg/m2 ). BAT volume, 18 F-fluorodeoxyglucose uptake, and radiodensity were assessed by a static positron emission tomography-computerized tomography scan after cold exposure. RESULTS: Cold exposure increased the concentration of CXCL14 (Δ2h = 0.58 ± 0.98 ng/mL; p = 0.007), GDF15 (Δ2h = 19.63 ± 46.2 pg/mL; p = 0.013), FGF21 (Δ2h = 33.72 ± 55.13 pg/mL; p = 0.003), and IL6 (Δ1h = 1.98 ± 3.56 pg/mL; p = 0.048) and reduced BMP8b (Δ2h = -37.12 ± 83.53 pg/mL; p = 0.022). The cold-induced increase in plasma FGF21 was positively associated with BAT volume (Δ2h: ß = 0.456; R2 = 0.307; p = 0.001), but not with 18 F-fluorodeoxyglucose uptake or radiodensity. None of the changes in the other studied brown adipokines was related to BAT volume, activity, or radiodensity. CONCLUSIONS: Cold exposure modulates plasma levels of several potential brown adipokines in humans, whereas only cold-induced changes in FGF21 levels are associated with BAT volume. These findings suggest that human BAT might contribute to the circulatory pool of FGF21.


Adipokines , Adipose Tissue, Brown , Young Adult , Humans , Female , Male , Adipokines/metabolism , Adipose Tissue, Brown/diagnostic imaging , Adipose Tissue, Brown/metabolism , Interleukin-6/metabolism , Fibroblast Growth Factors/metabolism , Fluorodeoxyglucose F18/metabolism , Cold Temperature
19.
Diabetes ; 73(2): 169-177, 2024 02 01.
Article En | MEDLINE | ID: mdl-38241508

Excessive adiposity in obesity is a significant risk factor for development of type 2 diabetes (T2D), nonalcoholic fatty liver disease, and other cardiometabolic diseases. An unhealthy expansion of adipose tissue (AT) results in reduced adipogenesis, increased adipocyte hypertrophy, adipocyte hypoxia, chronic low-grade inflammation, increased macrophage infiltration, and insulin resistance. This ultimately culminates in AT dysfunction characterized by decreased secretion of antidiabetic adipokines such as adiponectin and adipsin and increased secretion of proinflammatory prodiabetic adipokines including RBP4 and resistin. This imbalance in adipokine secretion alters the physiological state of AT communication with target organs including pancreatic ß-cells, heart, and liver. In the pancreatic ß-cells, adipokines are known to have a direct effect on insulin secretion, gene expression, cell death, and/or dedifferentiation. For instance, impaired secretion of adipsin, which promotes insulin secretion and ß-cell identity, results in ß-cell failure and T2D, thus presenting a potential druggable target to improve and/or preserve ß-cell function. The cardiac tissue is affected by both the classic white AT-secreted adipokines and the newly recognized brown AT (BAT)-secreted BATokines or lipokines that alter lipid deposition and ventricular function. In the liver, adipokines affect hepatic gluconeogenesis, lipid accumulation, and insulin sensitivity, underscoring the importance of adipose-liver communication in the pathogenesis of nonalcoholic fatty liver disease. In this perspective, we outline what is currently known about the effects of individual adipokines on pancreatic ß-cells, liver, and the heart.


Diabetes Mellitus, Type 2 , Insulin Resistance , Non-alcoholic Fatty Liver Disease , Humans , Non-alcoholic Fatty Liver Disease/metabolism , Adiposity , Complement Factor D/metabolism , Diabetes Mellitus, Type 2/metabolism , Adipose Tissue/metabolism , Adipokines/metabolism , Obesity/metabolism , Adipose Tissue, Brown/metabolism , Inflammation/metabolism , Lipids , Retinol-Binding Proteins, Plasma/metabolism
20.
J Anim Physiol Anim Nutr (Berl) ; 108(1): 55-63, 2024 Jan.
Article En | MEDLINE | ID: mdl-37526207

A study was designed to evaluate the effect of Moringa oleifera, Phyllanthus amarus and Viscum album leaf meal as herbal inclusions to alleviate the detrimental outcomes of heat stress in weaned female rabbits. Forty (40) weaned rabbit does (527.99 ± 10.35 g; 28 days old) were randomly allotted to four dietary groups consisting of Diet 1(control diet; without leaf meal), Diets 2 (supplemented with 10% V. album); 3 (supplemented with 10% M. oleifera) and 4 (supplemented with 10% P. amarus) in an 84 days trial at the peak of heat stress in Southwest Nigeria. At the end of the trial, blood samples were collected to assess physiological responses and oxidative status of the rabbit does. The results obtained revealed that rabbit does were exposed to heat stress; rabbit does fed control diet had higher leucocyte and neutrophil/lymphocyte ratio compared to rabbit does fed on herbal inclusions. The herbal inclusions enhanced oxidative stability of rabbit does by lowering lipid peroxidation and enhancing antioxidant activities during heat stress conditions. Rabbit does fed control-based diet had significantly higher heat shock protein 70, leptin and adiponectin compared to rabbit does on M. oleifera, P. amarus and V. album supplemented diets. The herbal inclusions tend to suppress proinflammatory cytokines in rabbit does during heat stress condition. In conclusion, the herbal inclusions suppress inflammation, adipokines and promotes oxidative stability of rabbit does exposed to heat stress conditions.


Adipokines , Hematology , Rabbits , Female , Animals , Adipokines/metabolism , Adipokines/pharmacology , Cytokines/metabolism , Oxidative Stress , Antioxidants/metabolism , Dietary Supplements , Diet/veterinary , Heat-Shock Response
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