Opinion Review Open Access
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World J Gastroenterol. May 28, 2020; 26(20): 2472-2478
Published online May 28, 2020. doi: 10.3748/wjg.v26.i20.2472
Can adiponectin have an additional effect on the regulation of food intake by inducing gastric motor changes?
Eglantina Idrizaj, Rachele Garella, Roberta Squecco, Maria Caterina Baccari
Eglantina Idrizaj, Rachele Garella, Roberta Squecco, Maria Caterina Baccari, Department of Experimental and Clinical Medicine, Section of Physiological Sciences, University of Florence, Florence 50134, Italy
ORCID number: Eglantina Idrizaj (0000-0002-2756-6552); Rachele Garella (0000-0003-3194-7603); Roberta Squecco (0000-0002-6534-3675); Maria Caterina Baccari (0000-0003-4665-1426).
Author contributions: Baccari MC conceived the paper; Idrizaj E, Garella R, Squecco R and Baccari MC contributed to writing the paper; Idrizaj E, Garella R, Squecco R and Baccari MC critically revised the manuscript and approved the final version.
Supported by the CRF Foundation, No. 2017.0777.
Conflict-of-interest statement: No conflicts of interest, financial or otherwise, are declared by the authors.
Open-Access: This article is an open-access article that was selected by an in-house editor and fully peer-reviewed by external reviewers. It is distributed in accordance with the Creative Commons Attribution NonCommercial (CC BY-NC 4.0) license, which permits others to distribute, remix, adapt, build upon this work non-commercially, and license their derivative works on different terms, provided the original work is properly cited and the use is non-commercial. See: http://creativecommons.org/licenses/by-nc/4.0/
Corresponding author: Maria Caterina Baccari, PhD, Associate Professor, Department of Experimental and Clinical Medicine, Section of Physiological Sciences, University of Florence, Viale G.B. Morgagni 63, Florence 50134, Italy. mcaterina.baccari@unifi.it
Received: December 23, 2019
Peer-review started: December 23, 2019
First decision: March 27, 2020
Revised: April 13, 2020
Accepted: May 13, 2020
Article in press: May 13, 2020
Published online: May 28, 2020


The regulation of food intake is a complex mechanism, and the hypothalamus is the main central structure implicated. In particular, the arcuate nucleus appears to be the most critical area in the integration of multiple peripheral signals. Among these signals, those originating from the white adipose tissue and the gastrointestinal tract are known to be involved in the regulation of food intake. The present paper focuses on adiponectin, an adipokine secreted by white adipose tissue, which is reported to have a role in the control of feeding by acting centrally. The recent observation that adiponectin is also able to influence gastric motility raises the question of whether this action represents an additional peripheral mechanism that concurs with the central effects of the hormone on food intake. This possibility, which represents an emerging aspect correlating the central and peripheral effects of adiponectin in the hunger-satiety cycle, is discussed in the present paper.

Key Words: Adipokines, Adiponectin, Adipose tissue, Food intake, Gastric motility, Satiety signals

Core tip: Central structures involved in the regulation of food intake receive and integrate signals from peripheral organs, including white adipose tissue. This paper summarizes the main findings on the influence of adiponectin, a pleiotropic hormone secreted by adipocytes, on food intake. In addition to its central actions, adiponectin has been recently reported to cause gastric motor changes known to be peripheral signals implicated in the hunger-satiety cycle. In this light, we discuss the potential role of adiponectin as a peripheral signal in the signaling network underlying hunger and satiety.


The regulation of food intake consists of complex signals that allow the maintenance of energy and nutrient balance. Several neurotransmitters that act at the central level are involved in energy homeostasis by regulating food intake and/or energy expenditure. A number of pathological conditions may lead to a loss of this control. This can be observed in obesity, various metabolic diseases or eating disorders, where the signaling systems that underlie appetite control are dysregulated and not yet fully clarified. Therefore, it is important to elucidate the role of any single actor in this extremely complex mechanism that could largely benefit the pathophysiology and treatment of obesity and eating disorders. However, due to the complexity of the physiological mechanisms underlying the regulation of food intake, we attempt to make a simplified synthesis of the main central structures and some of the main peripheral signals involved in the regulation of food intake to provide the reader with a better understanding of the topic discussed.


In brief, central nervous system structures, the hypothalamus in particular, are able to integrate signals of different nature through afferent and efferent pathways to and from the brainstem as well as peripheral organs[1]. The arcuate hypothalamic nucleus appears to be the most critical area in the integration of such signals, some of which are prevalently involved in the control of energy homeostasis and others related to the short-term regulation of food intake[2]. The arcuate hypothalamic nucleus contains neurons whose activation influences food intake by exerting anorexigenic or orexigenic effects. Particularly, the activation of neurons that express pro-opiomelanocortin (POMC), a precursor for many peptides, leads to a decrease in food intake. In contrast, the stimulation of adjacent neurons, which synthesize neuropeptide Y (NPY) and agouti-related peptide, is known to cause an increase in food intake. These two systems influence each other in opposite ways. The arcuate hypothalamic nucleus represents the main integrative center of signals coming either from other hypothalamic areas involved in feeding behavior (such as the paraventricular nucleus, the dorsomedial nucleus and the lateral nucleus) or from extra hypothalamic areas[3], such as the nucleus tractus solitaris. The latter receives signals from the periphery and transmits them to the hypothalamus.


There are many signals of both neural and hormonal nature that originate from the periphery and are able to modulate feeding. In particular, the gastrointestinal tract is a source of signals able to influence food intake either through the release of gut hormones or through gastrointestinal motor changes[4]. The latter could modify the activity of the vagal afferent fibers, which send signals to the hypothalamic regions through the interposition of the nucleus tractus solitaris. Gut hormones, such as cholecystokinin, glucagon-like peptide-1, ghrelin and peptide tyrosine tyrosine, can reach the brain by entering the systemic circulation and may also send signals to the central structures by stimulating receptors present on vagal afferent neurons of the gut mucosa[5].

Gastrointestinal motor changes, particularly those related to the stomach, are recognized as key mediators of the hunger-satiety cycle. Gastric accommodation as well as gastric emptying indeed play a significant role in the regulation of stomach distension[6]. The latter has been shown to trigger stretch and tension, thus stimulating mechanosensitive receptors. These, in turn, transmit their information via the afferent nerves[7,8] to several brain areas[9]. It is known that the tone of the gastric proximal portion decreases during food intake. This process of active relaxation is mediated by different parasympathetic reflex pathways, which lead to a decrease in contractile cholinergic input and an increase in nitric oxide release[10]. Several studies reported that the delay of gastric emptying, physiologically or artificially induced, and hence the dilation of the gastric wall are related to an increase in satiety feelings and fullness, leading to food intake termination[11-13]. Interestingly, obese people showed enhanced gastric emptying, whereas a subgroup of patients with anorexia nervosa had significantly delayed gastric emptying[14,15]. Moreover, several studies combining ultrasound and scintigraphy experiments found an inverse correlation between satiety and gastric distension/emptying[16-18].

Evidence exists that gastric distension-induced satiety can also be regulated by some anorexigenic gut hormones (e.g., cholecystokinin and glucagon-like peptide-1), which induce gastric distension and inhibit gastric emptying (and at the same time increase gastric compliance). Such effects on gastric motility can contribute to their effects on inducing satiety[19].

In this regard, several hormones, not only from the gastrointestinal tract but also from other organs, such as white adipose tissue (WAT), have been reported to modulate appetite in humans[20]. WAT secretes adipokines and bioactive signaling molecules[21-23]; thus, it is a part of the endocrine signaling system. This is the reason why WAT cannot be thought of as an inactive organ but rather an endocrine organ. Adipose tissue has complex interactions with the brain and peripheral organs and plays an active role in energy homeostasis and several other processes[24,25]. For instance, it controls the hunger-satiety cycle by providing hormonal signals about energy stores to the brain via adipokines. Among them, in addition to leptin, whose effects have been extensively investigated, adiponectin has also been reported to have a role in regulating feeding behavior by sending signals to the hypothalamus[26].


Among adipokines, adiponectin has recently attracted much attention because of its multiple peripheral actions: It seems to be implicated in several physiological conditions and to have a significant role in the maintenance of whole-body homeostasis[27]. Moreover, adiponectin has been reported to exert numerous beneficial effects as an antidiabetic, anti-atherosclerotic, antiapoptotic and anti-inflammatory agent in both animals and humans[28,29]. The hormone has also been shown to have a role in suppressing lipogenesis and gluconeogenesis and to increase fatty acid oxidation and energy consumption[30].

Adiponectin is one of the most concentrated hormones in plasma. However, despite its abundance, circulating adiponectin plasma concentrations change significantly[27] in a number of health and pathological conditions. In fact, a peculiar feature of adiponectin is the inverse correlation of its circulating concentrations with weight, waist circumference, body mass index and obesity[31,32]. In this regard, a significant increase in adiponectin concentration in adipose tissue and plasma has been described after caloric restriction or bariatric surgery in obese subjects[33,34]. However, the mechanisms underlying obesity-associated reductions in plasma adiponectin concentrations have not yet been elucidated in detail.

In addition to peripheral actions, adiponectin has also been reported to exert central actions in the regulation of food intake, but they are still controversial. Nonetheless, the presence of adiponectin receptors has been proven in different regions of the human brain[35,36], including the hypothalamic arcuate and lateral nuclei[37].

Adiponectin receptors (AdipoR1, AdipoR2, and T-cadherin) are indeed expressed in the brain as well as in the peripheral tissues and show different affinities for specific adiponectin isoforms, i.e., trimeric, hexameric, and high-molecular-weight multimeric isoforms[38]. Posttranslational modifications are important for the determination of adiponectin functionality since different isoforms of adiponectin exhibit different biological activities. In particular, trimeric and hexameric forms are reported to be those mainly involved in the central regulation of food intake. Hexamers and high-molecular-weight adiponectin oligomers have been proposed to bind to the T-cadherin receptor in the brain, even if their interaction remains unclear[38,39]. Although AdipoR1 and AdipoR2 are both highly expressed in various brain areas, only hypothalamic AdipoR1 has been suggested to mediate adiponectin regulation of food intake and energy expenditure in mice[35]. A simplified scheme illustrating the main central and peripheral effects of adiponectin and the related receptors involved is reported in Figure 1.

Figure 1
Figure 1 Simplified scheme summarizing some of the main adiponectin central and peripheral effects and the related receptors involved. The scheme is based on the current knowledge and illustrates our hypothesis (orange arrow) concerning an additional peripheral mechanism through which adiponectin may influence food intake at the central level. The receptor that seems to be mostly activated for the related effect is indicated in bold. 1indicates controversial results.

Whether different isoforms of adiponectin enter the brain has long been a debated issue, but recent literature has reported that numerous adipokines are indeed able to pass through the blood-brain barrier and act right on the brain[40]. Specifically, adiponectin can cross the blood-brain barrier and can also be secreted locally in the brain tissue[41], likely leading to different biological effects[38,40]. In particular, some adiponectin isoforms (trimeric and hexameric) are indeed able to reach the brain and hypothalamic centers[40] to interact with the areas that control hunger and satiety. Although this is a very exciting finding, many other aspects remain to be solved, primarily whether adiponectin exerts anorexigenic or orexigenic effects.

Notwithstanding an early observation of Qi and coworkers[42], who reported no central effects of adiponectin on food intake in mice, numerous subsequent studies indeed refer to its ability to influence feeding by acting on hypothalamic nuclei. In this view, Kubota et al[35] observed that full-length adiponectin, intravenously injected in mice, enhanced adenosine monophosphate-activated protein kinase activity in the arcuate hypothalamus[43] via AdipoR1, thus promoting food intake during fasting. Contrasting results have been reported by Coope et al[26], who demonstrated that direct intracerebroventricular injection of adiponectin in fasted rats induced a dose-related reduction in food intake. This effect was abolished following the inhibition of AdipoR1 but not AdipoR2. Coope et al[26] proposed that the discrepancy between their results and those obtained by Kubota et al[35] could be related to the different protocols employed. In fact, the perfusion of the hormone through the jugular vein[35] did not take into account that adiponectin may not be able to easily pass through the blood-brain barrier according to its different isoforms[5]. As a matter of fact, only the trimer and low-molecular-weight hexamer have been detected in the human cerebrospinal fluid, with the adiponectin trimer being the predominant oligomer[38]. This also gives a possible explanation for the lack of effects observed by Qi et al[42]. Indeed, a reduction in food intake has been recently observed following intracerebroventricular injection of adiponectin in rats[44], in agreement with the above-reported results by Coope and coworkers[26].

The effects of adiponectin on food intake and hypothalamic neuronal activity appear to also be related to different nutritional states and glucose plasma concentrations. In this view, electrophysiological experiments highlight that adiponectin inhibits NPY neurons and activates POMC neurons in a pho-sphoinositide-3-kinase-dependent and activated protein kinase-independent manner at various physiological glucose levels[45]. Two other recent studies[46,47] showed that intracerebroventricular injection of adiponectin in mice influences feeding and activates POMC neurons in relation to low or high glucose concentrations, whereas the inhibitory action on NPY neurons is glucose-independent. These results proposed an exciting new role for adiponectin as an attenuator of the effect of changes in the glucose level on POMC neuron activity and feeding behavior.

Moreover, many substances that act centrally to regulate food intake are also able to exert their effects at the gastrointestinal smooth muscle level. Among these, leptin is one of the best characterized[48]. However, notwithstanding the above-reported effects of adiponectin in the hunger-satiety cycle at the central level, no data were present in the literature about its possible peripheral effects on gastrointestinal motility until recently. The ability of the hormone to influence the mechanical responses in strips from the mouse gastric fundus has been recently reported, and the expression of both AdipoR1 and AdipoR2 receptors in these preparations has been revealed[49]. Particularly, a neuromodulatory action for the hormone has been suggested due to its ability to reduce the amplitude of the neurally induced contractile responses and to enhance that of the relaxant ones (likely through the involvement of the nitric oxide pathway). Interestingly, in addition to its neuromodulatory action, adiponectin is capable of inducing gastric motor changes through a direct relaxant effect on smooth muscle[49]. Likewise, electrophysiological investigations[50] indicate the ability of the hormone to hyperpolarize the resting membrane potential, suggesting a reduction of gastric smooth muscle cell excitability and thus an inhibitory action on excitation-contraction coupling.


All the above considerations indicate that adiponectin may have an additional effect on the regulation of food intake by inducing gastric motor changes. The depressant actions on the gastric muscle exerted by adiponectin may indeed be directed to facilitate relaxation, which may lead to gastric wall distension, known to be a peripheral satiety signal. Thus, the most attractive hypothesis is certainly that such adiponectin effects may be truly regarded as a reinforcing peripheral mechanism engaged by the hormone itself to concur with its central anorexigenic effects. Going a step further, we can speculate that the depressant actions of the hormone on gastric motility may also cause delayed gastric emptying, thus concurring with an increase in satiety feelings and fullness, leading to food intake termination. With this in mind, we can hypothesize the existence of a link between the depressant peripheral effects exerted by adiponectin at the gastric level and its central anorexigenic effects.

However, it must be remembered that most of the studies have been carried out in animals. Both central and peripheral effects of adiponectin in the regulation of food intake certainly deserve to be further investigated from a translational perspective. Dysfunction in generating signals or in the interpretation of these signals by the brain may indeed lead to obesity and/or eating disorders.


Manuscript source: Invited manuscript

Specialty type: Gastroenterology and hepatology

Country/Territory of origin: Italy

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