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Liyanagamage DSNK, McColl LK, Glasgow LNM, Levine AS, Olszewski PK. Effect of intranasal oxytocin on palatable food consumption and c-Fos immunoreactivity in relevant brain areas in rats. Physiol Behav 2023; 271:114318. [PMID: 37543105 DOI: 10.1016/j.physbeh.2023.114318] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/01/2023] [Revised: 08/01/2023] [Accepted: 08/02/2023] [Indexed: 08/07/2023]
Abstract
Peripheral and central injections of oxytocin (OT) in laboratory animals decrease eating for energy and palatability, but the hypophagic response is dependent on the administration route. Human studies rely on intranasal (IN) administration of the peptide, the route underutilized in OT animal feeding studies thus far. Therefore, we examined the effect of IN OT on various aspects of food consumption in rats: (a) overnight deprivation-induced standard chow intake, (b) episodic (2-h) consumption of calorie-dense and palatable high-fat high-sugar (HFHS) chow, (c) 2-h episodic intake of palatable and calorie-dilute sucrose and Intralipid solutions, and (d) 2-h sucrose solution intake in rats habituated to ingesting this solution daily for several weeks. Finally, we assessed c-Fos changes in response to the acute IN OT administration in rats habituated to daily sugar consumption. We found that IN 20μg OT decreased deprivation-induced intake of standard chow and HFHS chow in nondeprived rats without affecting water consumption. IN OT also reduced 2-hour episodic fluid consumption of sucrose, but not Intralipid. In the habitual sugar consumption paradigm, acute IN OT diminished sucrose solution intake in animals accustomed to the 2-hour/day sucrose meal regimen. In rats habitually consuming sucrose, IN OT altered c-Fos immunoreactivity in brain areas related to energy homeostasis and reward, including the central nucleus of the amygdala, the hypothalamic paraventricular and the arcuate nuclei. We conclude that IN OT is an effective appetite suppressant for carbohydrate/sugar diets in rats and its effects involve feeding-related brain circuits.
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Affiliation(s)
| | - Laura K McColl
- Faculty of Science and Engineering, University of Waikato, Hamilton 3240, New Zealand
| | - Lisa N M Glasgow
- Faculty of Science and Engineering, University of Waikato, Hamilton 3240, New Zealand
| | - Allen S Levine
- Department of Food Science and Nutrition, University of Minnesota, St. Paul, MN 55108, United States of America
| | - Pawel K Olszewski
- Faculty of Science and Engineering, University of Waikato, Hamilton 3240, New Zealand; Department of Food Science and Nutrition, University of Minnesota, St. Paul, MN 55108, United States of America; Department of Integrative Biology and Physiology, Medical School, University of Minnesota, Minneapolis, MN 55414, United States of America.
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Olszewski PK, Noble EE, Paiva L, Ueta Y, Blevins JE. Oxytocin as a potential pharmacological tool to combat obesity. J Neuroendocrinol 2022; 34:e13106. [PMID: 35192207 PMCID: PMC9372234 DOI: 10.1111/jne.13106] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/04/2022] [Revised: 02/06/2022] [Accepted: 02/08/2022] [Indexed: 11/30/2022]
Abstract
The neuropeptide oxytocin (OT) has emerged as an important anorexigen in the regulation of food intake and energy balance. It has been shown that the release of OT and activation of hypothalamic OT neurons coincide with food ingestion. Its effects on feeding have largely been attributed to limiting meal size through interactions in key regulatory brain regions governing the homeostatic control of food intake such as the hypothalamus and hindbrain in addition to key feeding reward areas such as the nucleus accumbens and ventral tegmental area. Furthermore, the magnitude of an anorexigenic response to OT and feeding-related activation of the brain OT circuit are modified by the composition and flavor of a diet, as well as by a social context in which a meal is consumed. OT is particularly effective in reducing consumption of carbohydrates and sweet tastants. Pharmacologic, genetic, and pair-feeding studies indicate that OT-elicited weight loss cannot be fully explained by reductions of food intake and that the overall impact of OT on energy balance is also partly a result of OT-elicited changes in lipolysis, energy expenditure, and glucose regulation. Peripheral administration of OT mimics many of its effects when it is given into the central nervous system, raising the questions of whether and to what extent circulating OT acts through peripheral OT receptors to regulate energy balance. Although OT has been found to elicit weight loss in female mice, recent studies have indicated that sex and estrous cycle may impact oxytocinergic modulation of food intake. Despite the overall promising basic research data, attempts to use OT in the clinical setting to combat obesity and overeating have generated somewhat mixed results. The focus of this mini-review is to briefly summarize the role of OT in feeding and metabolism, address gaps and inconsistencies in our knowledge, and discuss some of the limitations to the potential use of chronic OT that should help guide future research on OT as a tailor-made anti-obesity therapeutic.
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Affiliation(s)
- Pawel K Olszewski
- Faculty of Science and Engineering, University of Waikato, Waikato, New Zealand
- Department of Food Science and Nutrition, College of Food, Agricultural and Natural Resource Sciences, University of Minnesota, St Paul, Minnesota, USA
- Department of Integrative Biology and Physiology, Medical School, University of Minnesota, Minneapolis, Minnesota, USA
| | - Emily E Noble
- Department of Nutritional Sciences, University of Georgia, Athens, Georgia, USA
| | - Luis Paiva
- Instituto de Ciencia Animal, Facultad de Ciencias Veterinarias, Universidad Austral de Chile, Valdivia, Chile
| | - Yoichi Ueta
- Department of Physiology, School of Medicine, University of Occupational and Environmental Health, Kitakyushu, Fukuoka, Japan
| | - James E Blevins
- Department of Veterans Affairs Medical Center, VA Puget Sound Health Care System, Office of Research and Development Medical Research Service, Seattle, Washington, USA
- Division of Metabolism, Endocrinology and Nutrition, Department of Medicine, University of Washington School of Medicine, Seattle, Washington, USA
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Jewett DC, Liyanagamage DSNK, Avond MAV, Anderson MAB, Twaroski KA, Marek MA, James KF, Pal T, Klockars A, Olszewski PK, Levine AS. Chronic Intermittent Sucrose Consumption Facilitates the Ability to Discriminate Opioid Receptor Blockade with Naltrexone in Rats. Nutrients 2022; 14:nu14050926. [PMID: 35267900 PMCID: PMC8912831 DOI: 10.3390/nu14050926] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/12/2022] [Revised: 02/15/2022] [Accepted: 02/18/2022] [Indexed: 12/20/2022] Open
Abstract
The opioid antagonist naltrexone (NTX) decreases intake of preferred diets in rats at very low doses relative to doses needed to decrease intake of "bland" laboratory chow. In the absence of an opioid agonist, NTX is not discriminable using operant techniques. In the current study, we found that rats given intermittent access to a 25% sucrose solution learned to discriminate between various naltrexone doses and saline. None of the rats given only water learned to discriminate between naltrexone and saline. When access to the sucrose solution was discontinued for 14 days, the rats lost the ability to discriminate between NTX and saline. We also studied the changes of c-Fos IR in selected brain regions in rats treated with saline versus NTX that were drinking water or 25% sucrose. An injection of NTX or saline resulted in a significant drug, diet, and interaction effect in various brain regions associated with feeding behavior, particularly the amygdala, accumbens, and hypothalamic sites. Thus, we found that ingestion of a sucrose solution results in the ability of rats to reliably discriminate naltrexone administration. In addition, sucrose and naltrexone altered c-Fos IR in an interactive fashion in brain regions known to be involved in ingestion behavior.
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Affiliation(s)
- David C. Jewett
- Department of Psychology, University of Wisconsin-Eau Claire, Eau Claire, WI 54701, USA; (D.C.J.); (M.A.V.A.); (M.A.B.A.); (K.A.T.); (M.A.M.); (K.F.J.)
| | - Donisha S. N. K. Liyanagamage
- Faculty of Science and Engineering, University of Waikato, Hamilton 3240, New Zealand; (D.S.N.K.L.); (T.P.); (A.K.); (P.K.O.)
| | - Mark A. Vanden Avond
- Department of Psychology, University of Wisconsin-Eau Claire, Eau Claire, WI 54701, USA; (D.C.J.); (M.A.V.A.); (M.A.B.A.); (K.A.T.); (M.A.M.); (K.F.J.)
| | - Molly A. B. Anderson
- Department of Psychology, University of Wisconsin-Eau Claire, Eau Claire, WI 54701, USA; (D.C.J.); (M.A.V.A.); (M.A.B.A.); (K.A.T.); (M.A.M.); (K.F.J.)
| | - Kyleigh A. Twaroski
- Department of Psychology, University of Wisconsin-Eau Claire, Eau Claire, WI 54701, USA; (D.C.J.); (M.A.V.A.); (M.A.B.A.); (K.A.T.); (M.A.M.); (K.F.J.)
| | - Morgan A. Marek
- Department of Psychology, University of Wisconsin-Eau Claire, Eau Claire, WI 54701, USA; (D.C.J.); (M.A.V.A.); (M.A.B.A.); (K.A.T.); (M.A.M.); (K.F.J.)
| | - Kimberly F. James
- Department of Psychology, University of Wisconsin-Eau Claire, Eau Claire, WI 54701, USA; (D.C.J.); (M.A.V.A.); (M.A.B.A.); (K.A.T.); (M.A.M.); (K.F.J.)
| | - Tapasya Pal
- Faculty of Science and Engineering, University of Waikato, Hamilton 3240, New Zealand; (D.S.N.K.L.); (T.P.); (A.K.); (P.K.O.)
| | - Anica Klockars
- Faculty of Science and Engineering, University of Waikato, Hamilton 3240, New Zealand; (D.S.N.K.L.); (T.P.); (A.K.); (P.K.O.)
| | - Pawel K. Olszewski
- Faculty of Science and Engineering, University of Waikato, Hamilton 3240, New Zealand; (D.S.N.K.L.); (T.P.); (A.K.); (P.K.O.)
- Department of Integrative Biology and Physiology, Medical School, University of Minnesota, Minneapolis, MN 55414, USA
- Department of Food Science and Nutrition, University of Minnesota, St. Paul, MN 55108, USA
| | - Allen S. Levine
- Department of Food Science and Nutrition, University of Minnesota, St. Paul, MN 55108, USA
- Correspondence:
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Head MA, McColl LK, Klockars A, Levine AS, Olszewski PK. Acute Hypophagia and Changes in c-Fos Immunoreactivity in Adolescent Rats Treated with Low Doses of Oxytocin and Naltrexone. J Clin Med 2021; 11:jcm11010059. [PMID: 35011797 PMCID: PMC8745073 DOI: 10.3390/jcm11010059] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/25/2021] [Revised: 12/14/2021] [Accepted: 12/20/2021] [Indexed: 01/19/2023] Open
Abstract
A recent case report has shown that an adjunctive oxytocin + naltrexone (OT + NTX) treatment promoted more robust hypophagia and body weight reduction than OT alone in an adolescent male with hypothalamic obesity after craniopharyngioma resection. Thus far, there has been no basic research in adolescent laboratory animals that would examine whether the benefit of OT + NTX on appetite extends onto adolescent individuals without surgically induced overeating. Thus, here we examined whether low doses of combined OT + NTX acutely affect post-deprivation intake of energy-dense, standard chow; intake of energy-dense and palatable high-fat high-sugar (HFHS) diet; or calorie-dilute, palaTable 10% sucrose solution without deprivation in adolescent male rats. We assessed whether OT + NTX decreases water intake after water deprivation or produces a conditioned taste aversion (CTA). Finally, by using c-Fos immunoreactivity, we determined changes in activity of feeding-related brain areas after OT + NTX. We found that individual subthreshold doses of OT and NTX decreased feeding induced by energy and by palatability. Significant c-Fos changes were noted in the arcuate and dorsomedial hypothalamic nuclei. The hypophagic doses of OT + NTX did not suppress water intake in thirsty rats and did not cause a CTA, which suggests that feeding reduction is not a secondary effect of gastrointestinal discomfort or changes in thirst processing. We conclude that OT + NTX is an effective drug combination to reduce appetite in adolescent male rats.
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Affiliation(s)
- Mitchell A. Head
- Faculty of Science and Engineering, University of Waikato, Hamilton 3214, New Zealand; (M.A.H.); (L.K.M.); (A.K.)
| | - Laura K. McColl
- Faculty of Science and Engineering, University of Waikato, Hamilton 3214, New Zealand; (M.A.H.); (L.K.M.); (A.K.)
| | - Anica Klockars
- Faculty of Science and Engineering, University of Waikato, Hamilton 3214, New Zealand; (M.A.H.); (L.K.M.); (A.K.)
| | - Allen S. Levine
- Department of Food Science and Nutrition, University of Minnesota, St. Paul, MN 55113, USA;
| | - Pawel K. Olszewski
- Faculty of Science and Engineering, University of Waikato, Hamilton 3214, New Zealand; (M.A.H.); (L.K.M.); (A.K.)
- Department of Food Science and Nutrition, University of Minnesota, St. Paul, MN 55113, USA;
- Department of Integrative Biology and Physiology, Medical School, University of Minnesota, Minneapolis, MN 55416, USA
- Correspondence:
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Niu J, Tong J, Blevins JE. Oxytocin as an Anti-obesity Treatment. Front Neurosci 2021; 15:743546. [PMID: 34720864 PMCID: PMC8549820 DOI: 10.3389/fnins.2021.743546] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/18/2021] [Accepted: 09/16/2021] [Indexed: 12/19/2022] Open
Abstract
Obesity is a growing health concern, as it increases risk for heart disease, hypertension, type 2 diabetes, cancer, COVID-19 related hospitalizations and mortality. However, current weight loss therapies are often associated with psychiatric or cardiovascular side effects or poor tolerability that limit their long-term use. The hypothalamic neuropeptide, oxytocin (OT), mediates a wide range of physiologic actions, which include reproductive behavior, formation of prosocial behaviors and control of body weight. We and others have shown that OT circumvents leptin resistance and elicits weight loss in diet-induced obese rodents and non-human primates by reducing both food intake and increasing energy expenditure (EE). Chronic intranasal OT also elicits promising effects on weight loss in obese humans. This review evaluates the potential use of OT as a therapeutic strategy to treat obesity in rodents, non-human primates, and humans, and identifies potential mechanisms that mediate this effect.
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Affiliation(s)
- JingJing Niu
- VA Puget Sound Health Care System, Office of Research and Development, Medical Research Service, Department of Veterans Affairs Puget Sound Health Care System, Seattle, WA, United States.,Division of Metabolism, Endocrinology and Nutrition, Department of Medicine, University of Washington School of Medicine, Seattle, WA, United States
| | - Jenny Tong
- VA Puget Sound Health Care System, Office of Research and Development, Medical Research Service, Department of Veterans Affairs Puget Sound Health Care System, Seattle, WA, United States.,Division of Metabolism, Endocrinology and Nutrition, Department of Medicine, University of Washington School of Medicine, Seattle, WA, United States
| | - James E Blevins
- VA Puget Sound Health Care System, Office of Research and Development, Medical Research Service, Department of Veterans Affairs Puget Sound Health Care System, Seattle, WA, United States.,Division of Metabolism, Endocrinology and Nutrition, Department of Medicine, University of Washington School of Medicine, Seattle, WA, United States
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Tracy AL, Temple JL. Introduction to ingestive behavior research across the generations (society for the study of ingestive behavior collection 2020). Physiol Behav 2021; 241:113561. [PMID: 34419457 DOI: 10.1016/j.physbeh.2021.113561] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
Affiliation(s)
- Andrea L Tracy
- Department of Psychology, Grinnell College, Grinnell, IA 50112, USA.
| | - Jennifer L Temple
- Department of Exercise and Nutrition Sciences, University at Buffalo, Buffalo, NY 14214, USA
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