1
|
Misiakiewicz-Has K, Maciejewska-Markiewicz D, Szypulska-Koziarska D, Kolasa A, Wiszniewska B. The Influence of Soy Isoflavones and Soy Isoflavones with Inulin on Kidney Morphology, Fatty Acids, and Associated Parameters in Rats with and without Induced Diabetes Type 2. Int J Mol Sci 2024; 25:5418. [PMID: 38791455 PMCID: PMC11121859 DOI: 10.3390/ijms25105418] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/12/2024] [Revised: 05/08/2024] [Accepted: 05/13/2024] [Indexed: 05/26/2024] Open
Abstract
Diabetes mellitus resulting from hyperglycemia stands as the primary cause of diabetic kidney disease. Emerging evidence suggests that plasma concentrations of soy isoflavones, substances with well-established antidiabetic properties, rise following supplemental inulin administration. The investigation encompassed 36 male Sprague-Dawley (SD) rats segregated into two cohorts: non-diabetic and diabetic, induced with type 2 diabetes (high-fat diet + two intraperitoneal streptozotocin injections). Each cohort was further divided into three subgroups (n = 6): control, isoflavone-treated, and isoflavone plus inulin-treated rats. Tail blood glucose and ketone levels were gauged. Upon termination, blood samples were drawn directly from the heart for urea, creatinine, and HbA1c/HbF analyses. One kidney per rat underwent histological (H-E) and immunohistochemical assessments (anti-AQP1, anti-AQP2, anti-AVPR2, anti-SLC22A2, anti-ACC-alpha, anti-SREBP-1). The remaining kidney underwent fatty acid methyl ester analysis. Results unveiled notable alterations in water intake, body and kidney mass, kidney morphology, fatty acids, AQP2, AVPR2, AcetylCoA, SREBP-1, blood urea, creatinine, and glucose levels in control rats with induced type 2 diabetes. Isoflavone supplementation exhibited favorable effects on plasma urea, plasma urea/creatinine ratio, glycemia, water intake, and kidney mass, morphology, and function in type 2 diabetic rats. Additional inulin supplementation frequently modulated the action of soy isoflavones.
Collapse
Affiliation(s)
- Kamila Misiakiewicz-Has
- Department of Histology and Embryology, Pomeranian Medical University, Powstańców Wielkopolskich 72, 70-111 Szczecin, Poland; (D.S.-K.); (A.K.); (B.W.)
| | | | - Dagmara Szypulska-Koziarska
- Department of Histology and Embryology, Pomeranian Medical University, Powstańców Wielkopolskich 72, 70-111 Szczecin, Poland; (D.S.-K.); (A.K.); (B.W.)
| | - Agnieszka Kolasa
- Department of Histology and Embryology, Pomeranian Medical University, Powstańców Wielkopolskich 72, 70-111 Szczecin, Poland; (D.S.-K.); (A.K.); (B.W.)
| | - Barbara Wiszniewska
- Department of Histology and Embryology, Pomeranian Medical University, Powstańców Wielkopolskich 72, 70-111 Szczecin, Poland; (D.S.-K.); (A.K.); (B.W.)
| |
Collapse
|
2
|
Su WJ, Li JM, Zhang T, Cao ZY, Hu T, Zhong SY, Xu ZY, Gong H, Jiang CL. Microglial NLRP3 inflammasome activation mediates diabetes-induced depression-like behavior via triggering neuroinflammation. Prog Neuropsychopharmacol Biol Psychiatry 2023; 126:110796. [PMID: 37209992 DOI: 10.1016/j.pnpbp.2023.110796] [Citation(s) in RCA: 9] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/13/2022] [Revised: 05/02/2023] [Accepted: 05/15/2023] [Indexed: 05/22/2023]
Abstract
BACKGROUND Abundant evidence suggests that the prevalence and risk of depression in people with diabetes is high. However, the pathogenesis of diabetes-related depression remains unclear. Since neuroinflammation is associated with the pathophysiology of diabetic complications and depression, this study aims to elucidate the neuroimmune mechanism of diabetes-related depression. METHODS Male C57BL/6 mice were injected with streptozotocin to establish a diabetes model. After screening, diabetic mice were treated with the NLRP3 inhibitor MCC950. Then, metabolic indicators and depression-like behaviors were evaluated in these mice, as well as their central and peripheral inflammation. To explore the mechanism of high glucose-induced microglial NLRP3 inflammasome activation, we performed in vitro studies focusing on its canonical upstream signal I (TLR4/MyD88/NF-κB) and signal II (ROS/PKR/P2X7R/TXNIP). RESULTS Diabetic mice exhibited depression-like behaviors and activation of NLRP3 inflammasome in hippocampus. In vitro high-glucose (50 mM) environment primed microglial NLRP3 inflammasome by promoting NF-κB phosphorylation in a TLR4/MyD88-independent manner. Subsequently, high glucose activated the NLRP3 inflammasome via enhancing intracellular ROS accumulation, upregulating P2X7R, as well as promoting PKR phosphorylation and TXNIP expression, thereby facilitating the production and secretion of IL-1β. Inhibition of NLRP3 with MCC950 significantly restored hyperglycemia-induced depression-like behavior and reversed the increase in IL-1β levels in the hippocampus and serum. CONCLUSION The activation of NLRP3 inflammasome, probably mainly in hippocampal microglia, mediates the development of depression-like behaviors in STZ-induced diabetic mice. Targeting the microglial inflammasome is a feasible strategy for the treatment of diabetes-related depression.
Collapse
Affiliation(s)
- Wen-Jun Su
- Department of Stress Medicine, Faculty of Psychology, Naval Medical University, Shanghai 200433, China.
| | - Jia-Mei Li
- Department of Stress Medicine, Faculty of Psychology, Naval Medical University, Shanghai 200433, China; The 971st Hospital of PLA Navy, Qingdao 266072, China
| | - Ting Zhang
- Department of Stress Medicine, Faculty of Psychology, Naval Medical University, Shanghai 200433, China
| | - Zhi-Yong Cao
- Department of Stress Medicine, Faculty of Psychology, Naval Medical University, Shanghai 200433, China; Department of Psychiatry and Sleep Disorder, The 904th Hospital of PLA, Changzhou 213004, China
| | - Ting Hu
- Department of Stress Medicine, Faculty of Psychology, Naval Medical University, Shanghai 200433, China
| | - Shi-Yang Zhong
- Department of Stress Medicine, Faculty of Psychology, Naval Medical University, Shanghai 200433, China
| | - Zhang-Yang Xu
- Department of Stress Medicine, Faculty of Psychology, Naval Medical University, Shanghai 200433, China; The Battalion 3 of Cadet Brigade, School of Basic Medicine, Naval Medical University, Shanghai 200433, China
| | - Hong Gong
- Department of Developmental Neuropsychology, Faculty of Medical Psychology, Army Medical University (Third Military Medical University), Chongqing 400038, China
| | - Chun-Lei Jiang
- Department of Stress Medicine, Faculty of Psychology, Naval Medical University, Shanghai 200433, China.
| |
Collapse
|
3
|
Cannabidiol modulates contextual fear memory consolidation in animals with experimentally induced type-1 diabetes mellitus. Acta Neuropsychiatr 2023:1-11. [PMID: 36805056 DOI: 10.1017/neu.2023.13] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/22/2023]
Abstract
OBJECTIVES In view of the neuroprotective characteristic of cannabidiol (CBD) and its beneficial action on aversive memory in non-diabetic animals, we aimed to investigate in animals with experimentally induced type-1 diabetes mellitus (T1DM) whether CBD treatment would be able to impair the contextual fear memory consolidation, its generalisation and whether the effect would be lasting. We also investigated the CBD effect on anxiety-like responses. METHODS After T1DM induction, animals received single or more prolonged treatment with CBD and were submitted to the contextual fear conditioning test. As expression of activity-regulated cytoskeletal-associated (Arc) protein is necessary for memory consolidation, we evaluated its expression in the dorsal hippocampus (DH). For evaluating anxiety-related responses, animals were submitted to the elevated plus maze test (EPMT), in which the time and number of entries in the open arms were used as anxiety index. RESULTS A single injection of CBD impaired the contextual fear memory consolidation and its generalisation, which was evaluated by exposing the animal in a neutral context. This single injection was able to reduce the elevated expression of Arc in the DH from these animals. Interestingly, more prolonged treatment with CBD also impaired the persistence of context-conditioned fear memory and induced an anxiolytic-like effect, as the treated group spent more time in the open arms of the EPMT. CONCLUSION CBD interferes with contextual fear memory and the dosage regimen of treatment seems to be important. Moreover, we cannot rule out the involvement of emotional aspects in these processes related to fear memory.
Collapse
|
4
|
Blonde GD, Fletcher FH, Tang T, Newsome R, Spector AC. A new apparatus to analyze meal-related ingestive behaviors in rats fed a complex multi-food diet. Physiol Behav 2022; 252:113824. [PMID: 35472328 PMCID: PMC10544710 DOI: 10.1016/j.physbeh.2022.113824] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/22/2021] [Revised: 04/21/2022] [Accepted: 04/22/2022] [Indexed: 10/18/2022]
Abstract
The measurement of the size and timing of meals provides critical insight into the processes underlying food intake. While most work has been conducted with a single food or fluid, the availability of food choices can also influence eating and interact with these processes. The 5-Item Food Choice Monitor (FCM), a device that continuously measures eating and drinking behaviors of rats provided up to 5 foods and 2 fluids simultaneously, was designed to allow study of food choices simultaneously with meal patterns. To validate this device, adult male and female (n = 8 each) Sprague-Dawley rats were housed in the FCM. Food and fluid intake were measured continuously (22-h/day) while rats were presented water and powdered chow. Then a cafeteria diet of 5 foods varying in macronutrient content, texture, and flavors were offered along with water. Lastly, the 5 foods were offered along with 0.3 M sucrose and water. Analyses were conducted to find optimal criteria for parceling ingestive behavior into meals, and then meal patterns were quantified. Total intake, as assessed by FCM software, was in good concordance with that measured by an independent scale. A minimum meal size of 1 kcal and a meal termination criterion of 15-min accounted for >90% of total intake and produced meal dynamics that were in register with the literature. Use of the cafeteria diet allowed comparisons between meal patterns with a single food versus a multi-food diet, as well as analyses of macronutrient-related food choices across subsets of meals. The FCM proved to accurately measure food intake over a 22-h period and was able to detect differences and similarities in the meal patterns of rats as a function of sex and food choice availability. Combined with any number of experimental manipulations, the FCM holds great promise in the investigation of the physiological and neural controls of ingestive behavior in a dietary environment that allows food choices, more closely emulating human eating conditions.
Collapse
Affiliation(s)
- Ginger D Blonde
- Department of Psychology and Program in Neuroscience, Florida State University, 1107 W. Call St., Tallahassee, FL, 32306-4301 USA
| | - Fred H Fletcher
- Department of Psychology and Program in Neuroscience, Florida State University, 1107 W. Call St., Tallahassee, FL, 32306-4301 USA
| | - Te Tang
- Department of Psychology and Program in Neuroscience, Florida State University, 1107 W. Call St., Tallahassee, FL, 32306-4301 USA
| | - Ryan Newsome
- Department of Psychology and Program in Neuroscience, Florida State University, 1107 W. Call St., Tallahassee, FL, 32306-4301 USA
| | - Alan C Spector
- Department of Psychology and Program in Neuroscience, Florida State University, 1107 W. Call St., Tallahassee, FL, 32306-4301 USA.
| |
Collapse
|
5
|
Hitchen B, Norwood K, Gault VA, Leslie JC. Behavioural evaluation of mouse models of type 2 diabetes. LEARNING AND MOTIVATION 2021. [DOI: 10.1016/j.lmot.2021.101730] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
|
6
|
Valencia-Torres L, Bradshaw CM, Bouzas A, Hong E, Orduña V. Effect of streptozotocin-induced diabetes on performance on a progressive ratio schedule. Psychopharmacology (Berl) 2014; 231:2375-84. [PMID: 24402135 DOI: 10.1007/s00213-013-3401-5] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/08/2013] [Accepted: 12/02/2013] [Indexed: 12/29/2022]
Abstract
RATIONALE It has been suggested that streptozotocin (STZ)-induced diabetes causes a motivational deficit in rodents. However, some of the evidence adduced in support of this suggestion may be interpreted in terms of a motor impairment rather than a motivational deficit. OBJECTIVE This experiment examined the effect of STZ-induced diabetes on performance on a progressive ratio schedule. The data were analysed using a new model derived from Killeen's (Behav Brain Sci 17:105-172, 1994) Mathematical Principles of Reinforcement model which enables the effects of interventions on motivation or incentive value to be separated from effects on motor function. METHOD Animals were trained under a progressive ratio schedule using food-pellet reinforcement. Then they received a single intraperitoneal injection of 50 mg/kg of STZ or the vehicle. Training continued for 30 sessions after treatment. Running and overall response rates in successive ratios were analysed using the new model, and estimates of the model's parameters were compared between groups. RESULTS The parameter expressing incentive value was reduced in the group treated with STZ, whereas the parameters expressing motor capacity and post-reinforcement pausing were not affected by the treatment. Blood glucose concentration was significantly elevated in the STZ-treated group compared to the vehicle-treated group. CONCLUSIONS The results are consistent with the suggestion that STZ-induced diabetes is associated with a reduction of the incentive value of food.
Collapse
|
7
|
Yu JH, Shin MS, Lee JR, Choi JH, Koh EH, Lee WJ, Park JY, Kim MS. Decreased sucrose preference in patients with type 2 diabetes mellitus. Diabetes Res Clin Pract 2014; 104:214-9. [PMID: 24629412 DOI: 10.1016/j.diabres.2014.02.007] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/18/2013] [Revised: 01/06/2014] [Accepted: 02/11/2014] [Indexed: 10/25/2022]
Abstract
AIMS Increased sugar consumption may adversely affect glycemic control in patients with diabetes. Although patients with diabetes are generally thought to prefer sweet tastes, few data are available on the sucrose preference in these individuals. The aim of the present study was to evaluate sucrose preference in patients with type 2 diabetes in comparison with subjects without diabetes. METHODS Sucrose preference was assessed in 200 subjects (100 type 2 diabetes patients and 100 age-, sex- and body mass index (BMI)-matched control subjects). Sucrose preference was evaluated together with sucrose perception (i.e., sucrose sensitivity). Clinical and biochemical factors affecting sucrose taste were also analyzed. RESULTS Participants with type 2 diabetes preferred lower sucrose concentrations compared with control subjects (p=0.001), although they had a less sensitive palate for sucrose compared with subjects without diabetes (p=0.012). Individual sucrose preference demonstrated a negative relationship with sensitivity to sucrose in control subjects. Notably, this relationship between sucrose preference and sensitivity was completely absent in participants with type 2 diabetes. Male patients with diabetes demonstrated a higher sucrose preference compared with female patients. There were no significant correlations between sucrose preference and glycemic control, duration of diabetes, or anti-diabetic medications. CONCLUSIONS Participants with type 2 diabetes demonstrate a lower preference for sweet tastes than control subjects despite their decreased perception of sucrose. Reduced sucrose preference is not associated with better glycemic control in individuals with diabetes.
Collapse
Affiliation(s)
- Ji Hee Yu
- Division of Endocrinology and Metabolism, Department of Internal Medicine, Korea University College of Medicine, Seoul, Republic of Korea
| | - Mi-Seon Shin
- Division of Endocrinology and Metabolism, Department of Internal Medicine, University of Ulsan College of Medicine, Asan Medical Center, Seoul, Republic of Korea; Diabetes Center, Asan Medical Center, Seoul, Republic of Korea
| | - Jeong Rim Lee
- Diabetes Center, Asan Medical Center, Seoul, Republic of Korea; Outpatient Nursing Team, Asan Medical Center, Seoul, Republic of Korea
| | - Jong Han Choi
- Division of Endocrinology and Metabolism, Department of Internal Medicine, University of Ulsan College of Medicine, Asan Medical Center, Seoul, Republic of Korea; Diabetes Center, Asan Medical Center, Seoul, Republic of Korea
| | - Eun Hee Koh
- Division of Endocrinology and Metabolism, Department of Internal Medicine, University of Ulsan College of Medicine, Asan Medical Center, Seoul, Republic of Korea; Diabetes Center, Asan Medical Center, Seoul, Republic of Korea
| | - Woo Je Lee
- Division of Endocrinology and Metabolism, Department of Internal Medicine, University of Ulsan College of Medicine, Asan Medical Center, Seoul, Republic of Korea; Diabetes Center, Asan Medical Center, Seoul, Republic of Korea
| | - Joong-Yeol Park
- Division of Endocrinology and Metabolism, Department of Internal Medicine, University of Ulsan College of Medicine, Asan Medical Center, Seoul, Republic of Korea; Diabetes Center, Asan Medical Center, Seoul, Republic of Korea
| | - Min-Seon Kim
- Division of Endocrinology and Metabolism, Department of Internal Medicine, University of Ulsan College of Medicine, Asan Medical Center, Seoul, Republic of Korea; Diabetes Center, Asan Medical Center, Seoul, Republic of Korea.
| |
Collapse
|
8
|
Hajnal A, Acharya NK, Grigson PS, Covasa M, Twining RC. Obese OLETF rats exhibit increased operant performance for palatable sucrose solutions and differential sensitivity to D2 receptor antagonism. Am J Physiol Regul Integr Comp Physiol 2007; 293:R1846-54. [PMID: 17804583 DOI: 10.1152/ajpregu.00461.2007] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
CCK-1-receptor-deficient Otsuka Long-Evans Tokushima fatty (OLETF) rats are hyperphagic and exhibit a greater preference for sucrose compared with lean controls [Long-Evans Tokushima Otsuka (LETO)]. To directly assess motivation to work for sucrose reward in this model of obesity and type 2 diabetes, we examined the operant performance of OLETF rats at nondiabetic and prediabetic stages (14 and 24 wk of age, respectively) on fixed-ratio (FR) and progressive-ratio (PR) schedules of reinforcement. To evaluate the involvement of dopamine systems, the effects of the D1 receptor antagonist SCH23390 (100 and 200 nmol/kg ip) and the D2 receptor antagonist raclopride (200 and 400 nmol/kg ip), were also tested on PR responding for sucrose. Compared with age-matched LETO rats, 14-wk-old OLETF rats emitted more licks on the "active" empty spout operant on the FR-10 schedule of reinforcement to obtain 0.01 M and 0.3 M sucrose and completed higher ratio requirements on the PR schedule to gain access to 0.3 M and 1.0 M sucrose. At 24 wk, this effect was limited to 1.0 M sucrose. Both antagonists were potent in reducing operant responding to 0.3 M sucrose in both strains at both ages, and there was no strain effect to SCH23390 at either age. OLETF rats, on the other hand, showed an increased sensitivity to the higher dose of raclopride, resulting in reduced responding to sucrose reinforcement at 24 wk. Taken together, these findings provide the first direct evidence for an increased motivation for sucrose reward in the OLETF rats and suggest altered D2 receptor regulation with the progression of obesity and prediabetes.
Collapse
Affiliation(s)
- Andras Hajnal
- Dept. of Neural and Behavioral Sciences H181, College of Medicine, Pennsylvania State University, Hershey, PA 17033, USA.
| | | | | | | | | |
Collapse
|
9
|
Pai MH, Ko TL, Chou HC. Effects of streptozotocin-induced diabetes on taste buds in rat vallate papillae. Acta Histochem 2006; 109:200-7. [PMID: 17188340 DOI: 10.1016/j.acthis.2006.10.006] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/20/2006] [Revised: 10/23/2006] [Accepted: 10/25/2006] [Indexed: 11/20/2022]
Abstract
Some studies have documented taste changes in patients with diabetes mellitus (DM). In order to understand the relationships between taste disorders caused by DM and the innervation and morphologic changes in the taste buds, we studied the vallate papillae and their taste buds in rats with DM. DM was induced in these rats with streptozotocin (STZ), which causes the death of beta cells of the pancreas. The rats were sacrificed and the vallate papillae were dissected for morphometric and quantitative immunohistochemical analyses. The innervations of the vallate papillae and taste buds in diabetic and control rats were detected using immunohistochemistry employing antibodies directed against protein gene product 9.5 (PGP 9.5) and calcitonin gene-related peptide (CGRP). The results showed that PGP 9.5- and CGRP-immunoreactive nerve fibers in the trench wall of diabetic vallate papillae, as well as taste cells in the taste buds, gradually decreased both intragemmally and intergemmally. The morphometry revealed no significant difference in papilla size between the control and diabetic groups, but there were fewer taste buds per papilla (per animal). The quantification of innervation in taste buds of the diabetic rats supported the visual assessment of immunohistochemical labeling, that the innervation of taste cells was significantly reduced in diabetic animals. These findings suggest that taste impairment in diabetic subjects may be caused by neuropathy defects and/or morphological changes in the taste buds.
Collapse
Affiliation(s)
- Man-Hui Pai
- Department of Anatomy, School of Medicine, Taipei Medical University, 250 Wu-Hsing Street, Taipei 110, Taiwan. chou0217tmu.edu.tw
| | | | | |
Collapse
|
10
|
Ohara I, Tabuchi R, Onai K, Econ MH. Effects of modified rice bran on serum lipids and taste preference in streptozotocin-induced diabetic rats. Nutr Res 2000. [DOI: 10.1016/s0271-5317(99)00138-4] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
|
11
|
Sclafani A, Thompson B, Smith JC. The rat's acceptance and preference for sucrose, maltodextrin, and saccharin solutions and mixtures. Physiol Behav 1998; 63:499-503. [PMID: 9523890 DOI: 10.1016/s0031-9384(97)00478-2] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
Prior work indicates that rats prefer a mixture of sucrose and maltodextrin to either carbohydrate alone. The present experiment examined whether a sucrose + maltodextrin (S + M) mixture also increases total fluid intake as does saccharin + carbohydrate mixtures. In 23 h/day, one-bottle tests male rats consumed more of a 1% sucrose + 1% maltodextrin mixture than they did of either 2% sucrose or 2% maltodextrin. Adding 0.2% saccharin to the S + M mixture further stimulated consumption. The rats overconsumed the mixture solutions primarily by increasing bout size. In two-bottle choice tests the rats strongly preferred the S + M mixture to the 2% sucrose and 2% maltodextrin solutions and showed a nonreliable preference for the S + M + saccharin mixture to the S + M mixture. The palatability of the S + M mixture is thought to be related to the activation of separate "sweet" and "maltodextrin" tastes.
Collapse
Affiliation(s)
- A Sclafani
- Department of Psychology, Brooklyn College and The Graduate School, City University of New York, 11210, USA.
| | | | | |
Collapse
|
12
|
Abstract
Meal pattern measures (e.g., bout length and bout number) provide a detailed description of the elements of ingestion, and as a result they are theoretically more sensitive to experimental manipulation than simple measurements of total consumption over a fixed time period. For this reason, meal pattern measures are often used as a way to infer how rodents respond to tastants or how pharmacological or surgical treatments modify ingestive behavior. This approach relies on the assumption that under normal conditions, the meal patterns of individual rats are consistent across consecutive light-dark (L-D) cycles. If these patterns are inconsistent, then experimental designs involving meal patterns would have limited power, and thus require relatively large sample sizes. The present study critically evaluates the consistency assumption in Sprague-Dawley and Fisher-344 rats by monitoring meal patterns over 10 consecutive L-D cycles. For each rat, the following feeding and drinking measures were determined: total daily intake, duration of night bouts, number of night bouts, and number of licks per night bout. The analysis excluded daytime ingestive measures owing to their infrequent occurrence. Ingestive measures were highly consistent across time in all Sprague-Dawleys, but in only a minority of the Fisher-344s. The distribution of feeding and drinking activity throughout each night was also determined in the same rats. Whereas Sprague-Dawleys displayed lights-off and lights-on peaks of ingestive activity, only a minority of Fisher-344s displayed a consistent lights-on peak of ingestive activity. It is concluded that rat strains can differ with respect to the consistency of meal patterning, and that such strain differences should be considered in future comparative studies of meal patterns in rats.
Collapse
Affiliation(s)
- J I Glendinning
- Department of Biological Science, Florida State University, Tallahassee 32306
| | | |
Collapse
|
13
|
Abstract
Taste preferences for saccharin in concentrations ranging from 0.16 mM to 50 mM were determined in rats made hypothyroid with radioactive iodine and in their littermate controls. Hypothyroid rats demonstrated taste preferences for saccharin which were similar to those of controls only at very low (0.016 mM) or very high (49.0 mM) saccharin concentrations. At these concentrations of tastant, the preferences for tastant and water were similar to one another. At a concentration of 5.1 mM, preferences were also very similar in both groups but were very high. At intermediate saccharin concentrations of 1.1 and 3.0 mM, hypothyroid animals showed significantly lower percent preferences for the sweet tastant than did controls, mean +/- SEM (62.48 +/- 5.97 vs. 82.92 +/- 4.60, p = 0.0002) for the 1.1 mM concentration and (74.98 +/- 5.12 vs. 89.40 +/- 2.54, p = 0.0029) for the 3.0 mM concentration. These changes in taste preference for saccharin in hypothyroid rats were similar in direction and magnitude to those previously published by this laboratory using sucrose as the tastant. Thus, hypothyroid rats demonstrate abnormalities in taste preference for both the nonnutritive sweetener, sodium saccharin, as well as for the nutritive sweetener, sucrose.
Collapse
|
14
|
Gannon KS, Smith JC, Henderson R, Hendrick P. A system for studying the microstructure of ingestive behavior in mice. Physiol Behav 1992; 51:515-21. [PMID: 1523228 DOI: 10.1016/0031-9384(92)90173-y] [Citation(s) in RCA: 42] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
A system for long-term monitoring of mouse eating and drinking behavior with 6-s resolution is described. The apparatus utilizes infrared beams to monitor activity at a single feeding port and electronic contact detector circuitry to record individual licks at two drinking ports. Eight SWR/J mice were monitored using this system and data from the last day of testing with food and water were analyzed. Mice ate an average of 4.54 +/- 0.40 g of powdered food and drank an average of 5.81 +/- 0.65 ml of water. Mice had an average of 36.25 +/- 3.96 food bouts and 32.25 +/- 7.56 water bouts lasting 3.00 +/- 0.48 and 0.88 +/- 0.35 min, respectively. Information regarding the temporal association between eating and drinking and the circadian patterns of ingestion was provided, utilizing customized software that augments the system. Important implications for the use of mice in ingestion pattern research are discussed.
Collapse
Affiliation(s)
- K S Gannon
- Psychology Department, Florida State University, Tallahassee 32306-1051
| | | | | | | |
Collapse
|
15
|
Stricker EM, Gannon KS, Smith JC. Thirst and salt appetite induced by hypovolemia in rats: analysis of drinking behavior. Physiol Behav 1992; 51:27-37. [PMID: 1741449 DOI: 10.1016/0031-9384(92)90200-l] [Citation(s) in RCA: 46] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
A detailed description of the increased intake of water and 0.5 M NaCl solution by rats after colloid-induced hypovolemia was obtained by measuring drinking activity every 6 s for 23 h. After an initial phase of largely single-bout water drinking that reflected hypovolemic thirst, there was a marked increase in saline drinking in multiple-bout episodes. This salt appetite developed while rats were volume depleted but persisted for hours even after the plasma volume deficits were repaired. Their drinking episodes then seemed to reflect osmoregulation, since cumulative intakes of water and saline were in appropriate proportions to produce a near-isotonic NaCl solution. Remarkably, rats concocted a 1% NaCl solution within 29% of the drinking episodes, by alternating intakes of water and saline every 30-90 s. This alternation was too rapid to allow significant absorption of ingested fluids from the intestines and changes in plasma osmolality, and thereby to permit central osmoreceptors to influence ongoing consumption. Instead, we propose that, in these episodes, rats are guided by gustatory receptors to obtain the desired NaCl in a palatable solution.
Collapse
Affiliation(s)
- E M Stricker
- Department of Behavioral Neuroscience, University of Pittsburgh, PA 15260
| | | | | |
Collapse
|