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Obesity Studies

Glucose Ingestion Fails to Inhibit Hypothalamic Neuronal Activity in Patients With Type 2 Diabetes

  1. Solrun Vidarsdottir1,
  2. Paul A.M. Smeets2,
  3. Diane L. Eichelsheim1,
  4. Matthias J.P. van Osch3,
  5. Max A. Viergever2,
  6. Johannes A. Romijn1,
  7. Jeroen van der Grond3 and
  8. Hanno Pijl1
  1. 1Department of Endocrinology and Metabolism, Leiden University Medical Center, Leiden, The Netherlands
  2. 2Image Sciences Institute, University Medical Center Utrecht, Utrecht, the Netherlands
  3. 3Department of Radiology, Leiden University Medical Center, Leiden, the Netherlands
  1. Address correspondence and reprint requests to Hanno Pijl, MD, PhD, Leiden University Medical Center, Department of Endocrinology and Metabolic Disease, C4-83, P.O. Box 9600, 2300 RC, Leiden, Netherlands. E-mail: h.pijl{at}lumc.nl
Diabetes 2007 Oct; 56(10): 2547-2550. https://doi.org/10.2337/db07-0193
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Abstract

OBJECTIVE—The hypothalamus plays a critical role in the regulation of energy balance and fuel flux. Glucose ingestion inhibits hypothalamic neuronal activity in healthy humans. We hypothesized that hypothalamic neuronal activity in response to an oral glucose load would be altered in patients with type 2 diabetes.

RESEARCH DESIGN AND METHODS—In this randomized, single blind, case-control study, 7 type 2 diabetic men (BMI 27.9 ± 2.0 kg/m2) and 10 age-matched healthy men (BMI 26.1 ± 3.2 kg/m2) were scanned twice for 38 min on separate days using functional magnetic resonance imaging. After 8 min, they ingested either a glucose solution (75 g in 300 ml water) or water (300 ml).

RESULTS—Glucose ingestion resulted in a prolonged significant blood oxygen level–dependent signal decrease in the upper and lower hypothalamus in healthy subjects but not in diabetic patients.

CONCLUSIONS—Glucose ingestion fails to inhibit hypothalamic neuronal activity in patients with type 2 diabetes. Failure of neural circuits to properly adapt to nutrient ingestion may contribute to metabolic imbalance in type 2 diabetic patients.

  • BOLD, blood oxygen level dependent
  • fMRI, functional magnetic resonance imaging
  • GLP-1, glucagon-like peptide 1

The brain plays a central role in the regulation of food intake and energy balance (1). Hypothalamic and brain stem nuclei perceive and integrate circulating metabolic (e.g., glucose and lipids) and hormonal (e.g., leptin, insulin, and various gut peptides) cues reflecting available fuel sources. Indeed, an oral glucose load acutely mitigates hypothalamic neuronal activity in healthy humans (2). Efferent neuroendocrine ensembles subsequently orchestrate food intake and fuel metabolism so as to maintain energy homeostasis (1,3). Energy imbalance and anomalous fuel flux are metabolic hallmarks of obesity and type 2 diabetes. In view of the critical role of the brain in the control of metabolism described above, inappropriate hypothalamic processing of signals indicating disruption of energy homeostasis could contribute to such metabolic anomalies. We hypothesized that hypothalamic neuronal activity in response to glucose ingestion would be altered in patients with type 2 diabetes, reflecting aberrant perception of current metabolic status.

The blood oxygen level–dependent (BOLD) signal, recorded by functional magnetic resonance imaging (fMRI), was used as an proximate measure of neuronal activity (4). This technique detects changes in blood oxygen levels determined by local changes in oxygen consumption, blood flow, and blood volume driven by neuronal firing (5).

RESEARCH DESIGN AND METHODS

We studied 7 type 2 diabetic men who were treated with either oral glucose-lowering medication or diet alone and 10 healthy men without family history of type 2 diabetes. The characteristics of the subjects are given in Table 1. Subjects were excluded if they had poorly controlled hypertension (>160/100 mmHg), chronic renal failure or leg ulcers, or any chronic disease and if they smoked or had a history of alcohol or drug abuse.

Glucose solution (75 g in 300 ml water) or 300 ml tap water were ingested after a 10-h overnight fast in random order on 2 separate days with an interval of at least 1 week. Beginning 8 min before drinking, the hypothalamic BOLD signal was recorded for 30 min by fMRI on a 3.0 Tesla scanner (Philips Achieva; Philips Medical Systems, Best, The Netherlands). A T2-weighted echo-planar imaging sequence (repetition time 120 ms, echo time 30 ms, flip angle 30°, image matrix 256 × 231, field of view 208 × 208 mm, 12 signal averages per scan) was used to scan a 12-mm–thick midsagittal slice. A T1-weighted anatomical scan was made of the same slice (repetition time = 550 ms, echo time 10 ms, field of view 208 × 208 mm). The images were preprocessed and analyzed as described previously (2), except for the use of a thalamic reference area (10 × 10 pixels, Fig. 1A) instead of a reference area in the frontal cortex (which had poor image quality). For every subject, the hypothalamus was manually segmented and divided into four regions (Fig. 1A), i.e., the upper anterior hypothalamus, upper posterior hypothalamus, lower anterior hypothalamus, and lower posterior hypothalamus, by two orthogonal axes according to predefined criteria (6). This was done to make the data comparable with those reported in previous publications. Figure 1B sketches relevant nuclei contained within each hypothalamic area by approximation.

SPSS 12.0 (SPSS, Chicago, IL) was used for data management and statistical analysis. The baseline BOLD signal was defined as the average of signals recorded during 8 min before ingestion of test solutions. Signal changes in response to intervention were calculated per minute as a percentage of baseline values. Results are presented as means ± SEM. Differences within groups were assessed by differential regression analysis (7). A Bonferroni-corrected threshold of significance (P = 0.0013) was applied, since 38 t tests were performed per comparison.

RESULTS

On average, it took 5.5 ± 2.4 min (both groups pooled) to ingest the glucose solution or the water. Figure 2 shows BOLD signal changes in the four hypothalamic regions defined by our zoning strategy. After a considerable drop occurring during ingestion of the test solutions in both groups, the signal returned to baseline. The signal drop is an artifact caused by swallowing and slight movements of the head during drinking. Thereafter, the BOLD signal steadily, consistently, and significantly decreased in response to glucose ingestion in all regions in the control group. In contrast, glucose ingestion did not impact the BOLD signal in type 2 diabetic patients in any hypothalamic area (Fig. 2). Notably, the BOLD signal increased significantly in the lower anterior hypothalamus and lower posterior hypothalamus after water ingestion in type 2 diabetic patients but not in control subjects.

The diminution of hypothalamic BOLD signals in response to an oral glucose load that we observed in control subjects corroborates earlier reports of similar studies in healthy humans (2,8). The identity of the neurons, whose activity is suppressed by glucose ingestion, remains to be established. Hypothalamic nuclei harbor a host of distinct neuronal cell types that are involved in the control of postprandial satiety and fuel flux. These neurons respond to various circulating nutrients and hormones to guide homeostatic adjustments of food consumption and metabolism (1). For example, inhibition of neuropeptide Y neurons in the arcuate nucleus (located in the lower posterior hypothalamic region as defined in the current study) by meal-related hormones such as glucagon-like peptide 1 (GLP-1) and peptide YY induces satiety (9,10). Moreover, this component of the gut-brain axis may reinforce insulin action after meals to effectively inhibit endogenous glucose production and promote storage of ingested nutrients (11,12). The mechanism driving these adaptations involves other hypothalamic areas, including the paraventricular nucleus and lateral hypothalamus (Fig. 1B) (1).

The fact that the BOLD signal did not decline in response to ingestion of glucose in the type 2 diabetic patients suggests that the hypothalamus of the diabetic patients inappropriately perceives and/or processes signals reflecting encroachment of fuel homeostasis in response to a nutrient load. In view of the critical role of the hypothalamus in the regulation of food intake and fuel flux described above, such a maladaptive response may have important ramifications. Thus, erroneous hypothalamic processing of metabolic and/or endocrine signals mirroring energy availability may compromise postprandial satiety in type 2 diabetic patients. Also, hypothalamic dysfunction may hamper postprandial insulin action and thereby contribute to inadequate suppression of glucose production and diminution of nutrient disposal after meals, metabolic anomalies that mark type 2 diabetes. Finally, postprandial thermogenesis and energy expenditure may be abnormal in diabetic humans, as the hypothalamus is critically involved in the regulation of energy metabolism (13).

Conversely, the metabolic anomalies that typify type 2 diabetes may have led to the aberrant hypothalamic response reported here. The mechanistic link between oral glucose ingestion and hypothalamic neuronal activity remains to be established. Various circulating metabolic and endocrine cues that change in response to glucose intake, including glucose, fatty acids, insulin, and a number of gut peptides, may be involved (13). Since type 2 diabetes is marked by abnormal postprandial plasma concentrations of virtually all of these cues, it is conceivable that the metabolic state of our patients has contributed to the failure of hypothalamic neurons to properly respond to an oral glucose load. Although both circulating glucose and insulin can modulate neuronal firing in the hypothalamus (14,15), we have some evidence that neither of these cues alone contributes significantly to the hypothalamic response observed here. Indeed, maltodextrin intake does not impact hypothalamic activity determined by fMRI, despite ensuing plasma glucose and insulin profiles similar to those in response to glucose ingestion (16). As GLP-1 secretion in response to meals is diminished in type 2 diabetes (17), and GLP-1 inhibits hypothalamic neuronal activity (18), this peptide may be one of the aberrant cues involved. However, whatever the cause of the phenomenon we have observed, given the important role of the hypothalamus in the control of metabolism, improper relay of signals by (circulating) cues supposedly compromises postprandial metabolic flux.

At least two alternative explanations for the lack of BOLD signal response to glucose ingestion in type 2 diabetes patients should be considered here. First, neurovascular coupling, i.e., the mechanism by which changes in neuronal activity regulate local cerebral blood perfusion (19), could be compromised in patients with type 2 diabetes. There are no data on the influence of diabetes on neurovascular coupling to date. Importantly, normal aging, often associated with insulin resistance, did not affect neurovascular coupling in a recent study (20). Second, microvascular disease, which often accompanies diabetes, may hamper hemodynamic adaptations to neural activity. However, the patients participating in our study had diabetes for only 4.7 ± 2.8 years, were in good glycemic control, and had virtually no signs of microvascular complications, as only one of seven patients had microalbuminuria, and none had retinopathy.

DISCUSSION

We report that the BOLD signal in the hypothalamus does not properly subside in response to an oral glucose load in moderately obese patients with type 2 diabetes, indicating that glucose ingestion fails to inhibit hypothalamic neuronal activity in these patients. This suggests that hypothalamic neurons of type 2 diabetic patients erroneously perceive and/or process endocrine cues reflecting nutrient availability. Since the hypothalamus coordinates metabolic and behavioral adaptations in response to these cues to maintain energy balance, hypothalamic dysfunction may hamper postprandial insulin action and compromise satiety in patients with type 2 diabetes.

FIG. 1.
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FIG. 1.

A: Segmentation and subdivision of the hypothalamus into four regions of interest (6). B): Individual nuclei that are contained in each subdivision of the hypothalamus (defined in A) by approximation. We emphasize that individual nuclei cannot be imaged by magnetic resonance imaging at this stage of technological development. Changes in the fMRI signal arise from changes in blood oxygenation, driven by neuronal firing. Therefore, the localization of an fMRI response is not as accurate as that of single-cell or multi-unit electrical recordings. Given the above, one cannot identify specific hypothalamic nuclei as the source of an fMRI signal. ac, anterior commissure; ARC, arcuate nucleus; DMN, dorsomedial nucleus; LAH, lower anterior hypothalamus; LHA, lateral hypothalamic area; LPH, lower posterior hypothalamus; mm, mammillary body; oc, optic chiasm; PVN, paraventricular nucleus; Th, thalamic reference area; UAH, upper anterior hypothalamus; UPH, upper posterior hypothalamus; VMH, ventromedial hypothalamus.

FIG. 2.
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FIG. 2.

Mean BOLD signal changes in response to ingestion of water or glucose in four subregions of the hypothalamus. □, water; ▪, glucose solution (75 g glucose). *P < 0.0013. Error bars are SEs of the mean. DM2, type 2 diabetes.

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TABLE 1

Participant characteristics

Acknowledgments

This study was supported by the Dutch Diabetes Foundation (grant 2002.01.005).

Footnotes

  • Published ahead of print at http://diabetes.diabetesjournals.org on 1 August 2007. DOI: 10.2337/db07-0193.

    The costs of publication of this article were defrayed in part by the payment of page charges. This article must therefore be hereby marked “advertisement” in accordance with 18 U.S.C. Section 1734 solely to indicate this fact.

    • Accepted July 1, 2007.
    • Received February 20, 2007.
  • DIABETES

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Glucose Ingestion Fails to Inhibit Hypothalamic Neuronal Activity in Patients With Type 2 Diabetes
Solrun Vidarsdottir, Paul A.M. Smeets, Diane L. Eichelsheim, Matthias J.P. van Osch, Max A. Viergever, Johannes A. Romijn, Jeroen van der Grond, Hanno Pijl
Diabetes Oct 2007, 56 (10) 2547-2550; DOI: 10.2337/db07-0193

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Glucose Ingestion Fails to Inhibit Hypothalamic Neuronal Activity in Patients With Type 2 Diabetes
Solrun Vidarsdottir, Paul A.M. Smeets, Diane L. Eichelsheim, Matthias J.P. van Osch, Max A. Viergever, Johannes A. Romijn, Jeroen van der Grond, Hanno Pijl
Diabetes Oct 2007, 56 (10) 2547-2550; DOI: 10.2337/db07-0193
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