Abstract
Background
Patients with chemotherapy-induced gastrointestinal mucositis often suffer from weight loss. It is not well known how to enterally feed mucositis patients, potentially experiencing malabsorption. Recently, we showed in a rat model of methotrexate (MTX)-induced mucositis that intestinal absorption of glucose in trace amounts is still intact. We now determined the quantitative capacity to absorb glucose in rats with mucositis, relative to controls.
Methods
We administered a physiologically relevant amount of [1-13C]glucose-enriched glucose (meal size) as a bolus by oral gavage (2 g/kg once) or continuously by intraduodenal infusion (±1.9 g/(kg·h) for 5 h) to rats with MTX-induced mucositis and controls. Blood [1-13C]glucose concentrations were determined during the experimental period. To calculate the quantitative absorptive capacity, Steele’s one-compartment model, including simultaneous intravenous infusion of [6,6-2H2]glucose, was used. After the experiment, jejunal histology and plasma citrulline concentrations were assessed.
Results
MTX-induced mucositis was confirmed by a reduction in villus length and plasma citrulline (both −57 %, relative to controls, P < 0.01). When glucose was administered as a bolus, MTX-treated rats only absorbed 15 % of administered glucose, compared with 85 % in controls (medians, P < 0.01). Upon continuous intraduodenal glucose infusion, the median absorptive capacity for glucose in MTX-treated rats did not differ from controls (80 versus 93 % of administered glucose respectively, P = 0.06). However, glucose absorption differed substantially between individual MTX-treated rats (range, 21–95 %), which correlated poorly with villus length (rho = 0.54, P = 0.030) and plasma citrulline (rho = 0.56, P = 0.024).
Conclusion
Continuous enteral administration can almost completely overcome the reduced absorptive capacity for glucose in rats with mucositis.
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Acknowledgments
The authors wish to thank Rick Havinga, Juul Baller, Theo Boer, Angelika Jurdzinski, and Pieter Klok for the excellent technical assistance in our studies.
Grants
This study was financially supported by an unrestricted research grant from Fonds NutsOhra.
Conflict of interest
We have nothing to declare. All authors have full control of all primary data and agree to allow the journal to review the data if requested.
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Relevance of our manuscript to inform research, policies, and/or programs
In our manuscript, we show that continuous enteral administration can almost completely overcome the reduced absorptive capacity for glucose in rats with chemotherapy-induced gastrointestinal mucositis. Glucose might therefore be an appropriate source of dietary energy for a substantial portion of patients with mucositis, when enterally administered continuously. Our work is relevant for everybody who is involved in the feeding strategy of patients with mucositis (doctors, dieticians, caretakers, food industries, etc.).
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Fijlstra, M., Rings, E.H.H.M., van Dijk, T.H. et al. Continuous enteral administration can overcome the limited capacity to absorb glucose in rats with methotrexate-induced gastrointestinal mucositis. Support Care Cancer 21, 863–871 (2013). https://doi.org/10.1007/s00520-012-1597-2
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DOI: https://doi.org/10.1007/s00520-012-1597-2