Abstract
The higher permeability of the venules in jejunal microcirculation to albumin contributes to the increased mesenteric lymph formation. Recently, we demonstrated that water intake induced serotonin release from enterochromaffin cells in rat jejunum, serotonin of which circulated through the portal vein into blood circulation and then increased the mesenteric lymph formation. The mode of action of serotonin remains unclear. Therefore, we aimed to clarify the mechanisms involved in the regulation of the jejunal lymph formation with permeant albumin in in vivo rat experiments. We investigated the effects of intravenous administration of serotonin or water intake on the jejunal-originated lymph volume and the concentration of albumin in the lymph in the presence or absence of L-NAME. The effects of intravenous administration of L-NAME, nicardipine, A23187, and ML-7 on the lymph formation with permeant albumin were also evaluated. Serotonin or water intake significantly increased the mesenteric lymph volume with permeant albumin in the jejunal microcirculation. The serotonin- and water intake–mediated responses were significantly reduced by the pretreatment with intravenous administration of L-NAME. Intravenous administration of L-NAME itself also decreased significantly the jejunal lymph formation. Administration of A23187 and ML-7 significantly reduced the jejunal lymph formation with permeant albumin. In contrast, administration of nicardipine significantly increased the lymph formation. In conclusion, portal venous blood flow– or serotonin-mediated NO release from venular endothelial cells plays physiologically key roles in the lymph formation in rat jejunum via the extrusion of calcium ions and inactivation of MLCK in endothelial cells.
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All relevant data are available from the corresponding author on request.
Abbreviations
- PSS:
-
Physiological saline solution
- PBS:
-
Phosphate-buffered saline
- NO:
-
Nitric oxide
- L-NAME:
-
NG-Nitro-L-arginine methyl ester hydrochloride
- ML-7:
-
1-(5-Iodonaphthalene-1-sulfonyl)-1H-hexahydro-1,4-diazepinehydrochloride
- ELISA:
-
Enzyme-linked immunosorbent assay
- MLCK:
-
Myosin light chain kinase
- SEM:
-
Standard errors of the mean
- NS:
-
Not significant
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Acknowledgements
We thank Editage for English language editing in support of non-native English speakers. The Department of Innovation of Medical and Health Sciences Research at Shinshu University School of Medicine has been established and supported financially by the donation of BOURBON, Co., Ltd, Kashiwazaki, Niigata, Japan, and Aizawa Hospital, Matsumoto, Nagano, Japan.
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The authors declare that this study received funding from BOURBON Co. Ltd. The funder was not involved in the study design, collection, analysis, interpretation of data, the writing of this article, or the decision to submit it for publication.
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T.O. wrote the manuscript, designed the experiments, and analyzed the data. Y.K., M.H., and T-W-A. designed the experiments, analyzed the data, and revised the manuscript. K.A., R.K., N.A., K.A., D.M., Y.Y., and M.K. performed the experiments, and analyzed data. All authors approved the final version of the manuscript and accepted for the publication of this manuscript.
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Amari, K., Kajihara, R., Arai, N. et al. Portal blood flow–dependent NO-mediated lymph formation in rat jejunum. Pflugers Arch - Eur J Physiol 474, 541–551 (2022). https://doi.org/10.1007/s00424-022-02670-2
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DOI: https://doi.org/10.1007/s00424-022-02670-2