Next Article in Journal
Functional Characterization of Waterlogging and Heat Stresses Tolerance Gene Pyruvate decarboxylase 2 from Actinidia deliciosa
Next Article in Special Issue
Ketamine, a Clinically Used Anesthetic, Inhibits Vascular Smooth Muscle Cell Proliferation via PP2A-Activated PI3K/Akt/ERK Inhibition
Previous Article in Journal
Lactobacillus bulgaricus, Lactobacillus rhamnosus and Lactobacillus paracasei Attenuate Salmonella Enteritidis, Salmonella Heidelberg and Salmonella Typhimurium Colonization and Virulence Gene Expression In Vitro
Previous Article in Special Issue
Beneficial Effects of Galectin-3 Blockade in Vascular and Aortic Valve Alterations in an Experimental Pressure Overload Model
Open AccessArticle

Alteration of Vascular Responsiveness to Uridine Adenosine Tetraphosphate in Aortas Isolated from Male Diabetic Otsuka Long-Evans Tokushima Fatty Rats: The Involvement of Prostanoids

Department of Physiology and Morphology, Institute of Medicinal Chemistry, Hoshi University, Shinagawa-ku, Tokyo 142-8501, Japan
*
Authors to whom correspondence should be addressed.
Int. J. Mol. Sci. 2017, 18(11), 2378; https://doi.org/10.3390/ijms18112378
Received: 27 October 2017 / Revised: 8 November 2017 / Accepted: 8 November 2017 / Published: 9 November 2017
We investigated whether responsiveness to dinucleotide uridine adenosine tetraphosphate (Up4A) was altered in aortas from type 2 diabetic Otsuka Long-Evans Tokushima Fatty (OLETF) rats compared with those from age-matched control Long-Evans Tokushima Otsuka (LETO) rats at the chronic stage of disease. In OLETF aortas, we observed the following: (1) Up4A-induced contractions were lower than those in the LETO aortas under basal conditions, (2) slight relaxation occurred due to Up4A, but this was not observed in phenylephrine-precontracted LETO aortas, (3) acetylcholine-induced relaxation was reduced (vs. LETO), and (4) prostanoid release (prostaglandin (PG)F, thromboxane (Tx)A2 metabolite, and PGE2) due to Up4A was decreased (vs. LETO). Endothelial denudation suppressed Up4A-induced contractions in the LETO group, but increased the contractions in the OLETF group. Under nitric oxide synthase (NOS) inhibition, Up4A induced contractions in phenylephrine-precontracted aortas; this effect was greater in the LETO group (vs. the OLETF group). The relaxation response induced by Up4A was unmasked by cyclooxygenase inhibitors, especially in the LETO group, but this effect was abolished by NOS inhibition. These results suggest that the relaxant component of the Up4A-mediated response was masked by prostanoids in the LETO aortas and that the LETO and OLETF rats presented different contributions of the endothelium to the response. View Full-Text
Keywords: aorta; contraction; prostanoid; relaxation; type 2 diabetes; Up4A aorta; contraction; prostanoid; relaxation; type 2 diabetes; Up4A
Show Figures

Figure 1

MDPI and ACS Style

Matsumoto, T.; Kobayashi, S.; Ando, M.; Iguchi, M.; Takayanagi, K.; Kojima, M.; Taguchi, K.; Kobayashi, T. Alteration of Vascular Responsiveness to Uridine Adenosine Tetraphosphate in Aortas Isolated from Male Diabetic Otsuka Long-Evans Tokushima Fatty Rats: The Involvement of Prostanoids. Int. J. Mol. Sci. 2017, 18, 2378.

Show more citation formats Show less citations formats
Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.

Article Access Map

1
Back to TopTop