The Korean Journal of Physiology and Pharmacology

The Korean Society of Pharmacology (대한약리학회)
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Characteristics of Diprophylline-Induced Bidirectional Modulation on Rat Jejunal Contractility

  • Liu, Fang-Fei (Department of Pharmacology, Dalian Medical University) ;
  • Chen, Da-Peng (Department of Pharmacology, Dalian Medical University) ;
  • Xiong, Yong-Jian (Department of Pharmacology, Dalian Medical University) ;
  • Lv, Bo-Chao (Department of Pharmacology, Dalian Medical University) ;
  • Lin, Yuan (Department of Pharmacology, Dalian Medical University)
  • Received : 2013.10.29
  • Accepted : 2013.12.17
  • Published : 2014.02.28
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Abstract

In this study, we propose that diprophylline exerts bidirectional modulation (BM) on the isolated rat jejunal segment depending on its contractile state. The results supported the hypothesis. Diprophylline ($20{\mu}M$) exerted stimulatory effects on the contractility of jejunal segment in six low contractile states while inhibitory effects in six high contractile states, showing the characteristics of BM. Diprophylline-induced stimulatory effect was significantly blocked by atropine, indicating the correlation with cholinergic activation. Diprophylline-induced inhibitory effect was partially blocked by phentolamine, propranolol, and L-N-Nitro-Arginine respectively, indicating their correlation with sympathetic activation and nitric oxide-mediated relaxing mechanisms. Diprophylline-induced BM was abolished by tetrodotoxin or in a $Ca^{2+}$ free condition or pretreated with tyrosine kinase inhibitor imatinib, suggesting that diprophylline-induced BM is $Ca^{2+}$ dependent, and that it requires the presence of enteric nervous system as well as pacemaker activity of interstitial cells of Cajal. Diprophylline significantly increased the reduced MLCK expression and myosin extent in constipation-prominent rats and significantly decreased the increased MLCK expression and myosin extent in diarrhea-prominent rats, suggesting that the change of MLCK expression may also be involved in diprophylline-induced BM on rat jejunal contractility. In summary, diprophylline-exerted BM depends on the contractile states of the jejunal segments, requires the presence of $Ca^{2+}$, enteric nervous system, pacemaker activity of interstitial cells of Cajal, and MLCK-correlated myosin phosphorylation. The results suggest the potential implication of diprophylline in relieving alternative hypo/hyper intestinal motility.

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References

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