VOL. 36 S-3 CHEMOTHERAPY 437

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VOL. 36 S-3 CHEMOTHERAPY 437

438 CHEMOTHERAPY JULY 1988 Fig. 1 Contractile response of gastrointestinal tract to intravenous administration of saline and EM in interdigestive state in dogs (a) : Saline, 15m1

VOL. 36 S-3 CHEMOTHERAPY 439 Fig. 1 Contractile response of gastrointestinal tract to intravenous administration of saline and EM in interdieestive state in does (b): EM, 0.1 mg/kg (c): EM, 0.3 mg/kg

440 CHEMOTHERAPY JULY 1988 Fig. 1 Contractile response of gastrointestinal tract to intravenous administration of saline and EM in (d) : EM, 1.0 mg/kg interdigestive state in dogs (e) : EM, 3.0 mg/kg

VOL. 36 S-3 CHEMOTHERAPY 441 Fig. 2 Contractile response of gastrointestinal tract to intravenous administration of TE-031 in interdigestive state in dogs (a): TE-031, 0.1mg/kg (b): TE-031, 0.3mg/kg

442 CHEMOTHERAPY JULY 1988 Fig. 2 Contractile response of gastrointestinal tract to intravenous administration of TE-031 in (c) : TE-031, 1.0 mg/kg interdigestive state in dogs

VOL. 36 S-3 CHEMOTHERAPY 443 Fig. 3 Contractile response of gastrointestinal tract to intraduodenal instillation of EM in (a): EM, 0.3 mg/kg interdigestive state in dogs (b): EM, 1.0 mg/kg

444 CHEMOTHERAPY JULY 1988 Fig. 3 Contractile response of gastrointestinal tract to intraduodenal instillation of EM in (c) : EM, 3.0 mg/kg interdigestive state in dogs Table 1 Comparison of gastric contractile activity after administration of EM or TE-031 in interdigestive state n=5 Mean }S.D, Potency of contraction compared with naturally occurring IMC (100)

Fig. 4 Contractile activity of gastrointestinal tract in response to intraduodenal instillation of TE-031 in interdigestive state in dogs

Fig. 4 Contractile activity of gastrointestinal tract in response to intraduodenal instillation of TE-031 in interdigestive state in dogs Fig. 5 Gastrointestinal contractile activity in response to intravenous administration of EM in digestive state in dogs

Fig. 5 Gastrointestinal contractile activity in response to intravenous administration of EM in digestive state in dogs

Fig. 6 Gastrointestinal contractile activity in response to intravenous administration of TE-031 in digestive state in dogs

Fig. 7 Contractile response of the gastrointestinal tract to EM in digestive state in dogs Fig. 8 Changes in plasma concentration of TE-031 and EM after intraduodenal instillation of 3.0mg/kg of TE-031 or EM in interdigestive state in dogs

Fig. 9 Changes in plasma concentration of EM and immunoreactive motilin concentration in response to intraduodenal instillation of 1.0 and 3.0 mg/kg of EM in interdigestive state in dogs 1) ITOH, Z., SUZUKI, T., NAKAYA, M., INOUE, M. and MITSUHASHI, S.: Gastrointestinal motor-stimulating activity of macrolide antibiotics and analysis of their side effects of the canine gut. Antimicrob. Agents. Chemother. 26: 863--869, 1984 2) ITOH, Z., HONDA, R., TAKEUCHI, S., AIZAWA, I. and TAKAYANAGI, R.: An extraluminal force transducer for recording contractile activity of the gastrointestinal smooth muscle in conscious dogs: Its construction and implantation. Gastroent. Jpn. 12: 275-283, 1977 3) ITOH, Z., AIZAWA, I., TAKEUCHI, S. and TAKAYANAGI, R.: Diurnal changes in gastric motor activity in conscious dogs. Am. J. Dig. Dis. 22: 117 `124, 1977 4) ITOH, Z., TAKEUCHI, S., AIZAWA, I., MORI, K., TAMI- NATO, T., SEINO, Y., IMURA, H. and YANAIHARA, N.: Changes in plasma motilin concentration and gastrointestinal contractile activity in conscious dogs. Am. J. Dig. Dis. 23: 929-935, 1978

5) ITOH, Z., SUZUKI, T., NAKAYA, M., INOUE, M., ARAI, H. and WAKABAYASHI, K.: Structure-activity relation among macrolide antibiotics in initiation of interdigestive migrating contractions in the canine gastrointestinal tract. Am. J. physiol. 248: G 320 6) ITOH, Z., SUZUKI, T., NAKAYA, M., INOUE, M., ARM, H. and WAKABAYASHI, K. : Erythromycin mimics exogenous motilin in gastrointestinal contractile activity in the dog. Am. J. Physiol. 274: G 688 ` 694, 1984 325, 1985 ` EFFECT OF TE-031 ON GASTROINTESTINAL CONTRACTILE ACTIVITY IN THE DOG: ANALYSIS OF POSSIBLE OCCURRENCE OF SIDE-EFFECTS ON GASTROINTESTINAL TRACT ZEN ITOH, ITSUO TAKAHASHI and KEN NEGISHI GI Laboratories, College of Medical Technology, Gunma University, Gunma To anticipate possible side-effects of TE-031(TE), a new macrolide antibiotic, in the human gastrointestinal tract, its effect on gastrointestinal contractile activity was studied in 5 dogs with erythromycin lactobionate (EM)as control compound. Contractile activity in the stomach and small and large intestine was monitored by means of chronically implanted force transducers. Plasma TE and EM concentrations were estimated by paper disk technique and plasma immunoreactive concentration was measured by a radioimmunoassay for motilin developed in our laboratories. TE(0.1 `3.0 mg/kg)and EM (0.1 `6.0mg/ kg) were administered intravenously and intra- duodenally during the digestive and interdigestive states. TE induced a series of contractions similar to interdigestive migrating contractions, and increased contractile force in stomach and duodenum when given during digestion. Overall response of the gastrointestinal tract to TE and EM was quite similar, though mean activity of TE in inducing stomach contractions was 24.0 }5.1% of EM during the interdigestive and 18.1 }3.4% of EM during the digestve state. On the other hand, plasma TE concentration was significantly higher (at least 2-fold)than that of EM when the same dose was given intra-duodenally. The therapeutic dose of TE could therefore be reduced to half that of EM. We conclude that TE- related side- effects in the human gastrointestinal tract may be significantly less than those of EM, since the total mean relative potency of TE in inducing contractions is estimated at c. 20% of EM and the therapeutic dose of TE is only about half that of EM due to elevated plasma concentrations over a long period of time.

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