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GASTROINTESTINAL, HEPATIC, PULMONARY, AND RENAL

Improved Antiulcer and Anticancer Properties of a trans-Resveratrol Analog in Mice

Department of Biochemistry, Dr. B.C. Roy Postgraduate Institute of Basic Medical Sciences and Institute of Post Graduate Medical Education & Research (I.P.G.M.&R.), Kolkata, India (P.G., A.D., S.K.B.); DNA Laboratory, Anthropological Survey of India, Kolkata, India (B.S.); and Bio-Organic Division, Bhabha Atomic Research Centre, Mumbai, India (M.V.D., S.C.)

Despite its potential, use of trans-resveratrol as an anticancer drug is severely constrained because of its tendency to prolong gastric ulceration. We found that in addition to delaying ulcer healing, trans-resveratrol also aggravated acute gastric ulceration induced by the nonsteroidal anti-inflammatory drugs by reducing the synthesis of prostaglandin (PG) E₂ via a specific inhibition of cyclooxygenase (COX)-1 that also hampered angiogenesis. However, for the first time, we showed that the 3'-5'-hydroxylated congener [(E)-HST-1] of trans-resveratrol, synthesized in multigram scale, exerted potential chemotherapeutic property but was nonulcerogenic in nature, rather moderately accelerated healing of indomethacin-induced gastric ulceration. HST-1 did not suppress COX-1, COX-2 expression, and PGE₂ synthesis but reduced the level of inflammatory myeloperoxidase (MPO) activity. The healing was augmented primarily through the nitric oxide synthase (NOS)-dependent pathway. HST-1 treatment induced endothelial NOS (eNOS) expression and reduced inducible NOS (iNOS), resulting in increased eNOS/iNOS ratio. The selective iNOS inhibitor [L-N⁶-(1-iminoethyl) lysine hydrochloride] and nonselective NOS inhibitor (N-nitro-L-arginine methyl ester) treatment revealed that eNOS could be the probable molecular switch to accelerate the indomethacin-induced ulcer healing in HST-1-treated mice. Furthermore, the anticancer effect of HST-1 on U937 and K562 leukemia cell lines was found to be significantly better than that of trans-resveratrol. Overall, these established HST-1 as a potentially better anticancer compound than trans-resveratrol, considering it is devoid of any ulcerogenic side effects. In conclusion, for the first time, we showed that a novel analog of trans-resveratrol, HST-1, was devoid of ulcerogenic adversative effects of trans-resveratrol but retained potentially better anticancer property.

Address correspondence to: Dr. Sandip K. Bandyopadhyay, Department of Biochemistry, Dr. B.C. Roy Post Graduate Institute of Basic Medical Sciences and I.P.G.M.E.&R., 244B, Acharya Jagadish Chandra Bose Road, Kolkata-700 020, India. E-mail: sandipkpc{at}gmail.com