Prostaglandin E2-bisphosphonate conjugates: potential agents for treatment of osteoporosis
摘要:
Conjugates of bisphosphonates (potential bone resorption inhibitors) and prostaglandin E-2 (a bone formation enhancer) were prepared and evaluated for their ability to bind to bone and to liberate, enzymatically, free PGE(2). The conjugate 3, an amide at C-1 of PGE(2) proved to be too stable in vivo while conjugate 6, a thioester, was too labile. Several PGE(2), C-15 ester-linked conjugates (18, 23, 24 and 31) were prepared and conjugate 23 was found to bind effectively to bone in vitro and in vivo and to liberate PGE(2) at an acceptable rate. A 4-week study in a rat model of osteoporosis showed that 23 was better tolerated and more effective as a bone growth stimulant than daily maximum tolerated doses of free PGE(2). (C) 1999 Elsevier Science Ltd. All rights reserved.
correlated to the initial feed ratios of monomer to catalyst, confirming the living/controlled manner of the polymerizations. The Mn also increased linearly with the monomer conversion, and all of the isolated polymers showed narrow Mw/ Mns. The polymerization was relatively fast and could be accomplished within several minutes. Such fast livingpolymerization method can be applied to a wide range of diazoacetate
In this paper, the synthesis and characterization of novel oil-soluble fluorinated surfactants were reported. Both Wittig and Wittig-Horner reaction were used for constructing the perfluorinated branch-chain structure, and the latter provided a better method through a three-step synthesisroute which was easy worked up and low cost. The surface tension of novel products in toluene, n-hexane and nitromethane
Analysis of the Destabilization of Bacterial Membranes by Quaternary Ammonium Compounds: A Combined Experimental and Computational Study
作者:Saleh Alkhalifa、Megan C. Jennings、Daniele Granata、Michael Klein、William M. Wuest、Kevin P. C. Minbiole、Vincenzo Carnevale
DOI:10.1002/cbic.201900698
日期:2020.5.15
The mechanism of action of quaternary ammonium compound (QAC) antiseptics has long been assumed to be straightforward membrane disruption, although the process of approaching and entering the membrane has little modeling precedent. Furthermore, questions have more recently arisen regarding bacterial resistance mechanisms, and why select classes of QACs (specifically, multicationic QACs) are less prone
Ester- and amide-containing multiQACs: Exploring multicationic soft antimicrobial agents
作者:Ryan A. Allen、Megan C. Jennings、Myles A. Mitchell、Saleh E. Al-Khalifa、William M. Wuest、Kevin P.C. Minbiole
DOI:10.1016/j.bmcl.2017.03.077
日期:2017.5
on both ester and amide linkages, in a systematic study of mono-, bis-, and tris-cationic QAC species. Antimicrobial activity, red blood cell lysis, and chemical stability were assessed. Antiseptic activity was strong against a panel of six bacteria including two MRSA strains, with low micromolar activity seen in many compounds; amide analogs showed superior activity over ester analogs, with one bisQAC