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Tumor-pH-Sensitive PLLA-Based Microsphere with Acid Cleavable Acetal Bonds on the Backbone for Efficient Localized Chemotherapy.

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Nanoparticle- and microsphere-based drug delivery systems (DDSs) have attracted wide attention in cancer therapy; those DDSs that are responsive to tumor environment can selectively identify tumor and normal tissues and therefore have shown enhanced anticancer efficacy and alleviated systemic

Biological mechanisms of action of novel C-10 non-acetal trioxane dimers in prostate cancer cell lines.

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The mechanisms of action of three C-10 non-acetal trioxane dimers (TDs) were examined in human (LNCaP) and mouse (TRAMP-C1A and -C2H) prostate cancer cell lines. 1 (AJM3/23), 2 (GHP-TM-III-07w), and 3 (GHP-KB-06) inhibited cell growth with 3 being the most potent in C1A (GI50 = 18.0 nM), C2H (GI50 =

The selective cytotoxic activity in breast cancer cells by an anthranilic alcohol-derived acyclic 5-fluorouracil O,N-acetal is mediated by endoplasmic reticulum stress-induced apoptosis.

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Advance in the knowledge of molecular biology has thrown light on many aspects of apoptosis regulation mechanisms. This has allowed a change in anti-cancer therapy trends, from classic cytotoxic strategies to the development of new non-harmful therapies which target the apoptosis response

The Synthesis and Biological Characterization of Acetal-Free Mimics of the Tumor-Associated Carbohydrate Antigens.

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Carcinomas express unique carbohydrates, known as tumor-associated carbohydrate antigens (TACAs), on their surface. These are potential targets for anticancer vaccines; however, to date, no such vaccine has reached the clinic. One factor that may complicate the success of this effort is the lability

Synthesis of the cyclic and acyclic acetal derivatives of 1-(3-C-ethynyl-beta-D-ribo-pentofuranosyl)cytosine, a potent antitumor nucleoside. Design of prodrugs to be selectively activated in tumor tissues via the bio-reduction-hydrolysis mechanism.

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We have designed and synthesized the acetal derivatives of 1-(3-C-ethynyl-beta-D-ribo-pentofuranosyl)cytosine (ECyd, 1), the 2',3'-O-nitrobenzylidene derivatives 2 and 3 and the 5'-O-(alkoxy)(nitrophenyl)methyl derivatives 6-10 as potential prodrugs of ECyd. These prodrugs can be selectively

Acetal-linked paclitaxel prodrug micellar nanoparticles as a versatile and potent platform for cancer therapy.

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Endosomal pH-activatable paclitaxel (PTX) prodrug micellar nanoparticles were designed and prepared by conjugating PTX onto water-soluble poly(ethylene glycol)-b-poly(acrylic acid) (PEG-PAA) block copolymers via an acid-labile acetal bond to the PAA block and investigated for potent growth

From a classic approach in cancer chemotherapy towards differentiation therapy: acyclic and cyclic seven-membered 5-fluorouracil O,N-acetals.

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Novel derivatives of 5-fluorouracil (5-FU) possessing a broader spectrum of antitumor activity and fewer toxic side effects than 5-FU have been sought. Herein, we report three different types of 5-FU O,N-acetals: a) a novel class of 5-fluorouracil-containing acyclonucleosides. The antitumor

Antiproliferative activity, cell-cycle dysregulation, and cellular differentiation: salicyl- and catechol-derived acyclic 5-fluorouracil O,N-acetals against breast cancer cells.

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Herein we report the preparation and biological activity of three compounds with the general formula 1-[2-(5-substituted-2-hydroxybenzyloxy)-1-methoxyethyl]-5-fluorouracil. A catechol-derived compound such as 1-[3-(2-hydroxyphenoxy)-1-methoxypropyl]-5-fluorouracil and two salicyl-derived compounds

Chiral bis-acetal porphyrazines as near-infrared optical agents for detection and treatment of cancer.

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We report the preparation of chiral oxygen atom-appended porphyrazines (pzs) as biomedical optical agents that absorb and emit in the near-IR wavelength range. These pzs take the form M[pz(A(4-n)B(n))], where "A" and "B" represent moieties appended to the pz's pyrrole entities, A = (2R,3R)

Inhibition of phorbol ester-induced tumor promotion in mice by vitamin A analog and anti-inflammatory steroid.

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The effects of a vitamin A analog, TMMP ethyl retinoate [or ethyl-9-(4-methoxy-2,3,6-trimethylphenyl)-3,7-dimethyl-trans-2,4,6,8-nonatetraenoate] (abbreviated Ro 10-9359), and an anti-inflammatory steroid, fluocinolone acetonide (or 6 alpha, 9 alpha-difluoro-11 beta, 16 alpha,

DHA and pGPMA Dual Modified pH Sensitive Polymeric Micelles for Target Treatment of Liver Cancer.

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In clinical therapy, the poor prognosis of hepatocellular carcinoma (HCC) is mainly attributed to the failure of chemotherapeutical agents to accumulate in tumor as well as lack of potency of tumor penetration. In this work, we developed actively tumor-targeting micelles with pH-sensitive linker as

Synthesis and evaluation of dihydroartemisinin and dihydroartemisitene acetal dimers showing anticancer and antiprotozoal activity.

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Twelve artemisinin acetal dimers were synthesized and tested for antitumor activity in the National Cancer Institute (NCI) in vitro human tumor 60 cell line assay, producing a mean GI(50) concentration between 8.7 (least active) and 0.019 microM (most active). The significant activity of the

Efficacious delivery of protein drugs to prostate cancer cells by PSMA-targeted pH-responsive chimaeric polymersomes.

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Protein drugs as one of the most potent biotherapeutics have a tremendous potential in cancer therapy. Their application is, nevertheless, restricted by absence of efficacious, biocompatible, and cancer-targeting nanosystems. In this paper, we report that

Cyclophosphamide potentiation and aldehyde oxidase inhibition by phosphorylated aldehydes and acetals.

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Fourteen phosphorylated acetals and aldehydes were synthesized for testing in vitro as inhibitors or substrates of aldehyde oxidase, an enzyme involved in the conversion of aldophosphamide to inactive carboxyphosphamide, and for concurrent in vivo administration with cyclophosphamide to mice bearing

Indomethacin-grafted and pH-sensitive dextran micelles for overcoming inflammation-mediated multidrug resistance in breast cancer.

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We first synthesized indomethacin (IND)-grafted dextran copolymer by acetal or ester linkage, which self-assembled with doxorubicin (DOX) into prodrug micelles (ID_AC/DOX or ID_ES/DOX) with the size of ∼200 nm. In vitro drug release test verified ID_AC/DOX could trigger

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