ABSTRACT
The cyanosporasidesâ A-F are a collection of monochlorinated benzenoid derivatives isolated from the marine actinomycetes Salinispora and Streptomyces sp. All derivatives feature one of two types of cyanocyclopenta[a]indene frameworks, which are regioisomeric in the position of a single chlorine atom. It is proposed that these chloro-substituted benzenoids are formed biosynthetically through the cycloaromatization of a bicyclic nine-membered enediyne precursor. Herein, we report the synthesis of such a bicyclic precursor, its spontaneous transannulation into a p-benzyne, and its differential 1,4 hydrochlorination reactivity under either organochlorine or chloride-salt conditions. Our bioinspired approach culminated in the first regiodivergent total synthesis of the aglycons A/F and B/C, as well as cyanosporasidesâ D and E. In addition, empirical insights into the site selectivity of a natural-like p-benzyne, calculated to be a ground-state triplet diradical, to hydrogen, chlorine, and chloride sources are revealed.
Subject(s)
Benzene Derivatives/chemistry , Biomimetics , Chlorine/chemistryABSTRACT
A man in his early seventies underwent low anterior resection and partial resection of the liver for the rectal cancer and liver metastasis. However, 4 months after the surgery, he was found to have a liver tumor at S5 and S7 by abdominal CT scan. Then, he underwent chemotherapy (mFOLFOX6), but the metastatic tumor was progressive. We selected FOLFIRI + cetuximab regimen for second-line therapy to resect the metastatic tumor. As the metastatic lesion was become smaller after 4-course of the regimen including cetuximab, we decided to perform a radical resection. We conducted a right lobectomy of the liver, and the tumor was completely resected.
Subject(s)
Adenocarcinoma/therapy , Antibodies, Monoclonal/administration & dosage , Antineoplastic Agents/administration & dosage , Antineoplastic Combined Chemotherapy Protocols/administration & dosage , Colonic Neoplasms/pathology , Hepatectomy , Liver Neoplasms/secondary , Liver Neoplasms/therapy , Adenocarcinoma/drug therapy , Adenocarcinoma/pathology , Aged , Antibodies, Monoclonal, Humanized , Camptothecin/administration & dosage , Camptothecin/analogs & derivatives , Cetuximab , Combined Modality Therapy , Fluorouracil/administration & dosage , Humans , Leucovorin/administration & dosage , MaleABSTRACT
A woman in her fifties underwent a right hemicolectomy (D3) for cancer of the ascending colon in October 2007, definitively and pathologically diagnosed as papillary adenocarcinoma invading to the subserosa, and no metastasis was detected to lymph node. But 13 months after the surgery, she was found to have a mass near the anastomosis by an abdominal CT scan. Colonoscopy showed an evaluating lesion with ulcer in the anal side of the anastomosis. We tried to resect the metastasis, but it was not resectable because of the invasion to the pancreas. The mFOLFOX regimen was effective. After the chemotherapy (6 courses), we decided to perform a radical resection. We conducted pancreatoduodenectomy in May 2009. She is still alive 12 months after surgery.
Subject(s)
Adenocarcinoma, Papillary/pathology , Adenocarcinoma, Papillary/therapy , Antineoplastic Combined Chemotherapy Protocols/therapeutic use , Colonic Neoplasms/pathology , Colonic Neoplasms/therapy , Lymphatic Metastasis/pathology , Pancreatic Neoplasms/secondary , Pancreatic Neoplasms/therapy , Duodenum/surgery , Female , Fluorouracil/therapeutic use , Humans , Leucovorin/therapeutic use , Middle Aged , Neoplasm Recurrence, Local , Organoplatinum Compounds/therapeutic use , PancreatectomyABSTRACT
Understanding of the hydration state is an important issue in the chemomechanical energetics of versatile biological functions of polymerized actin (F-actin). In this study, hydration-state differences of F-actin by the bound divalent cations are revealed through precision microwave dielectric relaxation (DR) spectroscopy. G- and F-actin in Ca- and Mg-containing buffer solutions exhibit dual hydration components comprising restrained water with DR frequency f2 (