Recently, drug delivery materials have become the hotspot of medical study. Suitable delivery material plays an important role in constructing an excellent drug delivery system. Silk fibroin is a naturally occurring protein polymer with excellent biocompatibility, remarkable mechanical properties, biodegradability and outstanding processability. Due to its unique properties, silk fibroin has become a favorable carrier material for the incorporation and delivery of a range of therapeutic agents. Based on the structure and characteristics of silk fibroin, this article provides an overview of the recent research progress of silk fibroin used as drug delivery materials.
Biocompatible Materials ; Drug Delivery Systems ; Fibroins ; chemistry

Objective To explore the early diagnostic value of carcino-embryonic antigen (CEA) immunocytochemistry examination combined with laser scanning confocal microscope (LSCM) in the patients with meningeal carcinomatosis (MC).Methods The patients were divided into experimental group (patients with MC) and control group (patients without MC).Thermo electron corporation shandon cytospin 4 centrifuge was used in the cytologic examination of cerebrospinal fluid (CSF),whose function was to produce a monolayer of cells onto a glass slide from CSF.Giemsa staining was used in 42 cases.The CEA immunocytochemistry staining was used in 29 cases and 20 controls.The double immunofluorescence staining was used in 17 cases and 20 controls.SP staining method was used in the CEA and the results were observed under the light microscope.Nuclear DNA and CEA were stained with fluorescent probe DAPI and Cy5 respectively and the results of double immunofluorescenee staining were observed by the laser scanning confocal microscope.Results There was a high positive rate in cytologic examination of CSF,and malignant cells were found in all of 42 cases for repeated CSF testing.The positive rate of routine CSF cytologic examination and CEA immunecytochemistry examination was 85.7% (36/42) and 79.3% (23/29) respectively in the first CSF specimens.There were 17 cases using double immunofluorescence staining and observed by LSCM,and the positive rate was 13/17.Compared with experimental group and control group,fluorescent value both nuclear DNA (CEA(+) 1694.04±478.06,CEA(-)1543.04±364.71,control group 603.72±178.04,t=21.386,23.144,both P<0.01) and CEA (CEA(+)1407.04±275.30,control group 202.51±54.05,t=42.934,P<0.01) were significantly different.Conclusion Immunocytochemistry examination of CSF is an important early qualitative diagnosis method for MC.LSCM improved the level of locating,qualitative and quantitative diagnosis of MC.

A series of novel sorafenib analogues were designed and synthesized. The cytotoxic activities of these compounds were tested in four tumor cell lines. Some of the compounds showed potent antiproliferative activity against the tested cell lines with IC50 = 4-20 micromol x L(-1). Some compounds demonstrated competitive antiproliferative activities to sorafenib against tested cancer cell lines. Among them, compound 7c demonstrated significant inhibitory activities on ACHN, HCT116 and MDA-MB-231 cell lines with IC50 values of 9.01, 4.97, 6.61 micromol x L(-1), respectively.

Objective The lyophilized pilose antler water extract(PAE) was isolated,and their cell proliferation on PC12 cells was observed.Methods S-200 Size-exclusive gel and DEAE negative ion-exchange liquid chromatograph were employed to fractionate the PAE.SDS-PAGE was employed to analyze the proteins composition of PAE.The protein concentration was determined by Folin-Phenol assay.The proliferation rates of PC12 cells were measured by MTT assay.Results The proliferation rate of PAE on PC12 cells at 13.3 mg/mL was 47%(P

A novel series of sorafenib analogs containing 2-picolinyl hydrazide moiety were designed and synthesized. In vitro, most of synthesized compounds have antiproliferation activity on MDA-MB-231, ACHN, HepG2, Mia-PaCa-2 and SW1990 cell lines tested by MTT assay. It is worth noting that the antitumor activities of compounds 2c, 2d and 2f are more potent than that of sorafenib on pancreatic cancer cells Mia-PaCa-2 and SW1990, and the activities of compounds 3f and 3g are 2-3 times than that of sorafenib on human hepatocellular carcinoma HepG2 cell line.

Objective To obtain sufficient recombinant VP2 protein of human Bocavirus and establish it's seroepidemiology assying methord.Methord The capsid protein VP2 DNA genes of HBoV1 and 2 were optimized in accordance with the usage of the favorite codons in E.coil so as to enhance its protein expression in prokaryotic expressing system.The protein was purified by Ni-NTA column,and its antigenicity was determined by Western Blot.Then establish ELISA to detect the specific anti-VP2 IgG antibodies against HBoV1 and 2 in healthy children aged 3 - 6 years in Nanjing,China.Results The recombinant protein 6 × His-VP2 was produced in a larger quantity at 25℃ induced by IPTG (lmmol/L) over night and purified by Ni-NTA column.Seropositive rates of HBoV1and 2 were 62.2％ and 55.5％ and their mixed seropositivity was 37％.Conclusion The optimizing expression of the capsid protein VP2 from human Bocavirus constructed successfully and get a high yield under certain conditions.The established ELISA could be used to further analyze seroepidemiology of HBoV in china.