Objective: To find the different electrophoretic profiles of prion protein in carcinous and individual pericarcinous tissues in lysates of gastric, colon, liver, lung, thyroid, and laryngeal cancers. Methods: Sodium dodecyl sulfate polyacrylamide gel electrophoresis (SDS-PAGE) and Western blot were used to test the amounts and electrophoretic patterns of total PrP and the tolerance of PK (protease K) digestion among six various cancer tissue types. Results: A mass of PrP signals with a large molecular weight were identified in the homogenates of peripheral tissues. The amounts and electrophoretic patterns of total PrP did not differ significantly between carcinous and pericarcinous tissues. PrPs in all types of the tested cancer samples were PK sensitive but showed diversity in the tolerance of PK digestion among various tissue types. Conclusions The study revealed that the included electrophoretic patterns of carcinous and pericarcinous tissues were almost similar. Unlike PrP-specific immunohistochemical assay, evaluation of PrP electrophoretic patterns in the peripheral organs and tissues by Western blot does not reflect tumor malignancy.
Animals ; Blotting, Western ; Brain ; Brain Chemistry ; Cricetinae ; Electrophoresis, Polyacrylamide Gel ; Humans ; Neoplasms/chemistry* ; Prion Proteins/analysis*

Lactoferrin (Lf) is one of the food protein belonged to the innate immune system. Apart from its main biological function of binding and transport of iron ions, lactoferrin also has many other functions and properties such as antibacterial, antiviral, antiparasitic, catalytic, anti-cancer, anti-allergic and radioprotecting. Lf is usually used as additives of food and cosmetics. The research of lactoferrin has been increasingly reported, and the application of lactoferrin as a drug carrier has drawn extensive attention over the recent year. In this paper, researches of lactoferrin as drug carriers are classified and summarized in brain targeting, liver tumor targeting, lung tumor targeting and oral delivery systems according to their different characteristics.
Administration, Oral ; Brain ; Drug Carriers ; Humans ; Lactoferrin ; chemistry ; Neoplasms

Perfusion is a fundamental biological function that refers to the delivery of oxygen and nutrients to tissue by means of blood flow. Perfusion MRI is sensitive to microvasculature and has been applied in a wide variety of clinical applications, including the classification of tumors, identification of stroke regions, and characterization of other diseases. Perfusion MRI techniques are classified with or without using an exogenous contrast agent. Bolus methods, with injections of a contrast agent, provide better sensitivity with higher spatial resolution, and are therefore more widely used in clinical applications. However, arterial spin-labeling methods provide a unique opportunity to measure cerebral blood flow without requiring an exogenous contrast agent and have better accuracy for quantification. Importantly, MRI-based perfusion measurements are minimally invasive overall, and do not use any radiation and radioisotopes. In this review, we describe the principles and techniques of perfusion MRI. This review summarizes comprehensive updated knowledge on the physical principles and techniques of perfusion MRI.
Arteries/chemistry ; Brain Neoplasms/radiography ; Contrast Media/diagnostic use ; Humans ; Magnetic Resonance Imaging/standards/*trends ; Spin Labels ; Stroke/radiography

As a kind of mitochondrial membrane protein with protein kinase activity, phosphatase and tensin homolog deleted on chromosome ten induced kinase 1 (PINK1) is involved in many biological metabolic processes. Since PINK1 had been found to be associated with Parkinson's disease, researchers have been exploring its biological function. PINK1 localizes in the outer mitochondrial membrane and regulates cell function through phosphorylating proteins. PINK1 is involved in mitochondrial function, mitochondrial morphology and mitochondrial autophagy, but the regulatory pathway is not yet clear. PINK1 is expressed widely in many tissues with a variety of biological activity, especially in tissues with high energy consumption. It may therefore be involved in the development and regulation of many diseases. Mutations in PINK1 were originally discovered to cause autosomal recessive Parkinson's disease. Recently some research has revealed that PINK1 is related to the development of neonatal hypoxic-ischemic encephalopathy, cancer, diabetes and other diseases. Studying and exploring the biological functions of PINK1 will facilitate the identification of the targets for therapeutic intervention for its related diseases. This review article mainly focuses on recent studies about the biological function and related diseases of PINK1.
Autophagy ; Diabetes Mellitus, Type 2 ; etiology ; Humans ; Hypoxia-Ischemia, Brain ; etiology ; Mitochondria ; physiology ; Neoplasms ; etiology ; Protein Kinases ; chemistry ; physiology

Clinical microdialysis allows a discrete volume of the brain to be sampled for neurochemical analysis of neurotransmitters, metabolites, biomarkers, and drugs. The technique can be safely used in humans intraoperatively, in the intensive care unit, and in ambulatory settings. Microdialysis probes, micropumps, and analytical equipment are commercially available and have been used extensively for neurochemical monitoring in traumatic brain injury, stroke, and subarachnoid hemorrhage. There has been very limited use of microdialysis in neuro-oncology, but this technique has great promise in the study of the basic neurochemistry of brain tumors, alterations in neurochemistry in response to therapy, and the pharmacokinetics of chemotherapeutic agents. Microdialysis probes may also be used to deliver drugs while simultaneously permitting monitoring of neurochemical changes induced by this therapy.
Animals ; Antineoplastic Agents ; pharmacokinetics ; therapeutic use ; Biomarkers ; metabolism ; Brain Neoplasms ; chemistry ; metabolism ; therapy ; Glioma ; chemistry ; metabolism ; therapy ; Humans ; Microdialysis ; instrumentation ; methods ; Monitoring, Physiologic

Recent evidence shows that transcriptional silencing as a consequence of hypermethylation of CpG islands is an important mechanism in the inactivation of p16INK4 tumor suppressor gene. This study is designed to clarify the significance of p16INK4 hypermethylation in 23 cases of glioblastomas (GBMs) by methylation-specific polymerase chain reaction (PCR) and p16 immunostaining. Fourteen cases (60.9%) out of 23 GBMs revealed hypermethylation on p16. p16 immunostaining revealed that 13 (93%) of these 14 hypermethylation cases showed complete loss of immunoreactivity and only one (7%) case retained immunoreactivity. Among 9 methylation-negative cases, 4 were immunonegative, which might be related to mutations or deletions other than hypermethylation. The most significant finding was that of 17 cases with immunonegativity, 13 cases (76.5%) showed hypermethylation. We reconfirmed that p16 hypermethylation may be one of the major mechanisms of tumorigenesis of GBMs and the results between the methylation specific-PCR study and p16 immunostaining had a good correlation.
5' Untranslated Regions/metabolism* ; 5' Untranslated Regions/genetics ; Adult ; Antisense Elements (Genetics) ; Brain Neoplasms/pathology ; Brain Neoplasms/genetics* ; Brain Neoplasms/chemistry ; CpG Islands/physiology* ; DNA Methylation* ; Female ; Gene Silencing/physiology ; Glioblastoma/pathology ; Glioblastoma/genetics* ; Glioblastoma/chemistry ; Human ; Male ; Middle Age ; Polymerase Chain Reaction ; Protein p16/genetics* ; Protein p16/analysis

Alzheimer Disease ; metabolism ; Animals ; Brain ; metabolism ; Calcium-Binding Proteins ; biosynthesis ; chemistry ; genetics ; Gastrointestinal Tract ; metabolism ; Humans ; Islets of Langerhans ; metabolism ; Neoplasms ; metabolism ; RNA, Messenger ; metabolism ; Secretagogins ; Thyroid Gland ; metabolism

OBJECTIVETo establish a method for screening cysteinyl leukotriene receptor 2 (CysLT(2)) antagonists and to preliminarily screen a series of synthetic compounds.

METHODSRat glioma cell line (C6 cells) highly expressing CysLT(2) receptor was used. Intracellular calcium concentration was measured after stimulation with the agonist LTD(4),which was used to screen compounds with antagonist activity for CysLT(2) receptor. Bay u9773, a CysLT1/CysLT(2) receptor non-selective antagonist, and AP-100984, a CysLT(2) receptor antagonist, were used as control.

RESULTPT-PCR showed a higher expression of CysLT(2) receptor in C6 cells. LTD(4) at 1 mumol/L significantly increased intracellular calcium in C6 cells; the maximal effect was about 37.5% of ATP, a positive stimulus.LTD(4)-induced increase of intracellular calcium was blocked by CysLT(2) receptor antagonists, but not by CysLT(1) receptor antagonists. Among the synthetic compounds, D(XW-)1,2,13,23,29 and 30 inhibited LTD(4)-induced increase of intracellular calcium.

CONCLUSIONLTD(4)-induced change in intracellular calcium in C6 cells can be used as a screening method for CysLT(2) receptor antagonists. The compounds, D(XW-)1,2,13,23,29 and 30, possess antagonist activity for CysLT(2) receptor.

Animals ; Brain Neoplasms ; pathology ; Cell Line, Tumor ; Drug Evaluation, Preclinical ; methods ; Glioma ; pathology ; Leukotriene Antagonists ; isolation & purification ; Leukotriene D4 ; metabolism ; pharmacology ; Rats ; Receptors, Leukotriene ; chemistry

Actins ; metabolism ; Adult ; Brain Neoplasms ; metabolism ; pathology ; surgery ; Desmin ; metabolism ; Diagnosis, Differential ; Dura Mater ; chemistry ; pathology ; Female ; Granuloma, Plasma Cell ; metabolism ; pathology ; surgery ; Humans ; Immunohistochemistry ; Meningeal Neoplasms ; pathology ; Meningioma ; pathology ; Neoplasms, Muscle Tissue ; metabolism ; pathology ; surgery ; Vimentin ; metabolism

We synthesized the superparamagnetic paclitaxel nanoparticles from modified chitosan tangling around Fe3O4 ferrofluid and taxol, and observed the nanoparticles with transmission electronic microscopy (TEM). Then we evaluated the paramagnetism of the particles by vibration specimen magnetometer (VSM) and tested their cytotoxicity with flow cytometry (FCM). The prepared nanoparticle solution was black without any floccule or sediment and appeared transparent after diluted. The nanoparticles were spherical and dispersed in water with mean diameter of 15 nm under TEM and showed superparamagnetic character. FCM test showed the nanoparticles had significant toxic effects against malignant astrocytoma U251 cell lines, equal to taxol alone. These results showed that the superparamagnetic nanoparticle not only enhanced the solubility of paclitaxel in water, but also was superparamagnetic and cytotoxic, which make suitable tools for magnetic targeting chemotherapy of brain gliomas.
Antineoplastic Agents, Phytogenic ; pharmacology ; Apoptosis ; drug effects ; Brain Neoplasms ; pathology ; Cell Line, Tumor ; Chitosan ; pharmacology ; Drug Carriers ; chemistry ; Drug Compounding ; methods ; Ferric Compounds ; Glioma ; pathology ; Humans ; Magnetics ; Metal Nanoparticles ; chemistry ; Nanoparticles ; Paclitaxel ; pharmacology