African trypanosomes are tsetse fly transmitted protozoan parasites responsible for human African trypanosomiasis, a disease characterized by a plethora of neurological symptoms and death. How the parasites under microvascular shear stress (SS) flow conditions in the brain cross the blood-brain barrier (BBB) is not known. In vitro studies using static models comprised of human brain microvascul...

BACKGROUND Drug and antibody delivery to brain metastases has been highly debated in the literature. The blood-tumor barrier (BTB) is more permeable than the blood-brain barrier (BBB), and has shown to have highly functioning efflux transporters and barrier properties, which limits delivery of targeted therapies. METHODS We characterized the permeability of 125I-trastuzumab in an in-vivo, and...

Neisseria meningitidis is a commensal bacterium of the human nasopharynx. Occasionally, this bacterium reaches the bloodstream and causes meningitis after crossing the blood-brain barrier by an unknown mechanism. An immunohistological study of a meningococcal sepsis case revealed that neisserial adhesion was restricted to capillaries located in low blood flow regions in the infected organs. Thi...

membrane permeability and p-glycoprotein (p-gp) efflux system are regulating factors in the drug brain penetration. recently, some drug delivery systems have been developed to overcome these limitations. in this study, metoclopramid has been encapsulated in plga nanoparticles using the emulsification/solvent evaporation technique for in vitro evaluation of the effect of plga nanoparticles on bb...

Pyridostigmine bromide is a carbamate AChE inhibitor with a positively charged “quaternary ammonium” group, which is believed to prevent its penetration through the “blood-brain barrier,” a layer of cells that controls which substances may penetrate from the general circulation into the brain. Therefore, side effects of PB are typically those of heightened peripheral cholinergic activity (nicot...

multiple sclerosis (ms) is one of the most important autoimmune diseases recognized by demyelination and axonal lesion. it is the most common cause of disability in the young population. various immunomodulatory and immunosuppressive therapies, including different formulations of interferon beta (ifnβ), glatiramer acetate (ga), mitoxantrone, and natalizumab are available for this disease. howev...