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Beige mice (C57BL/6-bgJ/bgJ) express the Chediak-Higashi syndrome, a genetically determined constellation of morphologic and functional abnormalities affecting cells that synthesize cytoplasmic granules; a similar disorder also occurs in humans and several other mammalian species. We used a computer-assisted morphometric approach to identify and quantitate(More)
We used a morphometric and autoradiographic approach to analyze changes in specific cytoplasmic granules and cytoplasmic lipid bodies associated with human lung mast cell degranulation. Mast cells were dissociated from lung tissue by enzymatic digestion and were then enriched to purities of up to 99% by countercurrent centrifugation elutriation and recovery(More)
The areas of 2327 mast cell granules in transmission electron micrographs of sections of peritoneal mast cells from adult rats were measured by digitized planimetry. A histogram constructed using equivalent volumes calculated from the measured areas assuming approximation of the granules to spheres showed a periodic multimodal distribution in which the(More)
Ataxia-telangiectasia (A-T) is a human genetic disorder caused by mutational inactivation of the ATM gene. A-T patients display a pleiotropic phenotype, in which a major neurological feature is progressive ataxia due to degeneration of cerebellar Purkinje and granule neurons. Disruption of the mouse Atm locus creates a murine model of A-T that exhibits most(More)
OBJECTIVE The goal of these studies was to define the anatomic pathways by which circulating macromolecules extravasate from the hyperpermeable microvessels that supply tumors and from normal venules that have been rendered hyperpermeable by vasoactive mediators. METHODS Extravasation pathways of circulating macromolecular tracers were followed by several(More)
We used cationized colloidal gold (CCG) to investigate the distribution of anionic sites in different secretory granules of mouse pancreatic acinar cell regranulation. Localization of anionic sites with CCG was carried out on ultrathin sections of a mouse pancreas, fixed in Karnovsky's fixative and OsO4 and embedded in Araldite. After pilocarpine-stimulated(More)
Mast cells from rats aged 1 month, 3 months and 5 to 7 months were compared with respect to cell size and secretory granule size and number. With increasing age there was an increase in mean total cell volume accounted for almost entirely by an increase in mean total granule volume/cell even though there was no apparent increase in the number of granules.(More)
Early endosomes and a perinuclear, Rab-11-positive compartment have been implicated in the recycling of internalized receptors. In this study, we show that synaptotagmin III (Syt III), a member of the Syt family of proteins, is required for the formation and delivery of cargo to the perinuclear endocytic recycling compartment (ERC). We demonstrate that rat(More)
The potential therapeutic value of combinatorial regimens based on an EGF receptor tyrosine kinase inhibitor (TKI) and autophagy inducing drugs was evaluated by comparing their molecular impacts on H1299 and A549 non-small cell lung cancer (NSCLC) cells, which overexpress wild type EGF receptor, but are either deficient or have wild type p53 alleles,(More)
Cancellous microanatomy, bone remodelling, and hematopoietic tissue were studied in iliac crest and femoral neck biopsies taken intraoperatively in 102 consecutive patients with displaced intracapsular fractures. About half of the femoral biopsies had osteopenia, and most showed replacement of hematopoietic tissue by fat cells, with absence of osteoblasts(More)