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Popular Abstract in English The secreted cysteine protease inhibitor cystatin C has been thought to exert its functions extracellularly, as a defense against enzymes from leaking lysosomes or invading pathogens. In this thesis we demonstrate that regulation of intracellular proteases by cystatin C is possible, as a result of cellular uptake, and that the uptake can be modulated by molecular engineCystatin C is a cysteine protease inhibitor, aimed for secretion, as it is produced with a signal peptide. Its target enzymes are thought to be the lysosomal cysteine cathepsins and legumain. Cystatin C has been considered to excert its enzyme inhibiting functions extracellularly, as a defense against enzymes from leaking lysosomes or invading pathogens. It was demonstrated by various techniques,

A method for the observation of the three-dimensional structure of intact ectomycorrhizal rhizomorphs is described. The method is based on a combination of clearing the material with KOH followed by staining with congo red and subsequent imaging under a laser scanning confocal microscope (LSCM). The images obtained are of a much higher three-dimensional resolution than those obtained previously by

Kolloider, partiklar i storleksordningen en nanometer till en mikrometer, är inom materialvetenskapen attraktiva byggstenar vid konstruktion av olika material eftersom de spontant organiserar sig i periodiska strukturer. Till skillnad från biologiska kolloider såsom proteiner, röda blodkroppar, bakterier och virus, är de syntetiska kolloider som man har tillgång till inom materialvetenskapen i regColloidal self-assembly is an attractive bottom-up approach to new superstructures and materials with new properties. However, the typical spherical shape and isotropic interaction potential limit the repertoire of ordered structures that can be obtained from synthetic colloids. In order to expand the repertoire of structures, much effort has over the last decades been directed towards the prepara

Abstract: Tissue paper softness relies on two major factors, the bulk softness, which can be indicated by the elasticity of the sheet, and surface softness. Measurement of surface softness is complicated and often requires a multi-step process. A key parameter defining surface softness is the topography of the surface, particularly the crepe structure and its periodicity. Herein, we present a nove

The glomerular structure of the primary olfactory neuropil has long been thought to play an important role in odour coding. In insects, the number of glomeruli in the antennal lobe is limited in most species to fewer than 100 compared with more than 1,000 in vertebrates, making it possible to identify individual glomeruli. A complete three-dimensional atlas of the glomeruli within the antennal lob

This chapter provides an overview of the different optical sectioning methods that enable performing three dimensional (3D) imaging of possibly complex samples. It discusses their benefits and limitations regarding their penetration depth, their imaging speed, their photo-toxic effect or their complexity. Focusing on fluorescence imaging, the chapter dives into approaches that make it possible to

The morphological structure of the nervous system is ultimately the basis of its function. Analyses of the anatomical layout of brain areas, single neuron morphologies, and the synaptic connectivity of neurons are therefore essential for a comprehensive understanding of the computational processes implemented in neuronal networks. Insect brains have long served as models to examine neuronal circui

Purpose: The aim of this study was to describe the morphology, corneal topography and sensitivity in individuals with Dystrophia Helsinglandica. This autosomal dominant corneal disease is characterized by recurrent corneal erosive episodes and progressive subepithelial fibrosis not significantly affecting visual acuity. Methods: The corneas of nine affected and nine unaffected individuals were exa

Popular Abstract in Swedish Glatt muskulatur är nödvändig för funktionen hos de flesta inre organ såsom blodkärl, tarmar, gallblåsa, livmoder, urin och luftvägar. I artärer bildar glatta muskelceller ett cirkulärt lager, som skiljs från blodet genom ett tunt endotelcellslager. Muskelns främsta uppgift är att kontrollera blodkärlens diameter, och därmed blodflödet till de vävnader som de försörjer.Intracellular Ca²⁺ is a key regulator of vascular contractility, and thereby of blood perfusion and pressure. Ca²⁺ signals are essential also for cell migration, proliferation and regulation of numerous enzymes. Besides producing vascular contraction smooth muscle cells may also modulate to a synthetic phenotype and proliferate as an initial stage in the atherosclerotic proce

Glucose-induced insulin secretion in response to a step increase in blood glucose concentrations follows a biphasic time course consisting of a rapid and transient first phase followed by a slowly developing and sustained second phase. Because Type 2 diabetes involves defects of insulin secretion, manifested as a loss of first phase and a reduction of second phase, it is important to understand th

Fractionation of 3T3-L1 adipocyte membranes revealed that PDE3B (phosphodiesterase 3B) was associated with PM (plasma membrane) and ER (endoplasmic reticulum)/Golgi fractions, that insulin-induced phosphorylation/activation of PDE3B was greater in internal membranes than PM fractions, and that there was no significant translocation of PDE3B between membrane fractions. Insulin also induced formatio

A first lesson in physical chemistry invariably starts with an example of water existing in three states, or phases - gaseous (water vapour), liquid (water from the tap) and solid (ice cubes). Such phase transitions are easily observed, but their underlying cause is not so evident. Atoms and molecules are difficult to follow due to their minute size and rapid movements. So, in order to investigateThe effect of microscopic colloid interactions on the resultant macroscopic phase behaviour is a frequently studied topic in soft matter resarch, and lies at the heart of this thesis. Key structural and dynamic properties of colloidal model systems across liquid-solid transitions are tracked using optical imaging techniques. The first studied system comprises of thermosensitive microgels. These ar

Popular Abstract in Swedish Insulin frisätts från B-cellerna i bukspottkörteln (pankreas) när blodsockerhalten ökar över den normala (80-100 mg per dl), exempelvis efter en kolhydrat- och sockerrik måltid. Medan ?friska? B-celler har förmågan att reagera kraftigt redan på små (10%) förändringar i blodsockerhalten, så utvecklar ?ålders-diabetiska? B-celler en blodsockerblindhet och insulinfrisättniEndocrine cells as well as neurons release their hormones and transmitters by regulated exocytosis. In the pancreatic B-cell, stimuli like glucose initiate biochemical and electrical processes that culminate in influx of Ca2+, which then triggers exocytosis of insulin-containing granules. Fusion of the secretory vesicles occurs rapidly upon Ca2+-influx but requires a granule to be ?primed? by an A

Heparan sulfate inhibits the proliferation of normal human lung fibroblasts (HFL-1) but not of a human lung carcinoma cell-line (A549). in this study we investigated possible mechanisms and structural requirements by which anti proliferative heparan sulfates exerts its effects on binding, uptake and subcellular localisation. Both HFL-1 and A549 cells were incubated with I-125- or rhodamine-labeled

In this thesis we discuss the assembly of thermoresponsive microgel particles into small clusters, and their use as colloidal molecules with specific and directional interactions. The underlying goal is to use these particles as advanced building blocks for new types of self- assembled structures with novel or vastly improved properties, and as model particles for investigating fundamental problemIn this thesis we discuss the assembly of thermoresponsive microgel particles into small clusters, and their use as colloidal molecules with specific and directional interactions. The underlying goal is to use these particles as advanced building blocks for new types of self- assembled structures with novel or vastly improved properties, and as model particles for investigating fundamental problem