Institut für Pharmakologie und Toxikologie
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Streptococcus pneumoniae is one of the major causes of bacterial meningitis, which mainly affects young infants in the developing countries of Africa, Asia (esp. India) and South America, and which has case fatality rates up to 50% in those regions. Bacterial meningitis comprises an infection of the meninges and the sub-meningeal cortex tissue of the brain, whereat the presence of pneumolysin (PLY), a major virulence factor of the pneumococcus, is prerequisite for the development of a severe outcome of the infection and associated tissue damage (e. g. apoptosis, brain edema, and ischemia). Pneumolysin belongs to the family of pore forming, cholesterol-dependent cytolysins (CDCs), bacterial protein toxins, which basically use membrane-cholesterol as receptor and oligomerize to big aggregates, which induce cell lysis and cell death by disturbance of membrane integrity. Multiple recent studies, including this work, have revealed a new picture of pneumolysin, whose cell-related properties go far beyond membrane binding, pore formation and the induction of cell death and inflammatory responses. For a long time, it has been known that bacteria harm the tissues of their hosts in order to promote their own survival and proliferation. Many bacterial toxins aim to rather hijack cells than to kill them, by interacting with cellular components, such as the cytoskeleton or other endogenous proteins. This study was able to uncover a novel capacity of pneumolysin to interact with components of the actin machinery and to promote rapid, actin-dependent cell shape changes in primary astrocytes. The toxin was applied in disease-relevant concentrations, which were verified to be sub-lytic. These amounts of toxin induced a rapid actin cortex collapse in horizontal direction towards the cell core, whereat membrane integrity was preserved, indicating an actin severing function of pneumolysin, and being consistent with cell shrinkage, displacement, and blebbing observed in live cell imaging experiments. In contrast to neuroblastoma cells, in which pneumolysin led to cytoskeleton remodeling and simultaneously to activation of Rac1 and RhoA, in primary astrocytes the cell shape changes were seen to be primarily independent of small GTPases. The level of activated Rac1 and RhoA did not increase at the early time points after toxin application, when the initial shape changes have been observed, but at later time points when the actin-dependent displacement of cells was slower and less severe, probably presenting the cell’s attempt to re-establish proper cytoskeleton function. A GUV (giant unilamellar vesicle) approach provided insight into the effects of pneumolysin in a biomimetic system, an environment, which is strictly biochemical, but still comprises cellular components, limited to the factors of interest (actin, Arp2/3, ATP, and Mg2+ on one side, and PLY on the other side). This approach was able to show that the wildtype-toxin, but not the Δ6 mutant (mutated in the unfolding domain, and thus non-porous), had the capacity to exhibit its functions through a membrane bilayer, meaning it was able to aggregate actin, which was located on the other side of the membrane, either via direct interaction with actin or in an Arp2/3 activating manner. Taking a closer look at these two factors with the help of several different imaging and biochemical approaches, this work unveiled the capacity of pneumolysin to bind and interact both with actin and Arp2 of the Arp2/3 complex. Pneumolysin was capable to slightly stabilize actin in an actin-pyrene polymerization assay. The same experimental setup was applied to show that the toxin had the capacity to lead to actin polymerization through activation of the Arp2/3 complex. This effect was additionally confirmed with the help of fluorescent microscopy of rhodamine (TRITC)-tagged actin. Strongest Arp2/3 activation, and actin nucleation/polymerization is achieved by the VCA domain of the WASP family proteins. However, addition of PLY to the Arp2/3–VCA system led to an enhanced actin nucleation, suggesting a synergistic activation function of pneumolysin. Hence, two different effects of pneumolysin on the actin cytoskeleton were observed. On the one hand an actin severing property, and on the other hand an actin stabilization property, both of which do not necessarily exclude each other. Actin remodeling is a common feature of bacterial virulence strategies. This is the first time, however, that these properties were assigned to a toxin of the CDC family. Cytoskeletal dysfunction in astrocytes leads to dysfunction and unregulated movement of these cells, which, in context of bacterial meningitis, can favor bacterial penetration and spreading in the brain tissue, and thus comprises an additional role of pneumolysin as a virulence factor of Streptococcus pneumonia in the context of brain infection.
It is shown by means of IR. spectroscopic methodsthat nigericin and monensin bave a cyclic conformation similar to that of their silver salts. Camplex fonnation constants with sodium and potassium ions follow the selectivity order determined by EMF. measurements on liquid membranes: nigericin: K\(^+\) >Rb\(^+\)> Na\(^+\)> Cs\(^+\) >Li\(^+\); monensin: Na\(^+\)> K\(^+\) >Li\(^+\)> Rb\(^+\)> Cs\(^+\). Transport experiments show that nigericin and monensin facilitate the diffusion of potassium ions across model membranes, although in electrolytic transport experiments the permeability is not affected.
The structure of monensin, C36H620 11 , has been deterrnined by X-ray analysis of its crystalline monohydrate (orthorhombic, a = 15.15, b = 23.61, c = 10.65 A, Z = 4, space group P212121). Phases were assigned by direct methods, malring use of the 'tangent formula'. Although the conformation of the free acid resembles that of the silver salt in being cyclic, there are differences in the hydrogen bonding pattern. These featurcs are discussed in relation to the cornplexation of metal ions by m.onensin.
The thermodynainic parameters ΔH0, ΔG0 and ΔS0 - and thereby the equilibrium constants - for the complexation of the carrier antibiotics nigericin and monensin with sodium and potassium ions in methanol at 25°C have been determined by microcalorimetry. Tbc results are discussed in terms of the nature of the interaction between ligands and cations.
Aryl hydrocarbon hydroxylase (AHH) has been measured in male rat Jiver nucJei and microsomes after treatment of adult animals with various inducers for up to 14 days. After daily i.p. injections of 3-methylcholanthrene (MC, 20 mg/kg) the nuclear activity increased to a maximum of 600 per cent of the control activity after 4 days whereas the microsomal activity was 400 per cent of control at the same date. After 12 days, both activities equilibrated at 400 per cent. A similar time course was found after a single i.p. injection of 2,3,7,8-tetrachloro-dibenzo-p-dioxin (TCDD, 0.01 mg/kg) with an induction to .500 and 300 per cent for nuclei and microsomes, respectiveJy. after 2 days, and to 400 per cent for both after 12 days. PhenobarbitaJ (PB) was given continuously in the drinking water (I g/1) and induced the microsomal activity to 200 per cent after 8 days and 170 per cent after 14 days. The nuclear activity was only slightly induced to a constant Ievei of 130 per cent between day 8 and 14. Dieldrin did not significantly increase the microsomal activity after daiJy i.p. injections (20 mg/kg), but the nuclear activity raised to 200 per cent after 3 days and levelled down tocontrol valuesafter 12 days. Other inducers tested were benz[a)anthracene (BA), hexachlorobenzene (HCB} and 1,1.1-trichloro-2,2-bis(p-chlorophenyl)ethane (DDT). The induction pattern with BA was similar tothat of MC, a modeJ compound for the group of cytochrome P448 inducers. The induction by HCB and DDT resembled that by PB. a typical cytochrome P450 inducer.
Wlth radioactive compound of high specific activity, the binding of carcinogene to DNA can be measured wlth doses that are ineffective ln long-term studies. The binding of tritiated benzo(a )pyrene to liver DNA of adult male rats has been determined 50 hr after a singie l.p. injection of doses between 40 1'9/kg and 4 mg/kg. The doseresponse relationship is linear up to 1 mg/kg, shows a step towards 2 mg/kg, and gives a shallow linear slope above that value. The observed binding ranges from 1.7 to 180 nmoles benzo(a)pyrene per mole DNA phosphate. The nonlinearity could be due to an induction of metabolizing enzymes. The microsomal aryl hydrocarbon hydroxylase activity increases significantly 24 hr after a single dose of 4 mg/kg and 48 hr after doses of 2 and 4 mg/kg, but no induction Ia found with 1 mg/kg. The binding from an equimolar dose is 35 times lower than the one found on mouse skin DNA and 300 times lower than that of N,Ndlmethylnitrosamine in rat liver. A good correlatlon exiats to the respective tumor formation in long-term studles.
Thecovalent bindingof [6,7-\(^3\)H]ethinylestradiol (EE)and [6,7-\(^3\)H]estrone (E) to liver DNA of 200 g female ratswas measured 8 h after the administration of 80 \(\mu\)g (9.2 mCi) estrogen by gavage. The binding is 1.5 for EE and 1.1 for E, expressedas binding to DNA/dose, in units of \(\mu\)mol hormonefmol DNA phosphate/mmole honnone/kg body wt. It is in the same order of magnitude as for benzene and about 10 000 tim es below the binding of typical liver carcinogens, such as aflatoxin B\(_1\) or N,N-dimethylnitrosamine.
The lnfluence of mlcrosomal and nuclear aryl hydrocarbon hydroxylase (AHH) actlvlty on the covalent blndlng of [G·3H]benzo(a )pyrene to rat llver DNA was evaluated in viWJ. lnductlon of mlcrosomal AHH was obtalned alter phenobarbltal treatment (160% of control), whlch also lncreased DNA blndlng to 190%, but left the nuclear actlvlty unchanged. Nuclear AHH was lnduced wlth dleldrln (150%), and the blndlng was decreased to 75%, whereaa the mlcrosomal AHH was at control Ievei. The lncreaslng effect of mlcrosomal AHH lnductlon as weil as the decreaslng effect of nuclear AHH lnductlon on the blndlng was shown clearly when the data of the Individual rata were uaed to solve the equatlon Binding = e•(mlcroeomal AHH) + b•(nuclear AHH) + c Multiple linear regresslon analysls wlth the data from 10 anlmala reaulted ln positive valuea for a and c, a negative value for b, and a good multiple correlatlon coefflclent of r = 0.974. Pretreatment wlth 3-methylcholanthrene ln· duced mlcrosomal AHH to 380% of control and nuclear AHH to 590% and lncreased the blndlng' to 175,.-o. The blndlng was hlgher than predlcted by the formula found, probably because the lncreaslng lnfluence of lnduced mlcrosomal AHH overahadowed the decreaslng effect of the nuclear AHH. The study ahows clearly that the blndlng of a forelgn compound to DNA in viWJ Ia dependent not only on mlcrosomal enzyme actlvltles but also on nuclear actlvltles even lf the latter are conslderably lower than thoae of mlcrosomes.