light response Dotaz Zobrazit nápovědu
- MeSH
- krysa rodu rattus MeSH
- porfyriny sekrece MeSH
- slzné ústrojí MeSH
- světlo MeSH
- zvířata MeSH
- Check Tag
- krysa rodu rattus MeSH
- zvířata MeSH
Autoři předkládají případ nemocného s mnohočetným myelomem s primárně dobrou odpovědí na indukční chemoterapii a vysokodávkovanou terapii s podporou autologních periferních kmenových buněk. Následná časná abruptivní progrese onemocnění byla charakterizována klonem morfologicky dediferencovaných myelomových buněk se ztrátou schopnosti syntézy kompletní molekuly monoklonálního imunoglobulinu a výraznou nadprodukcí volných lehkých řetězců kappa. Cytogenetické vyšetření prokázalo vývoj karyotypu s přítomností sekundárních, prognosticky nepříznivých cytogenetických změn – translokace t(8;14)(q24;q32) a zvýšený počet kopií oblasti 1q21. Progrese myelomu byla spojena s výraznou rezistencí na kombinovanou chemoimunoterapii.
The authors present the case study of a multiple myeloma patient with a good primary response to induction chemotherapy and high-dose treatment supported by autologous peripheral stem cells. The following early and abrupt progression of the disease was characterised by a clone of the morphologically dedifferentiated population of tumorous cells including the loss of the ability to synthesize complete molecules of the monoclonal immunoglobulin and the overproduction of kappa free light chains. A cytogenetic examination revealed the development of a karyotype and the presence of secondary cytogenetic modifications with an unfavourable prognosis – translocation t(8;14) (q24;q32) and increased number of copies of the 1q21 area. The myeloma progression was associated with the subsequent resistance to a state-of-the-art combined therapy.
- MeSH
- cytogenetické vyšetření metody využití MeSH
- cytogenetika MeSH
- dospělí MeSH
- financování organizované MeSH
- lehké řetězce imunoglobulinů krev MeSH
- lidé MeSH
- mnohočetný myelom diagnóza genetika komplikace MeSH
- progrese nemoci MeSH
- translokace genetická MeSH
- Check Tag
- dospělí MeSH
- lidé MeSH
- mužské pohlaví MeSH
- MeSH
- dítě MeSH
- flicker-fusion test MeSH
- kojenec MeSH
- lidé MeSH
- mozek fyziologie patofyziologie MeSH
- nemoci centrálního nervového systému patofyziologie MeSH
- novorozenec nedonošený MeSH
- novorozenec MeSH
- předškolní dítě MeSH
- světlo MeSH
- Check Tag
- dítě MeSH
- kojenec MeSH
- lidé MeSH
- novorozenec MeSH
- předškolní dítě MeSH
Light plays an essential role in photosynthesis; however, its excess can cause damage to cellular components. Photosynthetic organisms thus developed a set of photoprotective mechanisms (e.g., non-photochemical quenching, photoinhibition) that can be studied by a classic biochemical and biophysical methods in cell suspension. Here, we combined these bulk methods with single-cell identification of microdomains in thylakoid membrane during high-light (HL) stress. We used Synechocystis sp. PCC 6803 cells with YFP tagged photosystem I. The single-cell data pointed to a three-phase response of cells to acute HL stress. We defined: (1) fast response phase (0-30 min), (2) intermediate phase (30-120 min), and (3) slow acclimation phase (120-360 min). During the first phase, cyanobacterial cells activated photoprotective mechanisms such as photoinhibition and non-photochemical quenching. Later on (during the second phase), we temporarily observed functional decoupling of phycobilisomes and sustained monomerization of photosystem II dimer. Simultaneously, cells also initiated accumulation of carotenoids, especially ɣ-carotene, the main precursor of all carotenoids. In the last phase, in addition to ɣ-carotene, we also observed accumulation of myxoxanthophyll and more even spatial distribution of photosystems and phycobilisomes between microdomains. We suggest that the overall carotenoid increase during HL stress could be involved either in the direct photoprotection (e.g., in ROS scavenging) and/or could play an additional role in maintaining optimal distribution of photosystems in thylakoid membrane to attain efficient photoprotection.
- MeSH
- bakteriální proteiny genetika metabolismus MeSH
- fotosystém I (proteinový komplex) genetika metabolismus MeSH
- fotosystém II (proteinový komplex) genetika metabolismus MeSH
- karotenoidy metabolismus MeSH
- světlo * MeSH
- Synechocystis metabolismus účinky záření MeSH
- tylakoidy metabolismus účinky záření MeSH
- velikost buňky účinky záření MeSH
- Publikační typ
- časopisecké články MeSH
- práce podpořená grantem MeSH
Light spectra significantly influence plant metabolism, growth and development. Here, we review the effects of monochromatic blue, red and green light compared to those of multispectral light sources on the morpho-anatomical, photosynthetic and molecular traits of herbaceous plants. Emphasis is given to the effect of light spectra on the accumulation of secondary metabolites, which are important bioactive phytochemicals that determine the nutritional quality of vegetables. Overall, blue light may promote the accumulation of phenylpropanoid-based compounds without substantially affecting plant morpho-anatomical traits compared to the effects of white light. Red light, conversely, strongly alters plant morphology and physiology compared to that under white light without showing a consistent positive effect on secondary metabolism. Due to species-specific effects and the small shifts in the spectral band within the same color that can substantially affect plant growth and metabolism, it is conceivable that monochromatic light significantly affects not only plant photosynthetic performance but also the "quality" of plants by modulating the biosynthesis of photoprotective compounds.
The effect of temperature, light and nutrient composition on morphological traits was determined in seven nostocacean cyanobacteria (Anabaena planctonica, A. sphaerica var. conoidea, A. spiroides, Aphanizomenon gracile, Nostoc sp., Scytonema sp., and Tolypothrix sp.). Their morphological variability was high but only some of the features showed changes reflecting varied growth conditions. The frequency of heterocyst occurrence decreased with increasing nitrogen concentration. Within the range studied, the effect of temperature on heterocyst frequency of Tolypothrix sp. and planktonic Anabaena strains could be fitted by a normal curve with a clear optimum while linear correlation was found in Aphanizomenon gracile. T-and S-type branching was observed in both Scytonema sp. and Tolypothrix sp. strains. T-type branching was found to be markedly dependent on nitrogen concentration. The abundance of necridic cells of Tolypothrix sp. increased linearly with temperature and light intensity. Regularity of trichome coiling of A. spiroides depended on culture medium, suggesting that nutrient composition may be the main controlling factor. In contrast, the effect of the experimental conditions on the dimensions of vegetative cells and heterocysts was weak. Their variability was markedly higher within each experimental treatment than between treatments.
- MeSH
- lidé MeSH
- mnohočetný myelom farmakoterapie MeSH
- vztah mezi dávkou a účinkem léčiva MeSH
- Check Tag
- lidé MeSH
