Fytoterapie má nezastupitelnou roli v léčbě diabetes mellitus (DM) především pro svůj adjuvantní účinek, který může vést ke snížení spotřeby klasických farmak a oddálit nástup pozdních komplikací diabetu. Na trhu je dostupné velké množství fytoterapeutik, která jsou registrována jako léčiva nebo potravní doplňky. Cílem této práce je představit přehled vybraných rostlinných drog s prokázaným podpůrným terapeutickým účinkem se zaměřením na preklinické i klinické studie.
Phytotherapy has an irreplaceable role in the treatment of diabetes mellitus (DM), mainly because of its adjuvant effect, which can lead to a decrease in the consumption of classic drugs and delay the onset of late complications of diabetes. A large number of phytotherapeutics are available on the market and they are registered as pharmaceuticals or food supplements. The aim of this work is to present an overview of selected herbal drugs with proven supportive therapeutic effect, focusing on preclinical and clinical studies.
- MeSH
- diabetes mellitus * farmakoterapie MeSH
- fazol imunologie metabolismus účinky léků MeSH
- fytoterapie * metody trendy MeSH
- hypoglykemika * farmakologie terapeutické užití MeSH
- kořeny rostlin metabolismus účinky léků MeSH
- léčivé rostliny metabolismus účinky léků MeSH
- lidé MeSH
- rostlinné extrakty terapeutické užití MeSH
- šalvěj lékařská imunologie metabolismus účinky léků MeSH
- Trigonella imunologie metabolismus účinky léků MeSH
- Urtica dioica imunologie metabolismus účinky léků MeSH
- Vaccinium myrtillus imunologie metabolismus účinky léků MeSH
- ženšen imunologie metabolismus účinky léků MeSH
- Check Tag
- lidé MeSH
A new method of the chlorophyll (Chl) a fluorescence quenching analysis is described, which allows the calculation of values of (at least) three components of the non-photochemical quenching of the variable Chl a fluorescence (q (N)) using a non-linear regression of a multi-exponential function within experimental data. Formulae for coefficients of the "energy"-dependent (DeltapH-dependent) quenching (q (E)), the state-transition quenching (q (T)) and the photo/inhibitory quenching (q (I)) of Chl a fluorescence were found on the basis of three assumptions: (i) the dark relaxation kinetics of q (N), as well as of all its components, is of an exponential nature, (ii) the superposition principle is valid for individual Chl a fluorescence quenching processes and (iii) the same reference fluorescence level (namely the maximum variable Chl a fluorescence yield in the dark-adapted state, F (V)) is used to define both q (N) and its components. All definitions as well as the algorithms for analytical recognition of the q (N) components are theoretically clarified and experimentally tested. The described theory results in a rather simple equation allowing to compute values for all q (N) components (q (E), q (T), q (I)) as well as the half-times of relaxation (tau(1/2)) of corresponding quenching processes. It is demonstrated that under the above assumptions it holds: q (N) = q (E) + q (T) + q (I). The theoretically derived equations are tested, and the results obtained are discussed for non-stressed and stressed photosynthetically active samples. Semi-empirical formulae for a fast estimation of values of the q (N) components from experimental data are also given.
The root nodules of Phaseolus mungo (a herbaceous leguminous pulse) contained a high amount of 3-indolylacetic acid (IAA). A tryptophan pool present in the nodule might play the role of precursor for IAA production. From the root nodule a Rhizobium sp. was isolated. The symbiont produced a large amount of IAA (142 microg/mL) from L-tryptophan-supplemented basal medium. The production of IAA by the symbiont was much increased over the control when a L-tryptophan (2 mg/mL) supplemented C-free mineral medium was enriched with mannitol (1 %), L-asparagine (0.3 %) and thiamine hydrochloride (1 microg/mL). The possible role of the rhizobial production of IAA on the rhizobia-legume symbiosis is discussed.
Reactive oxygen species are known to increase in plant senescence. We investigated the participation of antioxidative enzymes in initiation of cotyledon senescence. Senescence of bean (Phaseolus vulgaris L.) cotyledons was modulated by UV C irradiation and by the decapitation of plant apices. Senescence was accompanied by a decrease of protein content and by a decrease of photochemical efficiency. A drop in activity of antioxidative enzymes preceded the onset of senescence in control plants. In cotyledons with prolonged life span, the decrease of antioxidant activities and the markers of senescence onset appeared at a similar age as in controls. Thus we presumed that the period from senescence initiation to cotyledon abscission was extended. On the other hand, in UV C irradiated plants we did not observe actual senescence initiation, and antioxidant enzymes although elevated, did not effectively play their role. The decrease of antioxidant enzymes activity and the markers of senescence appeared at a similar age both in control and in decapitated (D) plants, so we can presume that we prolonged mainly the period from senescence onset to cotyledon abscission in D plants. In UV C irradiated plants the antioxidative enzymes were probably destroyed before the process of senescence could begin. 2005 John Wiley & Sons, Ltd.
