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1

What shapes our knowledge of the relationship between water deficiency stress and plant volatiles?

100%
Szabo K., Zubay P., Nemeth-Zamborine E.
Acta Physiologiae Plantarum
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2020
|
tom 42
|
nr 08
2

Effects of haematophagous mites on nestling house sparrows [Passer domesticus]

100%
Szabo K., Szalmas A., Liker A., Barta Z.
Acta Parasitologica
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2002
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tom 47
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nr 4
Haematophagous mites are frequently found on nestling house sparrows (Passer domesticus), but their effects are poorly known. In this study we investigated whether natural levels of infection by two mite species Pellonyssus reedi and Ornithonyssus sylviarum have any fitness consequences on their hosts, including some physiological indices of chick health, body condition and fledging success. Among the haematological variables, thrombocytes and heterophils, but not lymphocytes and eosinophil granulocytes showed positive correlations with mite loads. There was also a significant decrease in the haematocrit values of the nestling sparrows with increasing mite intensity. We found no significant effect of ectoparasites on short- term indices of nestling fitness, such as body mass or fledging success. These results suggest that the blood-feeding mites of the studied house sparrow population mainly affected the haematological parameters of their hosts: They generated a non-specific immune response, with inflammatory processes and anaemia. On the other hand, parasite infestation seemingly has only weak influence on feather and skeletal growth of nestling sparrows, and no effect on fledging success and body mass.
3
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Variability of phenolic compounds of four aromatic Lamiaceae species in consequence of different water supply

76%
Nemeth-Zambori E., Szabo K., Rajhart P., Inotai K., Seidler-Lozykowska K., Radacsi P.
Acta Scientiarum Polonorum. Hortorum Cultus
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2017
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tom 16
|
nr 4
The reactions of lemon balm, marjoram, peppermint, thyme were investigated and compared in a pot experiment, adjusting 70% and 40% of soil water capacity (SWC). Biomass, total phenolic content (TPC), rosmarinic acid content (RA) and antioxidant capacity (FRAP, DPPH) of both the shoots and roots were measured. As an universal phenomenon the water stress (40% SWC) decreased the total biomass production of all species drastically. The highest increase was observed in the shoot mass of peppermint and lemon balm (decreased from 52.6 g·plant–1 to 11.3 g·plant–1 and from 236.8 g·plant–1 to 58 g·plant–1, respectively). The reaction of marjoram was much more moderate. The accumulation level of TPC was accelerated in the aboveground parts of the studied species, universally. The reactions in the roots were less characteristic. The largest increase of TPC was measured in the shoots of lemon balm (from 359.015 mg GAE· g–1 d.w. up to 412.44 GAE·g–1 d.w.). The reaction of marjoram was the less characteristic in this respect, as well. The parallel changes of biomass and TPC level might allow the total phenolic content to function as an adequate marker in predicting the lack of appropriate water supply. RA content showed species characteristics. Thyme, marjoram and peppermint reacted by a significant elevation (by 23–127%) of the RA content to the lack of water. The highest proportions were accumulated in shoots of the stressed thyme plants (3.45% d.w.).
4

The neuroprotective effects of urocortin 2 in bilateral common carotid occlusion induced retinal degeneration

64%
Szabadfi K., Atlasz T., Reglodi D., Kiss P., Szabo K., Danyadi B., Tamas A., Fekete E., Zorrilla E., Gabriel R.
Acta Neurobiologiae Experimentalis
|
2009
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tom 69
|
nr 3
Urocortin 2 (Ucn 2) is a CRF paralog that preferentially activates CRF2 receptors. Little is known regarding potential retinoprotective effects of Ucns despite the known presence of CRF family peptides and their receptors in retina. We investigated the effects of intravitreal Ucn 2 administration on ischemia-induced retinal degeneration (BCCAO). Two-month-old rats were subjected to BCCAO and their retinas were processed histologically after two weeks survival to determine the density of viable cells in the ganglionic cell layer and the thickness of all retinal layers. Immunohistological analysis of PKC-, calretinin-immunoreactivity was also performed. In BCCAO reduced retina thickness by approximately 60% as compared to sham-operated animals. Intraocular Ucn 2 treatment led to a nearly intact appearance of the retinal layers, and the thickness of all layers was signifi cantly increased by 40% compared to ischemic vehicle-treated subjects. Ucn 2 treatment also increased the number of cells by 55% in the ganglionic cell layer as compared to those from carotid-occluded retinas of vehicle-treated subjects. Ucn 2 also reversed the alterations found in the pattern of immunocytochemical markers, such as calretinin and PKC. These fi ndings suggest that intraocular Ucn 2 treatment may protect against ischemia-induced retinal degeneration, results with potential therapeutic implications for ophthalmic diseases. Support: OTKA: K72592; F67830; 78480; T061766; Richter.
5

The neuroprotective effects of PACAP in several models of neurodegeneration in the rat retina

64%
Atlasz T., Szabadfi K., Reglodi D., Kiss P., Gaal V., Tamas A., Toth G., Szabo K., Molnar A., Gabriel L.
Acta Neurobiologiae Experimentalis
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2009
|
tom 69
|
nr 3
Pituitary adenylate cyclase activating polypeptide (PACAP) is a neurotrophic and neuroprotective peptide that has been shown to exert protective effects in different neuronal injuries, models of neurodegenerative diseases and cerebral ischemia. PACAP and its receptors are present in the retina. PACAP is neuroprotective in several models of retinal degeneration in vitro and in vivo. In the present study we summarize the protective effects found with intravitreal PACAP treatment in the following models of retinal degeneration in rats: (1) toxic injury induced by monosodium glutamate (MSG) treatment; (2) ischemic injury (BCCAO) and (3) degeneration induced by different kind of UV-A light. MSG leads to the severe degeneration of the inner retinal layers. BCCAO cause degeneration in all retinal layers. UV-A exposure leads to a severe damage of the outer layers of the retina. In all cases, intravitreal PACAP injection (100 pmol) was administered into one (right) eye, while the other eye (left) received saline treatment, serving as control retinas. Histological and immunocytochemical analysis of the retinas showed that PACAP treatment signifi cantly ameliorated the damaging effects of all treatments. These results provide the basis for future clinical application of PACAP treatment in retinal degeneration. Support: OTKA: K72592; F67830; 78480; T061766; Gedeon Richter Ltd.
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