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排序方式: 共有1131条查询结果,搜索用时 15 毫秒
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Mikołaj Świerczyński Agata Szymaszkiewicz Jakub Fichna Marta Zielińska 《生物化学与生物物理学报:癌评论》2021,1875(1):188460
Colorectal cancer (CRC) is one of the most common cause of death among neoplasms around the world. The environmental factors, like diet and obesity, are crucial in CRC pathogenesis by creating cancer-favorable microenvironment and hormonal changes. Adiponectin, the adipose tissue-specific hormone, is generally considered to negatively correlate with CRC development. The interleukin 6 (IL-6) is one of the most important pro-inflammatory cytokine connected with CRC, which is strongly inflammation-associated. The opioids are variable group substantially correlated with cancers - the endogenous opioids affect immune system and cell cycle including proliferation and cell death whereas exogenous opioids are leading clinically used analgesics in terminal cancer patients. In this review we discuss the involvement of adiponectin, IL-6 and opioids in CRC pathogenesis, their link with obesity, possible cross-talk and potential novel therapeutic approach in CRC treatment. 相似文献
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The neuroendocrine system of insects, including the presence of the main neuroactive compounds, and their role in ontogenesis are probably best understood of all the arthropods. Development, metamorphosis, the maturation of the gonads, vitellogenesis and egg production are regulated by hormones (juvenile hormones, ecdysteroids) and neuropeptides. However, knowledge about their presence and functions in spiders is fragmentary. In this paper, we present a summary of the current data about the juvenile hormones, ecdysteroids and neuropeptides in selected groups of arthropods, with particular emphasis on spiders. This is the first article that takes into account the occurrence, action and role of hormones and neuropeptides in spiders. In addition, the suggestions for possible ways to study these compounds in Araneomorphae spiders are unique and cannot be found in the arachnological literature. 相似文献
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Alessandro Castorina Soraya Scuderi Agata Grazia D’Amico Filippo Drago Velia D’Agata 《Experimental cell research》2014
PACAP and its cognate peptide VIP participate in various biological functions, including myelin maturation and synthesis. However, defining whether these peptides affect peripheral expression of myelin proteins still remains unanswered. To address this issue, we assessed whether PACAP or VIP contribute to regulate the expression of three myelin proteins (MAG, MBP and MPZ, respectively) using the rat schwannoma cell line (RT4-P6D2T), a well-established model to study myelin gene expression. In addition, we endeavored to partly unravel the underlying molecular mechanisms involved. Expression of myelin-specific proteins was assessed in cells grown either in normal serum (10% FBS) or serum starved and treated with or without 100 nM PACAP or VIP. Furthermore, through pharmacological approach using the PACAP/VIP receptor antagonist (PACAP6-38) or specific pathway (MAPK or PI3K) inhibitors we defined the relative contribution of receptors and/or signaling pathways on the expression of myelin proteins. Our data show that serum starvation (24 h) significantly increased both MAG, MBP and MPZ expression. Concurrently, we observed increased expression of endogenous PACAP and related receptors. Treatment with PACAP or VIP further exacerbated starvation-induced expression of myelin markers, suggesting that serum withdrawal might sensitize cells to peptide activity. Stimulation with either peptides increased phosphorylation of Akt at Ser473 residue but had no effect on phosphorylated Erk-1/2. PACAP6-38 (10 μM) impeded starvation- or peptide-induced expression of myelin markers. Similar effects were obtained after pretreatment with the PI3K inhibitor (wortmannin, 10 μM) but not the MAPKK inhibitor (PD98059, 50 μM). Together, the present finding corroborate the hypothesis that PACAP and VIP might contribute to the myelinating process preferentially via the canonical PI3K/Akt signaling pathway, providing the basis for future studies on the role of these peptides in demyelinating diseases. 相似文献
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Agata Jêdrzejuk 《Journal of Plant Growth Regulation》2005,24(2):83-92
Forcing makes possible to induce plant flowering independently of the season. In lilac, high temperature is the factor that
breaks deep dormancy. The deepest dormancy occurs between the end of October and the end of December. Depending on the depth
of dormancy, the starting temperatures required for forcing are 37°C in November, 31°C in December, and 25°C in January–March.
Under natural conditions, the temperature inducing the inflorescence bud breaking is 6°C, whereas 9°C and 13°C or more allow
inflorescence elongation and flowering, respectively (Kronenberg, 1994). In the present work, the effect of high temperature at the beginning of the forcing cycle on the structure of developing
pollen grains of common lilac was investigated. Pollen grains from the outdoor-grown (control) shrubs showed no signs of degeneration.
They were spherical, three-colpate to colporoidate, and bicellular, and contained large numbers of lipid bodies. High temperatures
at the early forcing cycle (November) resulted in the degeneration of most microspores. The first signs of degeneration (cytoplasm
plasmolysis) were observed at the tetrad stage and in mature anthers; the microspores consisted only of the outer and inner
sporopolenin layers. 相似文献
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Annarita Poli Vincenzo Schiano Moriello Enrico Esposito Licia Lama Agata Gambacorta Barbara Nicolaus 《Biotechnology letters》2005,26(21):1635-1638
A haloalkalophilic Halomonas strain CRSS, isolated from salt sediments in Antarctica, produced exocellular polysaccharides (EPS) up to 2.9gg-1 dry cells. Acetate was the most efficient carbon source for EPS production. The composition of media strongly affected the nature of the polymers; a mannan and a xylo-mannan, were obtained when cells were grown on complex media. Acetate was the most efficient carbon source for EPS production and in presence of this substrate, a new polysaccharide, a fructo-glucan, was produced. The EPS fraction was composed by glucose, fructose, glucosamine and galactosamine in relative proportions of 1:0.7:0.3:trace.Revisions requested; Revisions received 6 September 2004 相似文献
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Edyta Kostrzewa-Susow Jadwiga Dmochowska-Gadysz Agata Biaoska Zbigniew Ciunik Waldemar Rymowicz 《Journal of Molecular Catalysis .B, Enzymatic》2006,39(1-4):18-23
Flavanone (1) and 6-hydroxyflavanone (2) were subjected to transformation by means of Aspergillus niger strains (one wild and three UV mutants). For both substrates the biotransformation resulted in reduction of the carbonyl group (products 5 and 7) and dehydrogenation at C-2 and C-3 (3 and 8). Additionally, for flavanone (1) reduction of C-4 together with hydroxylation at C-7 (6) and dehydrogenation at C-2, C-3 along with hydroxylation at C-3 (4) were observed. 相似文献