首页> 外文期刊>Protoplasma: An International Journal of Cell Biology >RGD-containing peptides and cyclic AMP have antagonistic roles in the morphology of Mucor rouxii
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RGD-containing peptides and cyclic AMP have antagonistic roles in the morphology of Mucor rouxii

机译:含RGD的肽和环状AMP在鲁氏木霉的形态中具有拮抗作用

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摘要

The tripeptide Arg-Gly-Asp (RGD) (1 mM) as well as the polymer ProNectin F (20 nM) added to culture medium of the fungus Mucor rouxii (defined medium) produced a delay in the switch from iso-diametric growth to tip growth; at the time of germination the mother cell had a 4.6 times larger volume with 3.6 times more germ tubes per cell than control germinating sporangiospores. Disruption of the actin network with 2 mug of cytochalasin A per ml blocked the switch to tip growth; the effect was analogous to the one of 150 muM dibutyryl-cyclic AMP (cAMP), which we previously described to promote isodiametric growth via protein kinase A. 150 muM dibutyryl-cAMP antagonises partially the effect of 1 mM RGD; the cells still emit several germ tubes per mother cell but their number is smaller and the volume of the cell at germ tube emission is larger than with RGD alone. At higher concentrations the dibutyryl-cAMP overrides completely the effect of RGD. Our results suggest that M. rouxii has an RGD recognition system and demonstrate that RGD-containing peptides have a profound effect on the isotropic stage of growth and on the establishment of cell polarity and that cAMP analogues can override this effect. [References: 35]
机译:将三肽Arg-Gly-Asp(RGD)(1 mM)以及聚合物ProNectin F(20 nM)添加到真菌Mucor rouxii(定义的培养基)的培养基中会导致从等径生长到向等径生长的转换延迟小费增长;在发芽时,母细胞的体积比对照发芽的孢子孢子大4.6倍,每个细胞的胚管多3.6倍。每毫升2杯细胞松弛素A破坏肌动蛋白网络,阻止了向尖端生长的转变;这种效果类似于我们先前描述的通过蛋白激酶A促进等直径生长的150μM二丁酰环AMP(cAMP)中的一种。这些细胞仍会为每个母细胞发射几个胚管,但其数量要小得多,并且在胚管发射时的细胞体积要比单独使用RGD大。在较高浓度下,二丁酰-cAMP完全取代了RGD的作用。我们的结果表明,鲁氏甲烷八叠球菌具有RGD识别系统,并证明含RGD的肽对各向同性的生长阶段和细胞极性的建立具有深远的影响,而cAMP类似物可以取代这种作用。 [参考:35]

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