Amebae of Dictyostelium discoideum respond to an increasing temporal gradient of the chemoattractant cAMP with a reduced frequency of turning: evidence for a temporal mechanism in ameboid chemotaxis.

Amebae of Dictyostelium discoideum respond to an increasing temporal gradient of the chemoattractant cAMP with a reduced frequency of turning: evidence for a temporal mechanism in ameboid chemotaxis.
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盘基网柄菌的阿米巴对趋化剂 cAMP 的时间梯度增加做出反应,但转动频率降低:阿米巴趋化性时间机制的证据。

DOI:
10.1002/cm.970080103
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发表时间:
1987
影响因子:
--
通讯作者:
Soll,DR
Soll,DR
中科院分区:
--
文献类型:
--
作者:
Varnum-Finney,B;Edwards,KB;Voss,E;Soll,DR

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在一个聚集领域的Dictyosteelium discoideum,向外移动,非消散波的化学引诱物cAMP扫过每个阿米巴。在每个波的前面,阿米巴经历了增加的时间和正的cAMP空间梯度。在波的后面,阿米巴经历cAMP的时间梯度和负的空间梯度。采用灌注室,我们已经模仿了这些波的时间动态的空间梯度的情况下,并证明了侧伪足形成的频率和转向的频率显着影响的方向和动态的时间梯度。此外,由于阿米巴将以定向方式向上移动cAMP的浅的非脉动梯度,我们还模仿了阿米巴向上移动浅的空间梯度所产生的时间梯度增加。侧伪足形成频率和翻转频率降低。总之,这些结果表明,ameprazole可以评估的方向的时间梯度的化学引诱物的空间梯度的情况下,并相应地改变伪足延伸和转动的频率。虽然这些结果不排除参与评估的空间梯度的空间机制,他们强烈建议,时间动态的cAMP波或时间梯度产生的阿米巴移动通过空间梯度可能发挥了重要作用的趋化性。
In an aggregation territory ofDictyostelium discoideum, outwardly moving, nondissipating waves of the chemoattractant cAMP sweep across each ameba. At the front of each wave, an ameba experiences an increasing temporal and a positive spatial gradient of cAMP. At the back of a wave, an ameba experiences a decreasing temporal and a negative spatial gradient of cAMP. Employing a perfusion chamber, we have mimicked the temporal dynamics of these waves in the absence of a spatial gradient and demonstrated that the frequency of lateral pseudopod formation and the frequency of turning are dramatically affected by the direction and dynamics of the temporal gradient. In addition, since an ameba will move in a directed fashion up a shallow, nonpulsatile gradient of cAMP, we also mimicked the increasing temporal gradient generated by an ameba moving up a shallow spatial gradient. The frequency of lateral pseudopod formation and the frequency of turning were depressed. Together, these results demonstrate that amebae can assess the direction of a temporal gradient of chemoattractant in the absence of a spatial gradient and alter both the frequency of pseudopod extension and turning, accordingly. Although these results do not rule out the involvement of a spatial mechanism in assessing a spatial gradient, they strongly suggest that the temporal dynamics of a cAMP wave or the temporal gradient generated by an ameba moving through a spatial gradient may play a major role in chemotaxis.
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