* Cyclic AMP regulates the migration and invasion potential of human pancreatic cancer cells.
- Aggressive dissemination and metastasis of pancreatic ductal adenocarcinoma (PDAC) results in poor prognosis and marked lethality. Rho monomeric G protein levels are increased in pancreatic cancer tissue. As the mechanisms underlying PDAC malignancy are little understood, we investigated the role for cAMP in regulating monomeric G protein regulated invasion and migration of pancreatic cancer cells. Treatment of PDAC cells with cAMP elevating agents that activate adenylyl cyclases, forskolin, protein kinase A (PKA), 6-Bnz-cAMP, or the cyclic nucleotide phosphodiesterase inhibitor cilostamide significantly decreased migration and Matrigel invasion of PDAC cell lines. Inhibition was dose-dependent and not significantly different between forskolin or cilostamide treatment. cAMP elevating drugs not only blocked basal migration, but similarly abrogated transforming-growth factor-β-directed PDAC cell migration and invasion. The inhibitory effects of cAMP were prevented by the pharmacological blockade of PKA. Drugs that increase cellular cAMP levels decreased levels of active RhoA or RhoC, with a concomitant increase in phosphorylated RhoA. Diminished Rho signaling was correlated with the appearance of thickened cortical actin bands along the perimeter of non-motile forskolin or cilostamide-treated cells. Decreased migration did not reflect alterations in cell growth or programmed cell death. Collectively these data support the notion that increased levels of cAMP specifically hinder PDAC cell motility through F-actin remodeling.
=>大きくなる, を増す, 増大させる, 強まる, 増加, 増える, 増やす
Overview of noun increase
The noun increase has 5 senses (first 5 from tagged texts)
1. (49) addition, increase, gain -- (a quantity that is added; "there was an addition to property
taxes this year"; "they recorded the cattle's gain in weight over a period of weeks")
2. (21) increase -- (a change resulting in an increase; "the increase is scheduled for next month")
3. (7) increase, increment, growth -- (a process of becoming larger or longer or more numerous or
more important; "the increase in unemployment"; "the growth of population")
4. (3) increase, increment -- (the amount by which something increases; "they proposed an increase
of 15 percent in the fare")
5. (3) increase, step-up -- (the act of increasing something; "he gave me an increase in salary")
Overview of verb increase
The verb increase has 2 senses (first 2 from tagged texts)
1. (86) increase -- (become bigger or greater in amount; "The amount of work increased")
2. (61) increase -- (make bigger or more; "The boss finally increased her salary"; "The university
increased the number of students it admitted")
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