A crucial role for profilin–actin in the intracellular motility of Listeria monocytogenes

We have examined the effect of covalently crosslinked profilin–actin (PxA), which closely matches the biochemical properties of ordinary profilin–actin and interferes with actin polymerization in vitro and in vivo, on Listeria monocytogenes motility. PxA caused a marked reduction in bacterial motility, which was accompanied by the detachment of bacterial tails. The effect of PxA was dependent on its binding to proline-rich sequences, as shown by the inability of P(H133S)xA, which cannot interact with such sequences, to impair Listeria motility. PxA did not alter the motility of a Listeria mutant that is unable to recruit Ena (Enabled)/VASP (vasodilator-stimulated phosphoprotein) proteins and profilin to its surface. Finally, PxA did not block the initiation of actin-tail formation, indicating that profilin–actin is only required for the elongation of actin filaments at the bacterial surface. Our findings provide further evidence that profilin–actin is important for actin-based processes, and show that it has a key function in Listeria motility

Communication and Trust in the Care Provided to a Dying Parent: A Nationwide Study of Cancer-Bereaved Youths.

PURPOSETo assess children's trust in the care provided to a dying parent during the final week of life in relation to end-of-life medical information about disease, treatment, and death. METHODSThis nationwide population-based survey included 622 (73%) of 851 youths who, 6 to 9 years earlier, at age 13 to 16 years, lost a parent to cancer. We asked about the children's reception of end-of-life professional information and trust in the care provided. We also asked about depression and several potential risk factors of distrust in the care provided.ResultsA majority (82%) reported moderate/very much trust in the care provided. Compared with children who received end-of-life medical information before their loss, the risk of distrust in the care provided was higher in those who received no information (risk ratio [RR], 2.5; 95% CI, 1.5 to 4.1), in those who only received information afterward (RR, 3.2; 95% CI, 1.7 to 5.9), and in those who did not know or remember if end-of-life medical information was provided (RR, 1.7; 95% CI, 1.1 to 2.5). Those reporting distrust in the care provided had an RR of 2.3 (95% CI, 1.5 to 3.5) for depression. Furthermore, the risk of distrust in the care provided was higher among children reporting poor efforts to cure (RR, 5.1; 95% CI, 3.6 to 7.3), and/or a poor relationship with the surviving parent (RR, 2.9; 95% CI, 2.0 to 4.1). CONCLUSIONOur study suggests that children's trust in the care provided to a dying parent was highest when they received end-of-life medical information before their loss