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- ArticleFancsalszky L, Monostori E, Farkas Z, Pourkarimi E, Masoudi N, Hargitai B, Bosnar MH, Deželjin M, Zsákai A, Vellai T, Mehta A, Takács-Vellai K.PLoS One. 2014;9(3):e92687.Abnormal regulation of cell migration and altered rearrangement of cytoskeleton are characteristic of metastatic cells. The first described suppressor of metastatic processes is NM23-H1, which displays NDPK (nucleoside-diphosphate kinase) activity. To better understand the role of nm23 genes in cell migration, we investigated the function of NDK-1, the sole Caenorhabditis elegans homolog of group I NDPKs in distal tip cell (DTC) migration. Dorsal phase of DTC migration is regulated by integrin mediated signaling. We find that ndk-1 loss of function mutants show defects in this phase. Epistasis analysis using mutants of the α-integrin ina-1 and the downstream functioning motility-promoting signaling module (referred to as CED-10 pathway) placed NDK-1 downstream of CED-10/Rac. As DTC migration and engulfment of apoptotic corpses are analogous processes, both partially regulated by the CED-10 pathway, we investigated defects of apoptosis in ndk-1 mutants. Embryos and germ cells defective for NDK-1 showed an accumulation of apoptotic cell corpses. Furthermore, NDK-1::GFP is expressed in gonadal sheath cells, specialized cells for engulfment and clearence of apoptotic corpses in germ line, which indicates a role for NDK-1 in apoptotic corpse removal. In addition to the CED-10 pathway, engulfment in the worm is also mediated by the CED-1 pathway. abl-1/Abl and abi-1/Abi, which function in parallel to both CED-10/CED-1 pathways, also regulate engulfment and DTC migration. ndk-1(-);abi-1(-) double mutant embryos display an additive phenotype (e. g. enhanced number of apoptotic corpses) which suggests that ndk-1 acts in parallel to abi-1. Corpse number in ndk-1(-);ced-10(-) double mutants, however, is similar to ced-10(-) single mutants, suggesting that ndk-1 acts downstream of ced-10 during engulfment. In addition, NDK-1 shows a genetic interaction with DYN-1/dynamin, a downstream component of the CED-1 pathway. In summary, we propose that NDK-1/NDPK might represent a converging point of CED-10 and CED-1 pathways in the process of cytoskeleton rearrangement.
- BookHaider Warraich, M.D.Summary: "There is no more universal truth in life than death. No matter who you are, it is certain that one day you will die, but the mechanics and understanding of that experience will differ greatly in today's modern age. Dr. Haider Warraich is a young and brilliant new voice in the conversation about death and dying started by Dr. Sherwin Nuland's classic How We Die: Reflections on Life's Final Chapter, and Atul Gawande's recent sensation, Being Mortal: Medicine and What Matters in the End. Dr. Warraich takes a broader look at how we die today, from the cellular level up to the very definition of death itself. The most basic aspects of dying--the whys, wheres, whens, and hows--are almost nothing like what they were mere decades ago. Beyond its ecology, epidemiology, and economics, the very ethos of death has changed. Modern Death, Dr. Warraich's debut book, will explore the rituals and language of dying that have developed in the last century, and how modern technology has not only changed the hows, whens, and wheres of death, but the what of death. Delving into the vast body of research on the evolving nature of death, Modern Death will provide readers with an enriched understanding of how death differs from the past, what our ancestors got right, and how trends and events have transformed this most final of human experiences"-- Provided by publisher.
Contents:
How Cells Die
How Life (and Death) Were Prolonged
Where Death Lives Now
How We Learned Not to Resuscitate
How Death Was Redefined
When the Heart Stops
When Death Transcends
When Guardians Are Burdened
How Death Is Negotiated
Why Families Fall
When Death Is Desired
When the Plug is Pulled
#WhenDeathIsShared.