At the third SENS conference, Dr. Samit Adhya of the Indian Institute of Chemical Biology presented a proof-of-principle for the use of an RNA import complex adapted from the parasite Leishmania to import arbitrary antisense RNA strands into mammalian mitochondria, reducing levels of a target protein by RNA interference. In a new study, Adhya's group reports the successful use of the same technique to deliver mRNA sequences corresponding to proteins of the electron transfer chain, rescuing mitochondrial function in cells with mutations or deletions in those genes.
Dr. Doris Taylor, the researcher whose team successfully engineered a live, beating rat heart via the technique of decellularisation and reseeding, has announced progress towards repeating the process with human tissue. Press reports based on Dr. Taylor's presentation at the American College of Cardiology's 60th Annual Scientific Session indicate that the hearts are growing well and are expected to begin beating within the next few weeks.
Much of the distraction in the literature of biogerontology, and an even higher ratio of studies cited and promoted in the popular media and the dietary supplement industry, derives from methodologically-poor lifespan studies in mice (or occasionally rats). In these studies, an increase in mean or maximal lifespan is reported, relative to short-lived controls, and claimed to be informative about the universal, degenerative aging process and the prospects for extending healthy life in humans living in the developed world.
I'm delighted to be able to share with you our research report, prepared for the first 10 months of 2010, by Tanya Jones (our Director of Research Operations), working with our researchers and my CSO Team.
The free radical theory of aging suggests that reactive oxygen species (ROS) and similar chemicals are responsible for a large part, or perhaps all, of the molecular and cellular damage that accumulates in aging bodies. However, more detailed analysis has revealed that some free radicals have essential signalling functions within the cell. These functions are likely to explain some of the failure of antioxidant therapy to extend lifespans in model organisms.
Two recent publications clearly refute the principle arguments in favour of a distinction between "normal" cognitive aging, and pathological conditions such as Alzheimer's disease. Instead, it is increasingly apparent that the "normal" cognitive decline observed in all elderly and some middle-aged individuals is simply an earlier stage of the frank neuropathology observed in neurodegenerative disease. We emphasise that treating such conditions at this earlier, pre-clinical stage is likely to be more effective, as well as being more humane.
The degenerative aging of the immune system is responsible for an enormous burden of disease and disability, from the pain of recurrent Herpes zoster and postherpetic neuralgia, to elevated rates of chronic urinary tract infections, to complications in wounds, pressure sores, ulcers, and surgical incisions. Most prominently, it underlies the meteoric rise in mortality from respiratory infections with age: influenza, pneumonia, and septicemia rise from being negligible causes of death in healthy middle-aged adults in the USA, to emerge amongst the top 10 causes of death in adults over the age of 55, with mortality rates climbing with each successive year of aging.
Zinc finger nucleases (ZFNs) are engineered DNA-binding proteins with remarkable, highly programmable sequence-specificity. However, their widespread use has been slowed by licensing issues and the technical difficulty of synthesising new variants. A new platform, CoDA (context-dependent assembly), promises to make these exceptionally useful tools available to a far greater number of researchers.
One of our priorities at the SENS Foundation Research Center has been to overcome the limitations of our ability to test potential A2E-degrading enzymes caused by a restricted supply of the target molecule (A2E). We have now successfully synthesized A2E, purifying it by flash chromatography and HPLC, and confirming it to be identical to that produced in Janet Sparrow's laboratory through different analytical tests.
Toward Full Pluripotency of Reprogrammed Cells -- And Cautionary Tale About Abandoning the 'Gold Standard'Posted by Michael Rae on December 09, 2010 | Chief Science Officer's Team
Induced pluripotent stem cells (iPSCs) are among the most exciting recent developments in biomedicine, overcoming immunological and ethical issues associated with the use of embryonic stem cells (ESCs). However, reasonable doubt remains regarding whether iPSCs do in fact have the full biological and therapeutic potential of ESCs. Work at the Harvard Stem Cell Institute recently produced the first "all-iPSC" live mice, a milestone on the road to establishing full equivalence between the two methods.
Resveratrol, a polyphenol famously found in wine, has previously been shown to extend lifespan in some naturally unhealthy rodent strains - but unfortunately does not show the same benefits in healthy, naturally long-lived mice. Meanwhile rapamycin, an immunosuppressant drug, has now become the first substance confirmed to at least moderately extend maximum lifespan in healthy mice.
The clearance of beta-amyloid (Abeta) and other protein aggregates by immunotherapy is a key rejuvenation biotechnology to restore youthful function to aging brains, especially those with Alzheimer's disease (AD) and other neurodegenerative disorders. Initial trials using anti-Abeta vaccines have demonstrated concomitant reductions in early-stage tau aggregates, but not in mature neurofibrillary tangles, suggesting that such vaccines would be optimally deployed much earlier in the disease process - or in combination with anti-tau vaccines.