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Five reasons why COVID herd immunity is probably impossible
Even with vaccination efforts in full force, the theoretical threshold for vanquishing COVID-19 looks to be out of reach.
Even with vaccination efforts in full force, the theoretical threshold for vanquishing COVID-19 looks to be out of reach.
Journal Article
The false promise of herd immunity for COVID-19
Why proposals to largely let the virus run its course — embraced by Donald Trump’s administration and others — could bring “untold death and suffering”.
Why proposals to largely let the virus run its course — embraced by Donald Trump’s administration and others — could bring “untold death and suffering”.
Journal Article
And then there were none
A killer stalks ten strangers on an isolated island off the Devon coast, in a suspenseful story of murder and retribution set to a sinister nursery rhyme.
Book
Cellular neuroadaptations to chronic opioids: tolerance, withdrawal and addiction
A large range of neuroadaptations develop in response to chronic opioid exposure and these are thought to be more or less critical for expression of the major features of opioid addiction: tolerance, withdrawal and processes that may contribute to compulsive use and relapse. This review considers these adaptations at different levels of organization in the nervous system including tolerance at the μ‐opioid receptor itself, cellular tolerance and withdrawal in opioid‐sensitive neurons, systems tolerance and withdrawal in opioid‐sensitive nerve networks, as well as synaptic plasticity in opioid sensitive nerve networks. Receptor tolerance appears to involve enhancement of mechanisms of receptor regulation, including desensitization and internalization. Adaptations causing cellular tolerance are more complex but several important processes have been identified including upregulation of cAMP/PKA and cAMP response element‐binding signalling and perhaps the mitogen activated PK cascades in opioid sensitive neurons that might not only influence tolerance and withdrawal but also synaptic plasticity during cycles of intoxication and withdrawal. The potential complexity of network, or systems adaptations that interact with opioid‐sensitive neurons is great but some candidate neuropeptide systems that interact with μ‐opioid sensitive neurons may play a role in tolerance and withdrawal, as might activation of glial signalling. Implication of synaptic forms of learning such as long term potentiation and long term depression in opioid addiction is still in its infancy but this ultimately has the potential to identify specific synapses that contribute to compulsive use and relapse. British Journal of Pharmacology (2008) 154, 384–396; doi:10.1038/bjp.2008.100; published online 14 April 2008
Journal Article
