Inflammasomes are sensory complexes that alert the immune system to the presence of infection or tissue damage. These complexes assemble NLR (nucleotide binding and oligomerization, leucine-rich repeat) or ALR (absent in melanoma 2-like receptor) proteins to activate caspase-1 cleavage and interleukin (IL)-1β/IL-18 secretion. Here, we identified a non-NLR/ALR human protein that stimulates inflammasome assembly: guanylate binding protein 5 (GBP5). GBP5 promoted selective NLRP3 inflammasome responses to pathogenic bacteria and soluble but not crystalline inflammasome priming agents. Generation of Gbp5(-/-) mice revealed pronounced caspase-1 and IL-1β/IL-18 cleavage defects in vitro and impaired host defense and Nlrp3-dependent inflammatory responses in vivo. Thus, GBP5 serves as a unique rheostat for NLRP3 inflammasome activation and extends our understanding of the inflammasome complex beyond its core machinery.

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Food insecurity has been linked to poor physical and mental health as well as HIV risk behaviors. While prior research has shown that drug users are prone to food insecurity it is unclear if drug use exacerbates the physical and psychosocial consequences. A sample of women who used drugs (DU) (specifically heroin and cocaine) and women who did not use drugs (NDU) were examined to determine if the relationship between food insecurity and depression varied by drug use status. Approximately 29% (n=128) of the total sample experienced food insecurity. DU women were more likely to be food insecure. There were no differences in receiving food stamps. After controlling for demographics and receiving food stamps, a significant association between food insecurity and depression existed for both DU and NDU women. The strength of this association was approximately double for NDU women. The study results suggest that it is critical to integrate mental health, food assistance, and other services.

Sleep-related infant deaths in the out-of-home setting have higher odds of having certain risk factors, such as prone placement for sleep and location in a stroller/car seat, rather than in a crib/bassinet. Caregivers should be educated on the importance of placing infants to sleep supine in cribs/bassinets to protect against sleep-related deaths, both in and out of the home.

No abstract