The cAMP effector PKA mediates Moody GPCR signaling in < i > Drosophila < /i > blood –brain barrier formation and maturation
The blood –brain barrier (BBB) ofDrosophila comprises a thin epithelial layer of subperineural glia (SPG), which ensheath the nerve cord and insulate it against the potassium-rich hemolymph by forming intercellular septate junctions (SJs). Previously, we identified a novel Gi/Go protein-coupled receptor (GPCR), Moody, as a key factor in BBB formation at the embryonic stage. However, the molecular and cellular mechanisms of Moody signaling in BBB formation and maturation remain unclear. Here, we identify cAMP-dependent protein kinase A (PKA) as a crucial antagonistic Moody effector that is required for the formation, as w...
Source: eLife - August 12, 2021 Category: Biomedical Science Tags: Cell Biology Developmental Biology Source Type: research
A genetic intervention
A tool that analyzes the genome of parasites found in the blood of malaria patients can help inform policy decisions on how best to tackle the rise in drug-resistant infections. (Source: eLife)
Source: eLife - August 12, 2021 Category: Biomedical Science Tags: Epidemiology and Global Health Microbiology and Infectious Disease Source Type: research
Loss of < i > N < /i > < sup > 1 < /sup > -methylation of G37 in tRNA induces ribosome stalling and reprograms gene expression
N1-methylation of G37 is required for a subset of tRNAs to maintain the translational reading-frame. While loss of m1G37 increases ribosomal +1 frameshifting, whether it incurs additional translational defects is unknown. Here we address this question by applying ribosome profiling to gain a genome-wide view of the effects of m1G37 deficiency on protein synthesis. UsingE. coli as a model, we show that m1G37 deficiency induces ribosome stalling at codons that are normally translated by m1G37-containing tRNAs. Stalling occurs during decoding of affected codons at the ribosomal A site, indicating a distinct mechanism than tha...
Source: eLife - August 12, 2021 Category: Biomedical Science Tags: Microbiology and Infectious Disease Source Type: research
A feedback loop between the androgen receptor and 6-phosphogluoconate dehydrogenase (6PGD) drives prostate cancer growth
This study provides insight into both hallmarks by uncovering a novel link between AR and the pentose phosphate pathway (PPP). Specifically, we identify 6-phosphogluoconate dehydrogenase (6PGD) as an androgen-regulated gene that is upregulated in prostate cancer. AR increased the expression of6PGDindirectly via activation of sterol regulatory element binding protein 1 (SREBP1). Accordingly, loss of 6PGD, AR or SREBP1 resulted in suppression of PPP activity, as revealed by 1,2-13C2 glucose metabolic flux analysis. Knockdown of 6PGD also impaired growth and elicited death of prostate cancer cells, at least in part due to inc...
Source: eLife - August 12, 2021 Category: Biomedical Science Tags: Cancer Biology Source Type: research
Gaps in global wildlife trade monitoring leave amphibians vulnerable
As the biodiversity crisis continues, we must redouble efforts to understand and curb pressures pushing species closer to extinction. One major driver is the unsustainable trade of wildlife. Trade in internationally regulated species gains the most research attention, but this only accounts for a minority of traded species and we risk failing to appreciate the scale and impacts of unregulated legal trade. Despite being legal, trade puts pressure on wild species via: direct collection, introduced pathogens, and invasive species. Smaller species-rich vertebrates, such reptiles, fish, and amphibians, may be particularly vulne...
Source: eLife - August 12, 2021 Category: Biomedical Science Tags: Ecology Source Type: research