The justices declined to hear the appeal of the Ferguson-Florissant district over its at-large board elections, which lower courts invalidated as violating the Voting Rights Act.

A school district in a small Arkansas city has installed steel safe rooms in every classroom.

Many are whipsawed by shutdown recommendations aimed at stemming the coronavirus, and the logistical and financial consequences of those actions.

The Winnipeg Jets claimed Kaapo Kahkonen off NHL waivers from the Colorado Avalanche, while the Anaheim Ducks' James Reimer is one of two players now on waivers.

While thousands of students in wildfire-ravaged Northern California resumed classes last week, thousands of others in Alaska stayed home after a 7.0 magnitude earthquake struck Nov. 30.

The College Football Playoff Selection Committee has released its second set of rankings, and Clemson football's moved up to No. 20 following a 24-14 win over Virginia Tech. Starting at No. 23 in last week’s CFP rankings, the Tigers’ latest rise highlights thei

The switch to remote learning in rural New Mexico has left some students profoundly isolated—cut off from others and the grid by sheer distance.

The court declined to take up an appeal backed by school groups of a ruling allowing some property taxpayers challenge their assessments in federal court.

If an opponent isn't contending for an ACC or national championship, Notre Dame is likely to run it out of the gym. That's exactly what happened during the Irish's first road game of the season against Purdue. Much like with the football team less than two months earlier,…

While the Lady Vols volunteered at the Girls Inc. basketball clinic, they reminded Nicky Anosike of her own Tennessee teammates

Five-star wing Deniya Prawl has committed to Lady Vols basketball, marking a significant recruiting win in Kim Caldwell's first year at Tennessee.

Iowa isn't just replacing a generational scoring talent this season. The Hawkeyes also lost their coach and several other pieces from a team that made back-to-back national championship games.

Janiah Barker had 18 points and 11 rebounds, Lauren Betts had 17 points and 12 rebounds and the No. 5 UCLA women rolled past Pepperdine 91-54 on Tuesday. The Bruins (3-0) started the game with an 18-0 run. Ornela Muca, who led Pepperdine (1-2) with 20 points, made a 3-pointer to stop the run.

Tallahassee, FL - The South Georgia Technical College Lady Jets dropped a hard fought three-point loss, 50 – 47, to the nationally ranked Eastern Florida State College Titans before rallying to a 66 – 60 victory over Tallahassee State College in the Tallahassee Community College Classic this weekend to move to 3 – 1 on the season. “We put ourselves in a position to beat a very talented team ...

Tsuneya Ikezu
Oct 2, 2024; 44:e1170242024-e1170242024
Symposium

Prithviraj Rajebhosale
Oct 23, 2024; 44:e0063242024-e0063242024
Cellular

Lindsay P. Cameron
Nov 8, 2023; 43:7472-7482
Symposium and Mini-Symposium

Danilo De Gregorio
Feb 3, 2021; 41:891-900
Symposium and Mini-Symposium

Martijn P. van den Heuvel
Nov 2, 2011; 31:15775-15786
BehavioralSystemsCognitive

Neuronal cytotoxic edema is implicated in neuronal injury and death, yet mitigating brain edema with osmotic and surgical interventions yields poor clinical outcomes. Importantly, neuronal swelling and its downstream consequences during early brain development remain poorly investigated, and new treatment approaches are needed. We explored Ca²⁺-dependent downstream effects after neuronal cytotoxic edema caused by diverse injuries in mice of both sexes using multiphoton Ca²⁺ imaging in vivo [Postnatal Day (P)12–17] and in acute brain slices (P8–12). After different excitotoxic insults, cytosolic GCaMP6s translocated into the nucleus after a few minutes in a subpopulation of neurons, persisting for hours. We used an automated morphology-detection algorithm to detect neuronal soma and quantified the nuclear translocation of GCaMP6s as the nuclear to cytosolic intensity (N/C ratio). Elevated neuronal N/C ratios occurred concurrently with persistent elevation in Ca²⁺ loads and could also occur independently from neuronal swelling. Electron microscopy revealed that the nuclear translocation was associated with the increased nuclear pore size. The nuclear accumulation of GCaMP6s in neurons led to neocortical circuit dysfunction, mitochondrial pathology, and increased cell death. Inhibiting calpains, a family of Ca²⁺-activated proteases, prevented elevated N/C ratios and neuronal swelling. In summary, in the developing brain, we identified a calpain-dependent alteration of nuclear transport in a subpopulation of neurons after disease-relevant insults leading to long-term circuit dysfunction and cell death. The nuclear translocation of GCaMP6 and other cytosolic proteins after acute excitotoxicity can be an early biomarker of brain injury in the developing brain.

Neuregulin1 (Nrg1) signaling is critical for neuronal development and function from fate specification to synaptic plasticity. Type III Nrg1 is a synaptic protein which engages in bidirectional signaling with its receptor ErbB4. Forward signaling engages ErbB4 phosphorylation, whereas back signaling engages two known mechanisms: (1) local axonal PI3K-AKT signaling and (2) cleavage by -secretase resulting in cytosolic release of the intracellular domain (ICD), which can traffic to the nucleus (Bao et al., 2003; Hancock et al., 2008). To dissect the contribution of these alternate signaling strategies to neuronal development, we generated a transgenic mouse with a missense mutation (V₃₂₁L) in the Nrg1 transmembrane domain that disrupts nuclear back signaling with minimal effects on forward signaling or local back signaling and was previously found to be associated with psychosis (Walss-Bass et al., 2006). We combined RNA sequencing, retroviral fate mapping of neural stem cells, behavioral analyses, and various network analyses of transcriptomic data to investigate the effect of disrupting Nrg1 nuclear back signaling in the dentate gyrus (DG) of male and female mice. The V₃₂₁L mutation impairs nuclear translocation of the Nrg1 ICD and alters gene expression in the DG. V₃₂₁L mice show reduced stem cell proliferation, altered cell cycle dynamics, fate specification defects, and dendritic dysmorphogenesis. Orthologs of known schizophrenia (SCZ)-susceptibility genes were dysregulated in the V₃₂₁L DG. These genes coordinated a larger network with other dysregulated genes. Weighted gene correlation network analysis and protein interaction network analyses revealed striking similarity between DG transcriptomes of V₃₂₁L mouse and humans with SCZ.

The superior colliculus receives a direct projection from retinal ganglion cells. In primates, it remains unknown if the same ganglion cells also supply the lateral geniculate nucleus. To address this issue, a double-label experiment was performed in two male macaques. The animals fixated a target while injection sites were scouted in the superior colliculus by recording and stimulating with a tetrode. Once suitable sites were identified, cholera toxin subunit B-Alexa Fluor 488 was injected via an adjacent micropipette. In a subsequent acute experiment, cholera toxin subunit B-Alexa Fluor 555 was injected into the lateral geniculate nucleus at matching retinotopic locations. After a brief survival period, ganglion cells were examined in retinal flatmounts. The percentage of double-labeled cells varied locally, depending on the relative efficiency of retrograde transport by each tracer and the precision of retinotopic overlap of injection sites in each target nucleus. In counting boxes with extensive overlap, 76–98% of ganglion cells projecting to the superior colliculus were double labeled. Cells projecting to the superior colliculus constituted 4.0–6.7% of the labeled ganglion cell population. In one particularly large zone, there were 5,746 cells labeled only by CTB-AF555, 561cells double labeled by CTB-AF555 and CTB-AF488, but no cell labeled only by CTB-AF488. These data indicate that retinal input to the macaque superior colliculus arises from a collateral axonal branch supplied by ~5% of the ganglion cells that project to the lateral geniculate nucleus. Surprisingly, there exist no ganglion cells that project exclusively to the SC.

The precise regulation of Ca²⁺ signals plays a crucial role in the physiological functions of neurons. Here, we investigated the rapid effect of glucocorticoids on Ca²⁺ signals in cultured hippocampal neurons from both female and male rats. In cultured hippocampal neurons, glucocorticoids inhibited the spontaneous somatic Ca²⁺ spikes generated by Kv2.1-organized Ca²⁺ microdomains. Furthermore, glucocorticoids rapidly reduced the cell surface expressions of Kv2.1 and Ca_V1.2 channels in hippocampal neurons. In HEK293 cells transfected with Kv2.1 alone, glucocorticoids significantly reduced the surface expression of Kv2.1 with little effect on K⁺ currents. In HEK293 cells transfected with Ca_V1.2 alone, glucocorticoids inhibited Ca_V1.2 currents but had no effect on the cell surface expression of Ca_V1.2. Notably, in the presence of wild-type Kv2.1, glucocorticoids caused a decrease in the surface expression of Ca_V1.2 channels in HEK293 cells. However, this effect was not observed in the presence of nonclustering Kv2.1S586A mutant channels. Live-cell imaging showed that glucocorticoids rapidly decreased Kv2.1 clusters on the plasma membrane. Correspondingly, Western blot results indicated a significant increase in the cytoplasmic level of Kv2.1, suggesting the endocytosis of Kv2.1 clusters. Glucocorticoids rapidly decreased the intracellular cAMP concentration and the phosphorylation level of PKA in hippocampal neurons. The PKA inhibitor H89 mimicked the effect of glucocorticoids on Kv2.1, while the PKA agonist forskolin abrogated the effect. In conclusion, glucocorticoids rapidly suppress Ca_V1.2-mediated Ca²⁺ signals in hippocampal neurons by promoting the endocytosis of Kv2.1 channel clusters through reducing PKA activity.

Better management of the world's ocean resources is crucial to ensuring food global security, [...]

5 December 2014, Rome – At the closure of the FAO Council held today, the [...]

MANUEL PLANELLES, EL PAÍS, Paris- “Agriculture is seen as a threat in the fight against climate change,” Maria Helena Semedo warns. The Deputy Director-General of the Food and Agriculture Organization [...]

Vientiane.- A delegation of seven Permanent Representatives to the Rome-based Food and Agriculture Organization of the U.N (FAO) concluded a week-long visit to Lao PDR, during which they held meetings [...]

Since the 1990s, rural transformations have helped millions of people exit poverty while remaining in rural areas. This underscores an important fact: revitalising rural economies helps create jobs for rural [...]

Addressing the plenary meeting in the closing session of the 159^th Session of the Council, the Director-General expressed his appreciation to delegates for their commitment and hard work to [...]

The UN hunger report will be released, by FAO, IFAD, UNICEF, WFP and WHO during a joint Press Conference on Tuesday, 11 September, at 11:00 CEST, in FAO-HQ, Sheikh Zayed [...]

26 October 2022, 09.00-16.00 (CEST)

Water is a fundamental resource enabling the production of over 95% of food on land as well the progress of all sustainable development goals [...]

Read the series on how FAO increased efficiency, effectiveness and transparency to better support its Members in the transformation of agrifood systems.

Fish biomass faces steep falls by end of century under high-emissions scenario

Melting permafrost is leading to more frequent rockfalls and landslides on the iconic peak and other areas of the Alps

Sometimes, in fact, nature is stranger than fiction

In a conversation with architect David Rockwell, the philanthropic chef urges an invested effort to create technology that could collect water from the clouds

Scientists have created thin polymer sheets that expand and contract when in contact with water

Smithsonian Secretary Wayne Clough offers personal insights on the realities of climate change and the best ways for society to adapt

The American Ingenuity Award winner warns that no place on Earth is safe from the dangers of global warming

Director of the African American History and Culture Museum Lonnie Bunch looks at the forces that brought about the January 1, 1863 order.