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"Pearson, Jordan"
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The SATB1‐MIR22‐GBA axis mediates glucocerebroside accumulation inducing a cellular senescence‐like phenotype in dopaminergic neurons
by
Martin, Jacqueline
,
Russo, Taylor
,
Kolisnyk, Benjamin
in
Animals
,
Cellular Senescence - genetics
,
Dopaminergic Neurons - metabolism
2024
Idiopathic Parkinson's disease (PD) is characterized by the loss of dopaminergic neurons in the substantia nigra pars compacta, which is associated with neuroinflammation and reactive gliosis. The underlying cause of PD and the concurrent neuroinflammation are not well understood. In this study, we utilize human and murine neuronal lines, stem cell‐derived dopaminergic neurons, and mice to demonstrate that three previously identified genetic risk factors for PD, namely SATB1, MIR22HG, and GBA, are components of a single gene regulatory pathway. Our findings indicate that dysregulation of this pathway leads to the upregulation of glucocerebrosides (GluCer), which triggers a cellular senescence‐like phenotype in dopaminergic neurons. Specifically, we discovered that downregulation of the transcriptional repressor SATB1 results in the derepression of the microRNA miR‐22‐3p, leading to decreased GBA expression and subsequent accumulation of GluCer. Furthermore, our results demonstrate that an increase in GluCer alone is sufficient to impair lysosomal and mitochondrial function, thereby inducing cellular senescence. Dysregulation of the SATB1‐MIR22‐GBA pathway, observed in both PD patients and normal aging, leads to lysosomal and mitochondrial dysfunction due to the GluCer accumulation, ultimately resulting in a cellular senescence‐like phenotype in dopaminergic neurons. Therefore, our study highlights a novel pathway involving three genetic risk factors for PD and provides a potential mechanism for the senescence‐induced neuroinflammation and reactive gliosis observed in both PD and normal aging.
Journal Article
Carcinomas assemble a filamentous CXCL12–keratin-19 coating that suppresses T cell–mediated immune attack
2022
Cancer immunotherapy frequently fails because most carcinomas have few T cells, suggesting that cancers can suppress T cell infiltration. Here, we show that cancer cells of human pancreatic ductal adenocarcinoma (PDA), colorectal cancer, and breast cancer are coated with transglutaminase-2 (TGM2)–dependent covalent CXCL12–keratin-19 (KRT19) heterodimers that are organized as filamentous networks. Since a dimeric form of CXCL12 suppresses the motility of human T cells, we determined whether this polymeric CXCL12–KRT19 coating mediated T cell exclusion. Mouse tumors containing control PDA cells exhibited the CXCL12–KRT19 coating, excluded T cells, and did not respond to treatment with anti–PD-1 antibody. Tumors containing PDA cells not expressing either KRT19 or TGM2 lacked the CXCL12–KRT19 coating, were infiltrated with activated CD8⁺ T cells, and growth was suppressed with anti–PD-1 antibody treatment. Thus, carcinomas assemble a CXCL12–KRT19 coating to evade cancer immune attack.
Journal Article
The SATB1-MIR22-GBA axis mediates glucocerebroside accumulation inducing a cellular senescence-like phenotype in dopaminergic neurons
2023
Idiopathic Parkinson's Disease (PD) is characterized by the loss of dopaminergic neurons in the substantia nigra pars compacta, which is associated with neuroinflammation and reactive gliosis. The underlying cause of PD and the concurrent neuroinflammation are not well understood. In this study, we utilized human and murine neuronal lines, stem cell-derived dopaminergic neurons, and mice to demonstrate that three previously identified genetic risk factors for PD, namely SATB1, MIR22HG, and GBA, are components of a single gene regulatory pathway. Our findings indicate that dysregulation of this pathway leads to the upregulation of glucocerebrosides (GluCer), which triggers a cellular senescence-like phenotype in dopaminergic neurons. Specifically, we discovered that downregulation of the transcriptional repressor SATB1 results in the derepression of the microRNA miR-22-3p, leading to decreased GBA expression and subsequent accumulation of GluCer. Furthermore, our results demonstrate that an increase in GluCer alone is sufficient to impair lysosomal and mitochondrial function, thereby inducing cellular senescence dependent on S100A9 and stress factors. Dysregulation of the SATB1-MIR22-GBA pathway, observed in both PD patients and normal aging, leads to lysosomal and mitochondrial dysfunction due to the GluCer accumulation, ultimately resulting in a cellular senescence-like phenotype in dopaminergic neurons. Therefore, our study highlights a novel pathway involving three genetic risk factors for PD and provides a potential mechanism for the senescence-induced neuroinflammation and reactive gliosis observed in both PD and normal aging.
Journal Article
What X's move to hide our likes means for accountability
2024
[...]journalists and the public were quick to point out that in 2007, Cruz's office unsuccessfully argued in favour of litigation seeking to ban sex toys, writing that masturbation had not been endorsed by the Supreme Court. Some may benefit Cole noted that some communities might see a benefit from private likes — for example adult performers. \"Sex workers have a really hard time with being hidden by algorithms, and maybe this means that they'll get a boost if more people are freely liking their content,\" said Cole, who hosted a CBC podcast focusing on Montreal-based adult entertainment site Pornhub.
Newsletter
Ransomware attack on England's health system highlights life-threatening impact of cybercrime
2024
The National Health Service in England is urging people with universal blood types to donate after a ransomware attack disrupted hospitals' ability to match patients — underlining how cyberattacks can have serious and potentially life-threatening impacts. Experts also believe they have a body count: A 2023 study by researchers at the University of Minnesota estimated that between 42 and 67 Medicare patients died as a result of delayed care due to ransomware attacks between 2016 and 2021. Synnovis CEO Mark Dollar said in a statement on June 4 that the London-based provider is working with law enforcement and that he is \"incredibly sorry for the inconvenience and upset this is causing to patients, service users and anyone else affected.\"
Newsletter
There's a climate threat lurking in rivers around the world. New research shows where
2024
[...]human activity can speed up the decomposition of leaves and other litter, sending more carbon dioxide up into the atmosphere. Accurately modeling these changing dynamics is key to fighting climate change, so a team of researchers led by Scott Tiegs at Oakland University in Michigan organized a global initiative to take stock. The resulting global map illustrates the damaging effects of human activity: parts of the central United States, southern Canada and Europe — areas of high population density, urban development and agriculture — are bright red hotspots for faster decomposition, \"strongly suggesting continental-scale human impacts on carbon cycling in rivers,\" according to the study.
Newsletter
Neuralink looks to the public to solve a seemingly impossible problem
2024
Key to Neuralink's pitch is wireless data transfer. Reportedly, the internal panel overseeing Neuralink's experiments was stuffed with company employees who stood to benefit from the implant reaching the market. Though a 2023 probe from the U.S. Department of Agriculture found no animal welfare violations, the FDA identified several quality control lapses later that year.
Newsletter
Improving Outpatient Follow Up for Hypertensive Patients Post Emergency Department Visit Using a Staff Education and Telephone Referral Intervention
2018
Problem Statement: Americans are increasingly using the Emergency Department (ED) for primary treatment of hypertension, a significant chronic health problem which requires primary care follow-up. Previous studies have shown that between 24–50% of ED patients are lost to ambulatory follow-up. Purpose: The purpose of this DNP project was to determine if primary care provider (PCP) follow-up and utilization rates increased in patients with hypertension who did not have a PCP after receiving an educational intervention and being given a scheduled appointment with a PCP while in the ED. Methods: A quasi-experimental pilot project was implemented with two phases, a pre-intervention data collection phase (phase one) and an intervention phase (phase two). A convenience sample of ED patients who were English speaking, 18 years or older, without a PCP with a discharge diagnosis of hypertension were included. Participants were provided with education on hypertension and given a follow-up appointment with a PCP geographically close to their home at ED discharge. A reminder phone call was placed one day prior to the appointment. Overall percentage of compliance with PCP follow up was assessed. Results: A total of 16 patients were identified for phase one. Fourteen of fifteen patients identified for inclusion in the project participated in phase two. Of the sixteen patients identified for phase one, two of the sixteen followed up as compared to five of the fourteen in phase two. Follow-up improved between phase one and phase two (12.5% to 35.7%), although the differences were not significant (p > .05). Significance: This pilot project among hypertensive adults in a rural, underserved healthcare environment showed improvement in patient follow-up. Although results were not statistically significant, this could be a useful intervention for patients with chronic diseases.
Dissertation
‘The Nazis were right': What the leaders of Canada’s biggest ‘nationalist’ group really want
by
Paas-Lang, Christian
,
Pearson, Jordan
,
Angelovski, Ivan
in
Digital broadcasting
,
Hate speech
,
Nazi groups
2025
The leaders of the country’s biggest white nationalist group believe that “the Nazis were right,” that a violent “race war” for Canada’s future is underway and that non-white people should be deported en masse “at gunpoint,” according to an analysis by the CBC’s visual investigations unit. [...]Sons Canada calls itself a “men’s nationalist club” dedicated to “health and fitness, camaraderie, activism and friendly support for those who share our values.” Steven Rai, a digital research analyst at the Institute for Strategic Dialogue, says the difference between the group's social media posts and the statements in its podcasts is calculated. [...]Sons’ leaders say a race war isn't just looming – “the race war is here,” Vriend said in a livestream from October, referring to the group’s martial arts training and military-style drills.
Newsletter
Sudanese fighters accused of massacres use Canadian-made rifles
2025
Slung over the shoulder of one RSF fighter in the video is a modern-looking, bolt-action precision rifle, with a skeletonized folding stock, a handguard and a high-power scope. According to the article, Sterling Cross opened its commercial arm in 2011, producing rifles and ammunition and advertising to Canadian hunters. According to a 2020 Facebook post, the company was also running tests with the rifle, stating, “New product testing coming along nicely #xlcr #excelsior #ballistics #rangetesting.” According to Badi, under the new legislation, Canadian firms found to be in violation could face prosecution in Canada. | Duration 4:55 The United Arab Emirates has been accused of providing arms to the Rapid Support Forces by U.S. intelligence agencies and human rights groups, although it has repeatedly denied sending weapons.
Newsletter