Biology subjects

Lynch, A.

Publications and source records attributed to Lynch, A..

10 recordsLinked to original sources

bioRxiv2026

Early life adversity enhances prosocial helping towards a cagemate and reshapes brain-wide neural activity and network organization

Early life adversity (ELA) is linked to changes in social behavior and emotional regulation and to increased risk for developing mood and conduct disorders. However, the effects of ELA on empathy and its associated behaviors, including prosocial helping, remain poorly understood. Animal models of ELA provide a tractable way to study how early rearing conditions impact prosocial behavior and underlying neural circuitry. In the current study, adult male and female rats reared under maternal separation (MS) or control conditions were tested in a helping behavior task in which they could release a trapped cagemate. Behavior was assessed across repeated testing sessions and brain-wide neural activity was quantified using c-Fos on the final test day. Contrary to our hypothesis, we found that MS-reared rats showed more consistent helping behavior, with shorter latencies to help on average, compared to control-reared animals. In addition, MS-reared rats displayed increased social play following release. At the neural level, MS-reared rats displayed more c-Fos expression across multiple brain regions, including prefrontal, amygdala, sensory, and striatal regions involved in motivation and social decision making. Network analyses further revealed altered functional connectivity in ELA-reared animals, with heightened connectivity in stress-related regions such as the lateral habenula. Together, these findings demonstrate that ELA impacts prosocial helping behavior and is associated with widespread changes in neural activity and network organization. This work provides insight into how early adversity shapes social motivation and the neural systems supporting prosocial behaviors.

neuroscience↗

bioRxiv2026

Computationally Optimized H1 and H3 Hemagglutinin Messenger RNA Vaccines Confer Broad Protective Immunity Against Modern Influenza Viruses

The hemagglutinin (HA) glycoprotein of seasonal influenza viruses undergoes continual antigenic drift, contributing to vaccine mismatch and reduced effectiveness of strain-specific seasonal vaccines. Although vaccination remains the most effective strategy for preventing influenza disease, conventional egg-based vaccine production requires several months and may not keep pace with viral evolution. Messenger RNA (mRNA) vaccines offer a promising alternative because they can be rapidly updated to encode emerging antigens and are manufactured through a scalable, cell-free process that avoids propagation associated adaptations. To address the challenges of antigenic drift and vaccine mismatch, we combined mRNA vaccine technology with Computationally Optimized Broadly Reactive Antigens (COBRA) to develop broadly protective influenza HA vaccines. These COBRA H1 and H3 mRNA HA vaccines elicited robust antigen-specific IgG, hemagglutination inhibition (HAI), and neutralizing antibody responses against diverse historical and contemporary influenza strains in cohorts of influenza naive and pre-immune mice. Vaccination also induced strong cellular immunity, characterized by the expansion of antigen-specific antibody and cytokine secreting cells. These responses were further enhanced in animals with pre-existing influenza immunity, as demonstrated by an increased frequency of IFN-{gamma} producing cells recognizing conserved HA stalk-based peptides. Together, these findings demonstrate that COBRA HA encoding mRNA vaccines can effectively leverage immunological memory while expanding responses to conserved HA epitopes, supporting improved protection against antigenically drifted strains. Thus, the combination of broadly reactive COBRA HA antigens with a rapidly adaptable and manufacturable mRNA platform represents a promising strategy for next-generation influenza vaccination.

immunology↗

bioRxiv2026

Overlapping flower and pollen production in two imperiled pitcher plants raises conservation challenges

Balancing sexual reproduction with vegetative growth poses challenges for many plants. Additionally, reproductive effort, such as production of pollen or flowers, is not always correlated with numbers of viable and germinable seeds. Energetic tradeoffs like these can be particularly fraught for imperiled species and might be especially complicated in landscapes with a possibility of interspecific hybridization. In this multi-year study, we track the reproductive effort, flowering phenology, and reproductive output of two interfertile Sarracenia (pitcher plants). We show that reproductive effort varies among years and sites, and that production of pollen and flowers does not always result in higher seed output. We demonstrate that phenological overlap in the timing of flower production and pollen viability could enable hybridization, and that the more imperiled taxon produces fewer seeds per flower. Results have implications for conservation of these pitcher plants, management of hybridization in these and other systems, and general principles of reproductive allocation.

ecology↗

bioRxiv2026

AB-Free Kava and its Kavalactones Suppress Cigarette Smoke- and Lipopolysaccharide-Induced Lung Inflammation: Efficacy and Mechanisms

Cigarette smoke-induced lung inflammation is a central driver of pulmonary diseases. The limited efficacy of current anti-inflammatory agents underscores the need for structurally novel therapeutics with distinct mechanisms. We recently demonstrated that AB-free kava, a flavokavains A/B-depleted formulation from Piper methysticum containing six major kavalactones, effectively suppresses cigarette smoke-induced lung inflammation in mice. This study aims to identify the bioactive constituent(s) and elucidate underlying mechanisms. These kavalactones revealed a clear structure-activity relationship in suppressing lipopolysaccharide (LPS)-stimulated prostaglandin E2 (PGE2) production in macrophages with desmethoxyyangonin (DMY) as the most potent kavalactone whereas dihydrokavain (DHK, a structurally similar analog) with minimal activity. DMY also effectively reduced LPS-induced interleukin-6 (IL-6) and tumor necrosis factor alpha (TNF-) production while DHK was ineffective. Mechanistically, DMY, but not DHK, attenuated COX-2 induction and reduced phosphorylation of cAMP response element-binding protein (CREB). Pharmacological inhibition of protein kinase A (PKA) similarly reduced p-CREB, COX-2 and PGE2, supporting a PKA-dependent CREB/COX-2 signaling in mediating PGE2 suppression while these effects were independent of nuclear factor kappa B (NF-{kappa}B) and activator protein 1 (AP-1) signaling. Similar results were observed for DMY and DHK in attenuating cigarette smoke condensate-induced proinflammatory pathways and PGE2 production. Consistently, DMY demonstrated significant in vivo efficacy in suppressing cigarette smoke-induced lung inflammation while DHK was not effective. Interestingly, dihydromethysticin (DHM) demonstrated the greatest in vivo anti-inflammatory efficacy, although it only exhibited moderate in vitro potency, likely due to its superior bioavailability over DMY. Concordantly, cigarette smoke exposure elevated p-CREB and COX-2 expressions in mouse lungs, which were attenuated by AB-free kava and its bioactive kavalactones with the extent of suppression correlating with their in vivo anti-inflammatory efficacy. DHM effectively suppressed LPS-induced neutrophil accumulation in mouse lungs as well. Collectively, these studies identify bioactive kavalactones in AB-free kava that suppress cigarette smoke- and LPS-induced lung inflammation through the modulation of the PKA/CREB/COX-2 signaling axis, providing a foundation for developing structurally distinct anti-inflammatory agents, particularly targeting smoke-induced inflammation and associated pulmonary diseases.

immunology↗

bioRxiv2026

Bacterial Aminopeptidase-Activated Peptide Prodrug Enables Species-Selective Targeting of Pseudomonas aeruginosa

Pseudomonas aeruginosa is an adaptable organism, frequently found in chronic infections, and for which antimicrobial resistance is a growing concern. Therefore, there is an urgent need for alternative therapeutic strategies. Cationic antimicrobial peptides (AMPs) offer potent bactericidal activity but suffer from limited selectivity and potential host toxicity. To enhance species-specific targeting, we designed two prodrug variants of the AMP D-Bac8CLeu2,5 - EEEE{square}-Bac8CLeu2,5 and ELE{square} D-Bac8CLeu2,5 --engineered for activation by the P. aeruginosa extracellular aminopeptidase PaAP. While both prodrug motifs effectively neutralized the positive charge of D-Bac8CLeu2,5 and prevented DNA-peptide complex formation, EEEE{square}-Bac8CLeu2,5 showed negligible antimicrobial activity due to slow and incomplete activation. In contrast, ELEG{square}-Bac8CLeu2,5 underwent rapid PaAP{square}mediated activation, restoring bactericidal activity in planktonic cultures and biofilms. PaAP contributed significantly to complete prodrug activation, particularly within biofilms, where the accumulation of partially activated intermediates correlated with biphasic killing kinetics. The prodrug showed reduced activity against other ESKAPEE pathogens, demonstrating selective activation by P. aeruginosa. Experiments selecting resistant bacteria revealed distinct mutations in lipopolysaccharide biosynthesis pathways for D-Bac8CLeu2,5 and the prodrug, with limited cross{square}resistance. These findings establish aminopeptidase{square}activated AMP prodrugs as a promising approach for species{square}selective antimicrobial therapy and highlight the feasibility of exploiting bacterial enzymes for controlled antimicrobial peptide activation.

microbiology↗

bioRxiv2023

An inducible tricolor reporter mouse for simultaneous imaging of lysosomes, mitochondria and microtubules

Cell-type-specific use of the same DNA blueprint generates diverse cell types. Such diversity must also be executed via differential deployment of the same subcellular machinery. However, our understanding of the size, distribution, and dynamics of subcellular machinery in native tissues, and their connection to cellular diversity, remain limited. We generate and characterize an inducible tricolor reporter mouse, dubbed "kaleidoscope", for simultaneous imaging of lysosomes, mitochondria and microtubules in any cell type and at a single cell resolution. The expected subcellular compartments are labeled in culture and in tissues with no impact on cellular and organismal viability. Quantitative and live imaging of the tricolor reporter captures cell-type-specific organelle features and kinetics in the lung, as well as their changes after Sendai virus infection. Yap/Taz mutant lung epithelial cells undergo accelerated lamellar body maturation, a subcellular manifestation of their molecular defects. A comprehensive toolbox of reporters for all subcellular structures is expected to transform our understanding of cell biology in tissues. SUMMARY STATEMENTOur understanding of subcellular machinery is often inferred from that in cultured cells. Hutchison et al. have generated a tricolor tunable reporter mouse for simultaneous imaging of lysosomes, mitochondria and microtubules in the native tissues at a single-cell resolution.

developmental biology↗

bioRxiv2023

Aryl Hydrocarbon Receptor Suppresses Eosinophilic Esophagitis Responses through OVOL1 and SPINK7

Eosinophilic esophagitis (EoE) is a type 2 allergic disease characterized by esophageal inflammation and epithelial cell dysfunction. Acquired loss of the anti-serine protease of kazal type 7 (SPINK7) in the squamous epithelium of the esophagus has a causal role in EoE pathogenesis. Yet there is a limited understanding of the factors that regulate its expression and responsiveness to inflammatory stimuli. Herein, we identified the transcription factor, ovo like transcriptional repressor 1 (OVOL1) as an esophageal selective gene product that regulates SPINK7 promoter activity. Overexpression of OVOL1 increased SPINK7 expression, whereas, its depletion decreased SPINK7 expression, impaired epithelial barrier and increased production of the pro-atopy cytokine thymic stromal lymphopoietin (TSLP). Mechanistically, ligands of AHR induced nuclear translocation of OVOL1 which in turn promoted epithelial cell differentiation, barrier function and SPINK7 expression. Interleukin (IL)-4 and IL-13 abolished AHR ligand-induced OVOL1 nuclear translocation. Stimulation with IL-13 abrogated the nuclear translocation of OVOL1 and promoted enhanced degradation of OVOL1 protein. This effect of IL-13 was dependent on the esophageal specific cysteine protease calpain-14. Translational studies demonstrated loss of OVOL1 protein expression in patients with EoE. In summary, AHR mediates its action via OVOL1-induced SPINK7 transcription, and IL-4 and IL-13 repress this pathway in EoE. As such, activation of the AHR pathway is a potential intervention strategy for reversing EoE. Graphical abstract O_FIG O_LINKSMALLFIG WIDTH=200 HEIGHT=112 SRC="FIGDIR/small/541192v1_ufig1.gif" ALT="Figure 1"> View larger version (20K): org.highwire.dtl.DTLVardef@1e946a1org.highwire.dtl.DTLVardef@1c087forg.highwire.dtl.DTLVardef@71ecc8org.highwire.dtl.DTLVardef@17044da_HPS_FORMAT_FIGEXP M_FIG C_FIG The influence of the exposome on regulatory networks in EoE pathogenesis. AHR is activated and influenced by diet nutrients, environmental toxicants, microbiome composition, tryptophan metabolites, and drugs. When AHR is activated, it promotes translocation of OVOL1 to the nucleus, which in turn promotes expression of epithelial genes including SPINK7. SPINK7 expression promotes epithelial differentiation, barrier function, decreased proteolytic activity, and decreased TSLP production. IL-4 and IL-13 inhibit OVOL1 nuclear translocation and therefore, repress SPINK7 expression. IL-13-stimulated CAPN14 expression decreases OVOL1 protein expression and SPINK7 transcription.

immunology↗

bioRxiv2022

MetaTiME: Meta-components of the Tumor Immune Microenvironment

Recent advances in single-cell RNA sequencing have revealed heterogeneous cell types and gene expression states in the non-cancerous cells in tumors. The integration of multiple scRNA-seq datasets across tumors can reveal common cell types and states in the tumor microenvironment (TME). We developed a data driven framework, MetaTiME, to overcome the limitations in resolution and consistency that result from manual labelling using known gene markers. Using millions of TME single cells, MetaTiME learns meta-components that encode independent components of gene expression observed across cancer types. The meta-components are biologically interpretable as cell types, cell states, and signaling activities. By projecting onto the MetaTiME space, we provide a tool to annotate cell states and signature continuums for TME scRNA-seq data. Leveraging epigenetics data, MetaTiME reveals critical transcriptional regulators for the cell states. Overall, MetaTiME learns data-driven meta-components that depict cellular states and gene regulators for tumor immunity and cancer immunotherapy.

genomics↗

bioRxiv2018

Characterization of the role of glycine lipids in Bacteroides thetaiotaomicron

Acylated amino acids function as important components of the cellular membrane in some bacteria. Biosynthesis is initiated by the N-acylation of the amino acid and this is followed by subsequent O-acylation of the acylated molecule resulting in the production of the mature diacylated amino acid lipid. In this study we use both genetics and liquid chromatography-mass spectrometry (LC-MS) to characterize the biosynthesis and function of novel diacylated glycine lipid (GL) species in Bacteroides thetaiotaomicron. We, and others, have previously reported the identification of a gene, named glsB in this study, that encodes a N-acyltransferase activity responsible for the production of a monoacylated glycine called N-acyl-3-hydroxy-palmitoyl glycine (or commendamide). In all of the Bacteroidales genomes so far sequenced the glsB gene is located immediately downstream from a gene, named glsA, also predicted to encode a protein with acyltransferase activity. We use LC-MS to show that co-expression of glsB and glsA results in the production of GL in Escherichia coli. We constructed a deletion mutant of the glsB gene in B. thetaiotaomicron and we confirm that glsB is required for the production of GL in B. thetaiotaomicron. Moreover, we show that glsB is important for the ability of B. thetaiotaomicron to adapt to stress and colonize the mammalian gut. Therefore, this report is the first to describe the genetic requirements for the biosynthesis of GL, a novel diacylated amino acids species that contributes to fitness in the human gut bacterium, B. thetaiotaomicron.

microbiology↗

bioRxiv2018

Genetic, inflammatory, and tissue-specific factors control expression of human calpain-14

Eosinophilic esophagitis (EoE) is a chronic, food-driven allergic disease resulting in eosinophilic esophageal inflammation. We recently found that EoE susceptibility is associated with genetic variants in the promoter of CAPN14, a gene with reported esophagus-specific expression. CAPN14 is dynamically up-regulated as a function of EoE disease activity and after exposure of epithelial cells to interleukin-13 (IL-13). Herein, we aimed to explore molecular modulation of CAPN14 expression. We identified three putative binding sites for the IL-13-activated transcription factor STAT6 in the promoter and first intron of CAPN14. Luciferase reporter assays revealed that the two most distal STAT6 elements were required for the ~10-fold increase in promoter activity subsequent to stimulation with IL-13 or IL-4, and also for the genotype-dependent reduction in IL-13-induced promoter activity. One of the STAT6 elements in the promoter was necessary for IL-13-mediated induction of CAPN14 promoter activity while the other STAT6 promoter element was necessary for full induction. Chromatin immunoprecipitation in IL-13 stimulated esophageal epithelial cells was used to further support STAT6 binding to the promoter of CAPN14 at these STAT6 binding sites. The highest CAPN14 and calpain-14 expression occurred with IL-13 or IL-4 stimulation of esophageal epithelial cells under culture conditions that allow the cells to differentiate into a stratified epithelium. This work corroborates a candidate molecular mechanism for EoE disease etiology in which the risk variant at 2p23 dampens mediated CAPN14 expression in differentiated esophageal epithelial cells following IL-13/STAT6 induction of CAPN14 promoter activity.

genomics↗