#Cell Response

Fever isn’t just a symptom - it’s a finely tuned biological mechanism that helps your immune system respond faster and more efficiently. Watch this reel to see immune cells moving faster when the temperature rises. Small increases in body temperature (just 1–2°C) have profound effects on immune cells, including dendritic cells, T cells, macrophages, and neutrophils, by directly influencing their motility, polarization, chemotaxis, and target-search behavior - all independently of the surrounding tissue environment. 
Live imaging in zebrafish embryos, mouse tissue explants, and 3D cultures shows that these temperature shifts accelerate cell migration, tissue exploration, and arrival at wounds or lymphatic vessels, while cooler conditions can delay immune responses by 10–20 hours. Experiments using lymphatic vessel geometries confirmed that even subtle thermokinetic changes significantly impact encounter rates between immune cells and their targets.
 What’s driving this temperature effect?
A slight rise in temperature makes Myosin II work harder, tightening the actomyosin network and allowing immune cells to move faster and more efficiently. This is a rapid and reversible “thermo-boost” that enhances immune surveillance. 
That’s why fever is most beneficial during infections or tissue injury, where a slightly higher temperature can give your immune system the edge it needs to respond quickly and effectively - essentially turning up the speed of your body’s natural defense network.
 Credits: Company-Garrido I. et al. Developmental Cell 2025 #scientist #science #immunology #medicine #laboratory

Your body runs a continuous microscopic war. Viruses replicate, mutate, and spread; immune cells hunt, collide, and clear them. This simulation shows that battle in real time. You see two populations: viruses (pink) and immune defenders (blue). Viruses spawn and replicate at rates you control; mutation makes strains faster and harder to clear. Immune cells use nearest-target pursuit with limited speed and attack cooldowns—they lock onto the closest virus and reduce its hit points on contact. The balance between viral growth and immune clearance decides whether the infection is contained or takes over. Mathematically this is captured by dynamics like dV/dt = βV − kIV: viral growth (βV) versus immune clearance (kIV). When immune kill capacity exceeds replication (kI greater than β), the system can recover; otherwise viral load and infection pressure rise and tissue health drops. Small changes in spawn rate, mutation, immune cell count, or response strength visibly shift the outcome—containment, equilibrium, or collapse. Try simulations at: https://simulateitnow.com #ImmuneSystem #Virus #CellularWarfare #Immunology #ScienceSimulation #STEM #Biology #InfectionDynamics #ScienceEducation #Visualization #InteractiveLearning #ComplexSystems #PublicHealth #ViralReplication #ImmuneResponse

For decades, scientists knew the immune system could attack the body itself — but they didn’t fully understand why. The discovery of the FOXP3 gene and Regulatory T cells (Tregs) changed everything. Mary E. Brunkow and fellow researchers helped uncover how Tregs act as the immune system’s “brakes,” preventing uncontrolled inflammation and self-destruction. FOXP3 programs these cells to maintain immune balance — a mechanism known as immune tolerance. When FOXP3 fails, the consequences are severe autoimmunity. When it functions properly, the immune system protects without turning against us. This discovery did not create a cure. But it redefined our understanding of autoimmunity and opened new pathways toward targeted, potentially curative therapies. One gene. Immune balance. A turning point in immunology. 🧬 Tags: [ #MedicalScience, Immunology, AutoimmuneDisease, Autoimmunity, ImmuneSystem, STEM, WomenInSTEM, FutureOfMedicine, MedicalEducation, MedEd, HealthcareEducation, MedStudentLife, NursingStudent, BiologyReels, ScienceCommunication, ResearchReels, Genetics, MolecularBiology, CellBiology, TCells, FOXP3, ClinicalScience, ScientificDiscovery, NobelPrize, Thoughts]

T cells would be prepping for full on war after this 😅 #immunology #science #immunesystem #immunesupport #onthisday

join the STEM discord to discuss the immune response with other science majors, link in bio! what's your favorite class of immunoglobulin? disclaimer: this is more of an "adaptive immunity" edit as there are some clips of cytotoxic T cells. sources: CrashCourse Immune System, Part 2: Crash Course Anatomy & Physiology, nature video Decoding cancer immunology: Hunting hidden tumours, XVIVO in collab with VMP How do Antibodies Work? and The Adaptive Immune System, American Society for Cell Biology ASCB Celldance 2014 Cytotoxic T-Cells on Patrol Alex Ritter Kothari M, Wanjari A, Acharya S, Karwa V, Chavhan R, Kumar S, Kadu A, Patil R. A Comprehensive Review of Monoclonal Antibodies in Modern Medicine: Tracing the Evolution of a Revolutionary Therapeutic Approach. Cureus. 2024 Jun 9;16(6):e61983. "Köhler and Milstein introduced hybridoma technology in 1975, a pioneering advancement in biotechnology that has since transformed the landscape of monoclonal antibody production [11]. This innovative technique involves the fusion of antibody-producing B cells with immortal myeloma cells, resulting in hybrid cells termed hybridomas capable of continuous, high-yield production of specific antibodies [12-16]... Monoclonal antibodies have a "Y-shaped" structure composed of four polypeptide chains: two identical heavy chains and two identical light chains. The total molecular weight of a monoclonal antibody is around 150 kDa. The two arms of the "Y" are called the Fab (antigen-binding fragment) regions, which contain the variable domains responsible for antigen binding. The stem of the "Y" is called the Fc (fragment crystallizable) region, which determines the class/isotype of the antibody and mediates effector functions." #immuneresponse #immunesystem #bcells #antibodies #antibody

Emergency Exit Ramps: Adhesion Molecules When immune cells are needed in a specific tissue, they need a quick exit strategy to get off the highway of your bloodstream. Adhesion molecules are how they pull over and get to where they’re needed most. First, selectins on immune cells and endothelial cells interact. This triggers immune cells to fire their inside out signal to turn on integrins. This allows integrins to bind cells more securely which prevents immune cells from getting carry away by the flow. Then they can squeeze into the tissue where they’re needed. #immunity #immunology #scicomm #sciencecommunication #immunesystem

Early food sensitization. Symptoms managed empirically. As immune involvement broadens, testing expands — but remains fragmented. ANA positivity appears years later, after multi-system involvement. The issue wasn’t test availability. It was diagnostic sequencing. #immunediagnostics #LaboratoryMedicine#amindobiologics #lifesciences (Sensitization, immune, ana, diagnostic)

Representative inflammatory pathways & activated innate immunity in MPS🧬Activation of the innate immune response ultimately leads to the secretion of IL-1β,IL-6, TNF-α,IL-18, or matrix metalloproteinases(MMPs)by immune cells,including microglia,monocytes,& macrophage,with the activated NF-κB signaling pathway & NLRP3 inflammasome.MMPs degrade the extracellular matrix of various tissues,including the skeletal system, which may be related to the symptoms of MPS.Once these secreted cytokines bind to their respective receptors, activated cells(for example, chondrocytes,synovial cells, periodontal ligament fibroblasts,cardiomyocytes,& squamous epithelial cells)can also express MMPs.Buffolo et al. reported that IL-1β ⬇️the excitatory synapses of mouse neurons in vitro with⬇️ frequency & amplitude of spontaneous synaptic currents,⬇️density of excitatory synaptic connections,&⬇️frequency of action potential-evoked Ca2+ transients.IL-1β & TNF-α can induce the compromise & apoptosis of astrocytes. Moreover,secreted IL-18 may induce positive feedback of the inflammatory pathway via MyD88 & NF-κB because macrophages & microglia express IL-18 receptors on their cell membrane🧬Black arrows indicate activated pathways in MPS.Green arrows indicate pathways that are not considered to be activated.Red arrows indicate enhanced expression of each substance.Short, flat vertical lines at the tips of the dotted lines indicate inhibition by the reagent.Reagents that have been tested in MPS models are colored red. @biochemistry_nutrition_medlab #biochemistry #nutrition #medlab #drshamimkhandan #دكتر_شميم_خندان_علمدارى

🧠 Inside Your Body Science Immunity — Episode 6 Fever is a controlled increase in body temperature triggered by the immune system. When infection is detected, immune cells release chemical signals that act on the brain, raising the body’s temperature set point. A higher temperature can slow pathogen growth and enhance immune activity. Fever is not the disease itself — it is part of the body’s defense strategy. #InsideYourBodyScience #ImmuneSystem #Immunity #HumanBiology #MedicalEducation #Fever #Inflammation #BiologyExplained #ScienceEducation #LearnSomethingNew

How do immune cells eat something bigger than themselves? Macrophages are professional phagocytes - meaning they “eat” pathogens like bacteria and fungi. But some microbes don’t make it easy. Fungal pathogens such as Candida albicans can switch from a round cells form to long, filament-like structures called hyphae. These hyphae can be much longer than the macrophage itself, making them physically challenging to engulf and helping the fungus evade immune killing. So what do macrophages do? They fold them. Like cellular origami, macrophages use their internal “muscles” - the actin–myosin cytoskeleton - to bend and fold fungal hyphae. This study published in Proceedings of the National Academy of Sciences of the United States of America shows that immune cells don’t just rely on biochemical killing mechanisms - they apply mechanical force. Even after internalization, macrophages continue exerting force on the hyphae. Folding physically damages the hyphae, inhibits their growth, and facilitates complete engulfment. Credits: Bain JM et al. PNAS 2021 #scientist #science #immunology #medicine #biology

How do immune cells eat something bigger than themselves? Macrophages are professional phagocytes - meaning they “eat” pathogens like bacteria and fungi. But some microbes don’t make it easy. Fungal pathogens such as Candida albicans can switch from a round cells form to long, filament-like structures called hyphae. These hyphae can be much longer than the macrophage itself, making them physically challenging to engulf and helping the fungus evade immune killing. So what do macrophages do? They fold them. Like cellular origami, macrophages use their internal “muscles” - the actin–myosin cytoskeleton - to bend and fold fungal hyphae. This study published in Proceedings of the National Academy of Sciences of the United States of America shows that immune cells don’t just rely on biochemical killing mechanisms - they apply mechanical force. Even after internalization, macrophages continue exerting force on the hyphae. Folding physically damages the hyphae, inhibits their growth, and facilitates complete engulfment. Credits: Bain JM et al. PNAS 2021 #scientist #science #immunology #medicine #biology

A tiny battlefield inside your body where a macrophage one of the most powerful immune cells spots a dangerous bacterium and instantly switches into hunter mode. This chase isn’t just random movement… It’s a highly coordinated immune response driven by: ✅ Chemotaxis – macrophage senses chemical signals released by bacteria ✅ Movement toward the infection site ✅ Recognition of the invader ✅ Engulfing and digesting it through phagocytosis Macrophages act as: 🛡️ First line defenders 🧹 Cleaners that remove pathogens and dead cells 📢 Messengers that alert other immune cells 🧬 Key players in inflammation and tissue repair So when you see a macrophage chasing a bacterium, you’re literally watching your body fight to keep you alive in real-time. This microscopic drama happens thousands of times every single day without you even noticing. Let’s take a moment to appreciate this incredible biology that protects us silently and endlessly. Your body is truly a masterpiece.