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Multiple Sclerosis l: Introduction01:19

Multiple Sclerosis l: Introduction

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Multiple sclerosis is a chronic autoimmune disease of the central nervous system (CNS) that affects the brain, spinal cord, and optic nerves. It is an inflammatory demyelinating disorder and a leading cause of neurological disability in young adults.EpidemiologyMS commonly begins between 20 and 40 years of age and is twice as common in women. Its exact cause remains unclear, but genetic susceptibility contributes, with higher risk in first-degree relatives and identical twins. A greater...
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Disorders of erythrocytes, or red blood cells (RBCs), include a range of conditions affecting their number, shape, or function.
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Lifecycle of Erythrocytes01:22

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Erythrocytes, also known as red blood cells, constantly move through blood capillaries. As a result, they damage their plasma membrane due to the continuous friction. Typically, after 100 to 120 days, erythrocytes become rigid and fragile as they wear out. As they pass through small vessels in the spleen and liver, they can get trapped and break apart into fragments.
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Erythropoiesis

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Red blood cells  (RBCs) transport oxygen to all body tissues. These cells survive only for 120 days and then need to be replenished. Erythropoiesis is the process of RBC production. In healthy individuals, erythropoiesis ensures all tissues are amply supplied with oxygen. In addition, blood loss due to injury leads to a drop in the physiological oxygen level that will cause erythropoiesis. Any defect in erythropoiesis leads to several physiological disorders, including thalassemia, anemia,...
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The cardiovascular system regulates the number of erythrocytes in the bloodstream to ensure optimal oxygen transport. It also prevents over-proliferation of these cells, which helps to maintain blood viscosity and flow rate.
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Structure and Function of Erythrocytes01:29

Structure and Function of Erythrocytes

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There are between 4.2 and 6 million erythrocytes, also known as red blood cells, in every microliter of blood. These cells are small, flattened biconcave discs with centers that are depressed.
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Characterization of Sickling During Controlled Automated Deoxygenation with Oxygen Gradient Ektacytometry
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Erythrocyte Fragility in Progressive Multiple Sclerosis.

Carmen Jacob1,2, Thomas E Williams3, Charlotte M Stuart1

  • 1Clinical Neurosciences, Clinical & Experimental Sciences, Faculty of Medicine, University of Southampton, Southampton, UK.

European Journal of Neurology
|April 17, 2026
PubMed
Summary
This summary is machine-generated.

People with progressive multiple sclerosis (MS) show increased erythrocyte fragility, potentially releasing hemoglobin and contributing to brain atrophy. This finding suggests new therapeutic targets for MS neurodegeneration.

Keywords:
erythrocytehaemoglobinhaemolysismultiple sclerosisosmotic fragility

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Area of Science:

  • Neuroscience
  • Hematology
  • Pathology

Background:

  • Aberrant iron homeostasis is a key feature in progressive multiple sclerosis (MS).
  • The source of excess brain iron is unclear, but hemoglobin from fragile erythrocytes is a possibility.
  • Investigating erythrocyte fragility in MS could reveal mechanisms of neurodegeneration.

Purpose of the Study:

  • To determine if erythrocytes are more fragile in people with progressive MS (PwPMS).
  • To examine the association between erythrocyte fragility and brain atrophy in PwPMS.

Main Methods:

  • A case-control study involving 174 participants (75 PwPMS, 99 controls).
  • Assessed erythrocyte fragility using Median Corpuscular Fragility (MCF) and haemolysis curve slope.
  • Correlated erythrocyte fragility with MRI-measured brain atrophy over three years in a subset of PwPMS.

Main Results:

  • No significant difference in MCF between PwPMS and controls.
  • PwPMS exhibited a less steep haemolysis curve slope, indicating a subpopulation of fragile erythrocytes (p=0.017).
  • Erythrocyte fragility correlated with reduced normalized whole brain volume in PwPMS.

Conclusions:

  • Fragile erythrocytes and subsequent extracellular hemoglobin release may contribute to neurodegeneration in progressive MS.
  • Further research is needed to understand the link between erythrocyte health, inflammation, and neurodegeneration.
  • This research may inform novel therapeutic strategies for MS.