Hemoglobin S Reduction
Hemoglobin S Reduction - Related Videos
01:24
Hemoglobin
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2024
Hemoglobin is a globular protein made up of four subunits. Two of these subunits are alpha chains, and the other two are beta chains. Each subunit contains a molecule of heme, which has an iron atom and can bind to oxygen. When an oxygen molecule binds to one heme group, it changes the shape of hemoglobin, making it easier for the other heme groups to bind oxygen as well. When all four heme groups are bound to oxygen, the resulting molecule is called oxyhemoglobin. As a result, arterial blood...
06:37
Staphylococcus aureus Growth using Human Hemoglobin as an Iron Source
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Cited by 31 •
2013
Here we describe a growth assay for Staphylococcus aureus using hemoglobin as the sole source of available nutrient iron. This assay establishes the role of bacterial factors involved in hemoglobin-derived iron acquisition.
05:18
A Rapid and Chemical-free Hemoglobin Assay with Photothermal Angular Light Scattering
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Cited by 1 •
2016
A photo-thermal angular light scattering (PT-AS) sensor enables the rapid and chemical-free hemoglobin assay of nanoliter-scale blood samples. Here, details of the PT-AS setup and a measurement protocol for the hemoglobin concentration in blood are provided. Representative results for anemic blood samples are also presented.
04:51
Modeling Neonatal Intraventricular Hemorrhage Through Intraventricular Injection of Hemoglobin
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2025
This video demonstrates a method to generate a rat model of neonatal intraventricular hemorrhage. In this procedure, an anesthetized rat pup is injected with hemoglobin into the lateral ventricle of the brain. The hemoglobin causes oxidative stress and releases heme, simulating intraventricular hemorrhage. The resulting damage to brain tissues, driven by reactive oxygen species and inflammatory cytokines, leads to ventricular enlargement, a common consequence of intraventricular hemorrhage.
03:11
Oxidation-Reduction Reactions
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2020
Oxidation–Reduction Reactions Earth’s atmosphere contains about 20% molecular oxygen, O2, a chemically reactive gas that plays an essential role in the metabolism of aerobic organisms and in many environmental processes that shape the world. The term oxidation was originally used to describe chemical reactions involving O2, but its meaning has evolved to refer to a broad and important reaction class known as oxidation–reduction (redox) reactions. Some redox reactions involve the transfer of...
FAQs
Lowering HbS reduces the concentration of sickling-prone hemoglobin available to polymerize during deoxygenation. This makes deoxygenation-dependent polymerization less likely to drive red blood cell damage and vascular complications. The mechanistic value of tracking HbS reduction is that it links a measurable laboratory change with reduced sickling-related stress.
Donor red blood cells provide normal adult hemoglobin while HbS-containing red blood cells are removed or diluted. This changes the hemoglobin mixture circulating in the patient, rather than relying only on a change within existing cells. The intended result is a lower HbS percentage and less red blood cell injury, supporting clinical strategies aimed at vascular protection.
Automated erythrocytapheresis specifically removes HbS-containing red blood cells and replaces them with donor cells containing normal adult hemoglobin. Red blood cell transfusion likewise introduces donor cells to lower the proportion of HbS in circulation, but the two approaches differ in how cells are exchanged. This distinction helps clinicians select an approach within an individualized transfusion plan.
HbS percentages provide a measurable way to assess treatment response. Clinicians can compare the observed proportion of HbS with the transfusion targets selected for the patient, then use that information to guide ongoing care. Because targets are individualized, the measurement supports adjustment of management while preserving an individualized approach to long-term planning.
The care plan begins with selecting red blood cell transfusion or automated erythrocytapheresis, depending on the individualized strategy. Donor cells containing normal adult hemoglobin are then supplied, while automated erythrocytapheresis removes HbS-containing cells. Clinicians monitor the resulting HbS percentage and use it to assess response and guide transfusion targets over time.
In medicine, this strategy is relevant to care focused on stroke, acute chest syndrome, and severe anemia, because these are complications identified as prevention or management targets. HbS reduction can therefore be incorporated into complication-focused care and longer-term planning, with laboratory monitoring helping clinicians evaluate whether the chosen transfusion approach is meeting its intended goal.