Equine bone marrow: a quantitative analysis of erythroid maturation.

Equine bone marrow is evaluated in light of blood loss response, focusing on the maturation of erythroid (red blood cells) via intricate processes and stages.

Overview of the Study

• This study explores how equine bone marrow responds to blood loss, particularly their enhancement of erythropoiesis or the production of erythroids, which are red blood cells. The study focuses on the maturation and release of reticulocytes, a type of erythroid that the marrow only releases into the peripheral circulation in cases of severe chronic anemia.

Methodology and Analysis

• Researchers performed an in-depth morphometric analysis based on electron microscopy of the equine marrow to examine the development and release of these reticulocytes.
• The developing red cells in the bone marrow of normal and chronically anemic horses were classified into four stages for analysis: the early, intermediate, and late-stage erythroblasts as well as reticulocytes.
• The analysis for each stage looked at the volume density of mitochondria per micron cube of cytoplasm, the surface area of the outer mitochondrial membrane per unit volume of mitochondria, and the number of ribosomes per unit volume of cytoplasm.

Findings

• The study found that matched t-tests between normal and anemic animals showed significant differences with P less than or equal to .001 for volume density of mitochondria and numbers of ribosomes, but only at the reticulocyte stage.
• This suggests that the significant differences in volumes of mitochondria and number of ribosomes in normal and anemic horses are vital predictors of the reticulocytes stage.
• Moreover, researchers proposed that the production and release of large reticulocytes in chronic anemia cases may be best explained by a skipped mitotic division, which indicates an abnormal cell division process that might lead to the production of larger cells.