A novel anemia associated with membranous cytoplasm degeneration in 16 patients: an ultrastructural study

Area of Science:

• Hematology
• Cell Biology
• Pathology

Background:

• Mild anemia and hemolysis cases often pose diagnostic challenges with standard laboratory tests and light microscopy.
• Classifying these patients into known anemia categories can be difficult, hindering understanding of their underlying pathomechanisms.

Purpose of the Study:

• To perform a detailed ultrastructural study of erythroid cells in 16 patients with unexplained anemia and hemolysis.
• To investigate the pathomechanism of anemia and hemolysis in these patients.
• To explore the potential for a novel anemia classification based on cellular morphology.

Main Methods:

• Transmission electron microscopy (TEM) was employed to examine erythroid cells (erythroblasts and reticulocytes) from 16 patients.
• Detailed ultrastructural analysis focused on cytoplasmic and nuclear alterations.

Main Results:

• TEM revealed significant cytoplasmic alterations, including sequestration, membranous transformation, and degeneration in erythroblasts and reticulocytes.
• Affected erythroblasts exhibited nuclear abnormalities such as chromatin condensation, karyorrhexis, nuclear membrane lysis, and megaloblastic changes.
• Reticulocytes displayed large sizes (10-15 µm) and unique membranous cytoplasmic degeneration, indicating dyserythropoiesis and ineffective erythropoiesis.

Conclusions:

• Membranous cytoplasm degeneration represents a unique pathomechanism in these patients.
• The observed ultrastructural changes suggest a novel category of anemia.
• Further investigation is warranted to fully characterize this anemia and its pathomechanism.