Related Experiment Video
Updated: Nov 7, 2025
Isolation of Leukocytes from the Murine Tissues at the Maternal-Fetal Interface
Published on: May 21, 2015
Hyporegenerative anemia in anti-M-associated hemolytic disease of the fetus
Si Li1,2, Zhiming He2, Chunyan Mo3
1Department of Obstetrics, the Sixth Affiliated Hospital of Sun Yat-sen University, Guangzhou, China.
Background:
The anti-M antibody can lead to hemolytic disease of the fetus and newborn (HDFN) and adverse fetal outcomes, especially in the Asian population. However, fetal erythropoiesis resulting from M alloimmunization needs further investigation.
Study Design And Methods:
We analyzed erythropoiesis in eight fetuses with M alloimmunization and compared them with the fetuses affected by anti-D. They were matched as pairs according to the gestational age of diagnosis and the hematocrit before treatment. Paired t-tests or paired Wilcoxon rank-sum tests were conducted to compare the difference in the cord blood indexes. Pearson correlation analysis was used to evaluate the correlativity between hematocrit and the reticulocyte percentage in the two groups.
Results:
The fetuses in the MN group had lower reticulocyte count and percentage than those in the RhD group (p < .05). All of the fetal reticulocyte production indexes (RPIs) in the MN group were less than 2, indicating an inadequate hemopoietic response to anemia, while the majority of the RPIs in the RhD group (85.7%) were significantly higher (p = .003), with 6 cases greater than 2.5. Hematocrit was negatively correlated with reticulocyte percentage (y = 54.7-171.7x, r2 = 0.825, p = .005) in the RhD group, while no significant correlation was found in the MN group. No difference in the number of IUT, interval, or the fetal outcome was found between the two groups.
Conclusion:
Fetal reticulocytopenia provided direct evidence of an inadequate hemopoietic response in HDFN due to anti-M, leading to hyporegenerative anemia. Once the IgG component of anti-M is detected, close monitoring should be considered.
Insights
Fetuses with anti-M alloimmunization show inadequate erythropoiesis, leading to hyporegenerative anemia. Close monitoring is crucial once anti-M IgG is detected to manage hemolytic disease of the fetus and newborn (HDFN).
Area of Science:
- Perinatal immunology
- Fetal hematology
- Immunogenetics
Background:
- Anti-M alloimmunization can cause hemolytic disease of the fetus and newborn (HDFN), particularly in Asian populations.
- Fetal erythropoiesis in M alloimmunization requires further investigation.
Purpose of the Study:
- To investigate and compare fetal erythropoiesis in cases of M alloimmunization versus RhD alloimmunization.
- To assess the hemopoietic response to anemia in fetuses affected by anti-M antibodies.
Main Methods:
- Analysis of erythropoiesis in eight fetuses with M alloimmunization, compared to RhD-alloimmunized fetuses.
- Paired analysis based on gestational age and pre-treatment hematocrit.
- Comparison of cord blood indexes and correlation analysis between hematocrit and reticulocyte percentage.
Main Results:
- Fetuses with M alloimmunization exhibited lower reticulocyte counts and percentages compared to the RhD group.
- Reticulocyte production indexes (RPIs) were below 2 in the M alloimmunization group, indicating inadequate response.
- A negative correlation between hematocrit and reticulocyte percentage was observed in the RhD group, but not in the M alloimmunization group.
Conclusions:
- Fetal reticulocytopenia in anti-M HDFN signifies a hyporegenerative anemia due to inadequate hemopoietic response.
- Close monitoring is recommended upon detection of anti-M IgG to manage potential adverse fetal outcomes.
More Related Videos
11:59Detection of Residual Donor Erythroid Progenitor Cells after Hematopoietic Stem Cell Transplantation for Patients with Hemoglobinopathies
Published on: September 6, 2017
11:31Antigens Protected Functional Red Blood Cells By The Membrane Grafting Of Compact Hyperbranched Polyglycerols
Published on: January 2, 2013
Related Concept Videos
01:19Rh Blood Group
01:22Development of Immunocompetence
The initial cells that migrate from the fetal thymus settle within the skin and epithelial tissues lining the mouth, digestive tract, and in females, the uterus and vagina. These cells, including skin-based dendritic cells, serve as antigen-presenting cells, playing a key role in T cell activation.
Subsequent T...
01:27Disorders of Erythrocytes
Erythrocyte disorders can be broadly categorized into two main types: anemic and polycythemic conditions.
A low oxygen-carrying capacity of the blood due to the loss, lower production, or destruction of erythrocytes is termed anemia. Hemorrhagic anemia, for example, occurs when bleeding from an external wound or internal ulcer reduces erythrocyte counts.
On the other...
01:15Transcytosis of IgG
IgG molecules from a mother undergo transcytosis starting around 13 weeks of gestation. The amount of IgG transferred and entering the fetal blood circulation increases with...
01:15Blood Transfusion
Blood Transfusion Overview
A blood transfusion is a medical procedure used to replace blood lost due to injury, surgery, or to treat conditions such as anemia or cancer. During a transfusion, donor blood is...
02:45Blood Transfusion and Agglutination
History
The history of blood transfusion dates back to the 17th century, when early attempts were made in animals. In 1818 James Blundell, a British doctor, performed the first successful human blood transfusion. Later in 1900, Karl...