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Updated: Sep 21, 2026
Bone Marrow-derived Macrophage Production
Published on: November 22, 2013
Macrophages: important accessory cells for reproductive function
P E Cohen1, K Nishimura, L Zhu
1Department of Developmental and Molecular Biology, Albert Einstein College of Medicine, Bronx, New York 10461, USA.
Abstract:
Macrophages are found throughout reproductive tissues. To determine their role(s), we have studied mice homozygous for a null mutation (Csfm(op)) in the gene encoding the major macrophage growth factor, colony-stimulating factor-1 (CSF-1). Both male and female Csfm(op)/Csfm(op) mice have fertility defects. Males have low sperm number and libido as a consequence of dramatically reduced circulating testosterone. Females have extended estrous cycles and poor ovulation rates. CSF-1 is the principal growth factor regulating macrophage populations in the testis, male accessory glands, ovary, and uterus. However, analyses of CSF-1 nullizygous mice suggest that the primary reproductive defect is in the development of feedback regulation of the hypothalamic-pituitary axis. Although not correlating with deficiencies of microglia populations, electrophysiological investigations indicate an impairment of neuronal responses. This suggests that microglia, under the influence of CSF-1, act to organize neuronal connectivity during development and that the absence of this function results in a perturbation of the hypothalamic-pituitary-gonadal axis. Macrophages also appear to have functions in the differentiated tissues of the reproductive system, including having a positive influence on steroidogenic cells. These data suggest that macrophages, through their trophic functions, can be considered as essential accessory cells for normal reproductive functioning.
Insights
Colony-stimulating factor-1 (CSF-1) is crucial for macrophage development and reproductive health. Mice lacking CSF-1 show fertility defects due to impaired hypothalamic-pituitary axis regulation and neuronal function.
Area of Science:
- Reproductive biology
- Immunology
- Neuroendocrinology
Background:
- Macrophages are present in reproductive tissues and are regulated by colony-stimulating factor-1 (CSF-1).
- The specific roles of macrophages and CSF-1 in reproduction are not fully understood.
- CSF-1 is essential for macrophage development and function.
Purpose of the Study:
- To investigate the role of CSF-1 and macrophages in male and female reproductive function.
- To determine the impact of CSF-1 deficiency on the hypothalamic-pituitary axis and neuronal activity.
- To elucidate the contribution of macrophages to reproductive tissue physiology.
Main Methods:
- Studied mice homozygous for a null mutation in the CSF-1 gene (Csfm(op)/Csfm(op)).
- Assessed fertility, sperm parameters, libido, estrous cycles, and ovulation rates.
- Performed electrophysiological investigations to evaluate neuronal responses.
- Analyzed macrophage populations in reproductive organs.
Main Results:
- Csfm(op)/Csfm(op) mice exhibited significant fertility defects in both males and females.
- Males showed low sperm count and libido linked to reduced testosterone.
- Females displayed extended estrous cycles and poor ovulation.
- CSF-1 deficiency impaired hypothalamic-pituitary axis feedback regulation and neuronal function, affecting the hypothalamic-pituitary-gonadal axis.
- Macrophages positively influence steroidogenic cells in reproductive tissues.
Conclusions:
- CSF-1 is essential for maintaining macrophage populations critical for normal reproductive functioning.
- Macrophages, regulated by CSF-1, play a vital role in the development and organization of neuronal connectivity, particularly within the hypothalamic-pituitary axis.
- These findings highlight macrophages as essential accessory cells for reproductive health through their trophic functions.
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