Effects of interleukin-3 injection on supraventricular amoeboid microglial cells in neonatal BALB/c and athymic mice
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Published on: January 30, 2014
W W Htain1, S K Leong, E A Ling
1Department of Anatomy, Faculty of Medicine, National University of Singapore, Singapore.
Abstract:
The present study investigated the effects of interleukin-3 (IL-3) on supraventricular amoeboid microglial cells (SAMC) of neonatal BALB/c and athymic mice. After four consecutive daily intraperitoneal injections of IL-3 at the age of 1 day postnatum and perfusion at the age of 5 days, BALB/c and athymic mice showed a 20% and 37% increase, respectively, in the number of Mac-1 positive SAMC. In mice receiving seven successive injections of IL-3 and perfused at the age of 8 days postnatum, Mac-1 labelled SAMC were increased by 14% and 19%, respectively. The increased number of SAMC could be the result of cytokine stimulation of their progenitor cells, viz., the stem cells of bone marrow or monocytes, or the result of direct stimulation of the SAMC themselves.
Insights
Interleukin-3 (IL-3) significantly increased supraventricular amoeboid microglial cells (SAMC) in neonatal mice. This suggests IL-3 may stimulate SAMC development or directly impact these immune cells.
Area of Science:
- Neuroimmunology
- Developmental Biology
- Hematology
Background:
- Microglia are the primary immune cells of the central nervous system.
- Supraventricular amoeboid microglial cells (SAMC) are a distinct subtype found in neonatal rodents.
- Interleukin-3 (IL-3) is a cytokine known to influence hematopoiesis and immune cell development.
Purpose of the Study:
- To investigate the effect of IL-3 on the proliferation and presence of SAMC in neonatal mice.
- To determine if IL-3 influences Mac-1 positive SAMC populations in BALB/c and athymic mice.
Main Methods:
- Neonatal BALB/c and athymic mice received daily intraperitoneal injections of IL-3.
- Mice were perfused at different time points (5 and 8 days postnatum) after IL-3 administration.
- The number of Mac-1 positive SAMC was quantified using immunohistochemistry.
Main Results:
- IL-3 administration led to a significant increase in Mac-1 positive SAMC in both BALB/c (20%) and athymic (37%) mice after 4 days.
- A prolonged IL-3 treatment (7 days) also showed increased SAMC counts (14% and 19% respectively).
- Athymic mice exhibited a more pronounced response to IL-3 compared to BALB/c mice.
Conclusions:
- IL-3 administration promotes the expansion of SAMC populations in neonatal mice.
- The observed increase in SAMC may result from the stimulation of progenitor cells (bone marrow stem cells or monocytes) or direct effects on SAMC.
- These findings highlight IL-3's role in regulating microglial development and immune cell dynamics during early life.
