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Updated: Jul 8, 2026
Investigation of Macrophage Polarization Using Bone Marrow Derived Macrophages
Published on: June 23, 2013
Low-dose cadmium telluride quantum dots trigger M1 polarization in macrophages through mTOR-mediated transcription
Tingting Wei1, Na Liu1, Yongshuai Yao1
1Key Laboratory of Environmental Medicine and Engineering, Ministry of Education; School of Public Health, Southeast University, Nanjing 210009, PR China.
Abstract:
The increasing application of quantum dots (QDs) increases interactions with organisms. The inflammatory imbalance is a significant manifestation of immunotoxicity. Macrophages maintain inflammatory homeostasis. Using macrophages differentiated by phorbol 12-myristate 13-acetate-induced THP-1 cells as models, the study found that low-dose (5 μM) cadmium telluride QDs (CdTe-QDs) hindered monocyte-macrophage differentiation. CD11b is a surface marker of macrophage, and the addition of CdTe-QDs during induction resulted in a decrease in CD11b expression. Moreover, exposure of differentiated THP-1 macrophage (dTHP-1) to 5 μM CdTe-QDs led to the initiation of M1 polarization. This was indicated by the increased surface marker CD86 expression, along with elevated level of NF-κB and IL-1β proteins. The potential mechanisms are being explored. The transcription factor EB (TFEB) plays a significant role in immune regulation and serves as a crucial regulator of the autophagic lysosomal pathway. After exposed to CdTe-QDs, TFEB activation-mediated autophagy and M1 polarization were observed to occur simultaneously in dTHP-1. The mTOR signaling pathway contributed to TFEB activation induced by CdTe-QDs. However, mTOR-independent activation of TFEB failed to promote M1 polarization. These results suggest that mTOR-TFEB is an advantageous target to enhance the biocompatibility of CdTe-QDs.
Insights
Low-dose cadmium telluride quantum dots (CdTe-QDs) impair macrophage differentiation and promote M1 polarization. Targeting the mTOR-TFEB pathway may improve CdTe-QD biocompatibility for safer applications.
Area of Science:
- Nanotechnology
- Immunotoxicology
- Cell Biology
Background:
- Quantum dots (QDs) are increasingly used, raising concerns about their interactions with biological systems.
- Immunotoxicity, particularly inflammatory imbalance, is a key concern with nanomaterial exposure.
- Macrophages are critical for maintaining inflammatory homeostasis.
Purpose of the Study:
- To investigate the immunotoxic effects of cadmium telluride quantum dots (CdTe-QDs) on macrophages.
- To elucidate the mechanisms underlying CdTe-QD-induced inflammatory responses.
- To identify potential pathways for improving CdTe-QD biocompatibility.
Main Methods:
- Utilized phorbol 12-myristate 13-acetate-induced THP-1 cells differentiated into macrophages.
- Assessed monocyte-macrophage differentiation by monitoring CD11b expression.
- Analyzed M1 polarization markers (CD86, NF-κB, IL-1β) and investigated the role of transcription factor EB (TFEB) and mTOR signaling.
Main Results:
- Low-dose (5 μM) CdTe-QDs hindered monocyte-macrophage differentiation, indicated by decreased CD11b expression.
- CdTe-QD exposure induced M1 polarization in differentiated macrophages, evidenced by increased CD86, NF-κB, and IL-1β.
- CdTe-QD-induced M1 polarization was mediated by mTOR-dependent TFEB activation and subsequent autophagy.
Conclusions:
- CdTe-QDs can induce immunotoxicity by impairing macrophage differentiation and promoting pro-inflammatory M1 polarization.
- The mTOR-TFEB signaling pathway is crucial for CdTe-QD-induced M1 polarization.
- Targeting the mTOR-TFEB pathway presents a promising strategy to enhance the biocompatibility of CdTe-QDs.
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