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Macrophage Differentiation and Polarization into an M2-Like Phenotype using a Human Monocyte-Like THP-1 Leukemia Cell Line

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p53 is a regulator of macrophage differentiation

D Matas¹, M Milyavsky, I Shats

¹Department of Molecular Cell Biology, The Weizmann Institute of Science, Rehovot, Israel.

Cell Death and Differentiation

|January 10, 2004

Abstract:

While it is well accepted that p53 plays a role in apoptosis, less is known as to its involvement in cell differentiation. Here we show that wild-type p53 facilitates IL-6-dependent macrophage differentiation. Treatment of M1/2 cells expressing the temperature-sensitive p53 143 (Val to Ala) mutant, at the wild-type conformation, facilitated the appearance of mature macrophages that exhibited phagocytic activity. Enhancement of differentiation by the p53 143 (Val to Ala) in the wild-type conformation was coupled with the inhibition of apoptosis induction by this protein. In agreement with previous studies, we found that p53 levels were reduced during p53-dependent macrophage differentiation. This occurred when p53 levels before IL-6 stimuli were high. Interestingly, the p53 143 (Val to Ala) protein, at the mutant conformation, enhanced macrophage differentiation, as did the wild-type conformation, whereas the p53 273 (Arg to His) core mutant exerted an inhibitory effect on this pathway. The transcription-deficient p53 molecules, p53 (22-23) and p53 22,23,143, could not induce p53-dependent differentiation. Moreover, the p53 (22-23) protein inhibited the p53-independent differentiation pathway. Interestingly, the p53 (22-23) protein not only blocked IL-6-mediated differentiation, but also induced significant apoptotic cell death, upon IL-6 stimulation. Taken together, our data show that wild-type p53 enhances macrophage differentiation, while various p53 mutant types exert different effects on this differentiation pathway.

Insights

Wild-type p53 promotes macrophage differentiation, while specific p53 mutants have varied effects on this process and apoptosis. Understanding p53

Area of Science:

Molecular Biology
Cell Biology
Immunology

Background:

The tumor suppressor protein p53 is primarily known for its role in apoptosis.
Its involvement in cell differentiation, particularly macrophage differentiation, is less understood.
Interleukin-6 (IL-6) is a key cytokine in macrophage differentiation.

Purpose of the Study:

To investigate the role of wild-type and mutant p53 in IL-6-dependent macrophage differentiation.
To elucidate how different p53 conformations and mutations affect macrophage differentiation and apoptosis.

Main Methods:

Utilized M1/2 cells expressing temperature-sensitive p53 mutants (p53 143 Val to Ala, p53 273 Arg to His).
Examined the effects of wild-type and mutant p53 conformations on macrophage differentiation and phagocytic activity.
Assessed p53 levels during differentiation and analyzed the impact of transcription-deficient p53 mutants (p53 22-23, p53 22,23,143).

Main Results:

Wild-type p53, and the p53 143 (Val to Ala) mutant in its wild-type conformation, enhanced IL-6-dependent macrophage differentiation.
The p53 143 (Val to Ala) mutant also inhibited apoptosis induction, while the p53 273 (Arg to His) mutant inhibited differentiation.
Transcription-deficient p53 mutants (p53 22-23, p53 22,23,143) failed to induce differentiation and inhibited IL-6-mediated pathways, with p53 (22-23) inducing apoptosis.

Conclusions:

Wild-type p53 plays a crucial role in facilitating IL-6-dependent macrophage differentiation.
Specific p53 mutations and conformations differentially regulate macrophage differentiation and apoptosis.
The transcriptional activity of p53 is essential for its role in promoting macrophage differentiation.

Read full analysis

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