Properdin is a modulator of tumour immunity in a syngeneic mouse melanoma model

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Background and Objectives: Tumours are often low immunogenic. The role of complement, an innate immune defence system, in tumour control has begun to be elucidated, but findings are conflicting. A role for properdin, an amplifier of complement activation, in tumour control has recently been implicated. Materials and Methods: Properdin-deficient and congenic wildtype mice were injected subcutaneously with B16F10 melanoma cells. Tumour mass and chemokine profile were assessed. The frequencies of CD45+CD11b+ Gr-1+ cells were determined from tumours and spleens, and CD206+ F4/80+ cells were evaluated in spleens. Sera were analysed for C5a, sC5b-9, and CCL2. Results: Whilst there was no difference in tumour growth at study endpoint, properdin-deficient mice had significantly fewer myeloid-derived suppressor cells (MDSCs) in their tumours and spleens. Splenic M2 type macrophages and serum levels of C5a, sC5b-9, and CCL2 were decreased in properdin-deficient compared to wildtype mice. Conclusions: The presence of intact complement amplification sustains an environment that lessens potential anti-tumour responses.

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Al-Rayahi, I. A. M., Machado, L. R., & Stover, C. M. (2021). Properdin is a modulator of tumour immunity in a syngeneic mouse melanoma model. Medicina (Lithuania), 57(2), 1–8.

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