What question did this study set out to answer?

Investigate the molecular mechanisms preventing tumor-associated macrophages from killing high-grade B cell lymphoma cells and determine whether vitamin D signaling can restore antitumor cytotoxicity.

April 8, 2015Science Translational Medicine

Vitamin D–dependent induction of cathelicidin in human macrophages results in cytotoxicity against high-grade B cell lymphoma

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Investigate the molecular mechanisms preventing tumor-associated macrophages from killing high-grade B cell lymphoma cells and determine whether vitamin D signaling can restore antitumor cytotoxicity.
Compared cytotoxic activity and vitamin D metabolism between inflammatory M1 macrophages, anti-inflammatory M2 macrophages, and primary tumor-associated macrophages from Burkitt's lymphoma.
Tested the effects of bioactive vitamin D (1,25D3) and vitamin D receptor agonists on cathelicidin induction, mitochondrial disruption, and rituximab-mediated cytotoxicity in vitro.
Administered vitamin D supplementation to 25-hydroxyvitamin D-deficient human volunteers in vivo and evaluated antibody-dependent cellular cytotoxicity against lymphoma cells.
Inflammatory M1 macrophages selectively killed lymphoma cells via vitamin D-dependent secretion of cathelicidin, which targeted and disrupted tumor cell mitochondria.
M2 macrophages and primary tumor-associated macrophages showed defective vitamin D metabolism and low cathelicidin levels, but treatment with 1,25D3 or receptor agonists restored tumoricidal function.
Vitamin D treatment in 25-hydroxyvitamin D-deficient volunteers in vivo and primary tumor-associated macrophages in vitro significantly enhanced rituximab-mediated antibody-dependent cellular cytotoxicity.

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Implication

Translational study reveals vitamin D–induced cathelicidin drives macrophage cytotoxicity against high-grade B cell lymphoma, indicating a pathway to enhance rituximab efficacy.

Cite This Study

Bruns et al. (2015) studied this question.

synapsesocial.com/papers/6a9547029f3a8012a37cfc74 https://doi.org/10.1126/scitranslmed.aaa3230

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Implication

Translational study reveals vitamin D–induced cathelicidin drives macrophage cytotoxicity against high-grade B cell lymphoma, indicating a pathway to enhance rituximab efficacy.

Vitamin D–dependent induction of cathelicidin in human macrophages results in cytotoxicity against high-grade B cell lymphoma

Key Points

Discussion

Implication

Cite This Study

Vitamin D–dependent induction of cathelicidin in human macrophages results in cytotoxicity against high-grade B cell lymphoma

Key Points

Discussion

Implication

Cite This Study

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