Nicotine Synergizes with High-Fat Diet to Induce an Anti-Inflammatory Microenvironment to Promote Breast Tumor Growth

Joint Authors

Singh, Rajan
Vadgama, Jaydutt
Sinha, Satyesh
Jimenez, Thalia
Friedman, Theodore
Tucker, Alexandria
Collazo, Javier
Hikim, Amiya Sinha
Pervin, Shehla
Singh, Vineeta

Source

Mediators of Inflammation

Issue

Vol. 2020, Issue 2020 (31 Dec. 2020), pp.1-17, 17 p.

Publisher

Hindawi Publishing Corporation

Publication Date

2020-12-14

Country of Publication

Egypt

No. of Pages

17

Main Subjects

Diseases

Abstract EN

Breast cancer results from a complex interplay of genetics and environment that alters immune and inflammatory systems to promote tumorigenesis.

Obesity and cigarette smoking are well-known risk factors associated breast cancer development.

Nicotine known to decrease inflammatory signals also modulates immune responses that favor breast cancer development.

However, the mechanisms by which nicotine and obesity contribute to breast cancer remain poorly understood.

In this study, we examined potential mechanisms by which nicotine (NIC) and high-fat diet (HFD) promote growth of HCC70 and HCC1806 xenografts from African American (AA) triple negative (TN) breast cancer cells.

Immunodeficient mice fed on HFD and treated with NIC generated larger HCC70 and HCC1806 tumors when compared to NIC or HFD alone.

Increased xenograft growth in the presence of NIC and HFD was accompanied by higher levels of tissue-resident macrophage markers and anti-inflammatory cytokines including IL4, IL13, and IL10.

We further validated the involvement of these players by in vitro and ex vivo experiments.

We found a proinflammatory milieu with increased expression of IL6 and IL12 in xenografts with HFD.

In addition, nicotine or nicotine plus HFD increased a subset of mammary cancer stem cells (MCSCs) and key adipose browning markers CD137 and TMEM26.

Interestingly, there was upregulation of stress-induced pp38 MAPK and pERK1/2 in xenografts exposed to HFD alone or nicotine plus HFD.

Scratch-wound assay showed marked reduction in proliferation/migration of nicotine and palmitate-treated breast cancer cells with mecamylamine (MEC), a nicotine acetylcholine receptor (nAchR) antagonist.

Furthermore, xenograft development in immune-deficient mice, fed HFD plus nicotine, was reduced upon cotreatment with MEC and SB 203580, a pp38MAPK inhibitor.

Our study demonstrates the presence of nicotine and HFD in facilitating an anti-inflammatory tumor microenvironment that influences breast tumor growth.

This study also shows potential efficacy of combination therapy in obese breast cancer patients who smoke.

American Psychological Association (APA)

Jimenez, Thalia& Friedman, Theodore& Vadgama, Jaydutt& Singh, Vineeta& Tucker, Alexandria& Collazo, Javier…[et al.]. 2020. Nicotine Synergizes with High-Fat Diet to Induce an Anti-Inflammatory Microenvironment to Promote Breast Tumor Growth. Mediators of Inflammation،Vol. 2020, no. 2020, pp.1-17.
https://search.emarefa.net/detail/BIM-1191808

Modern Language Association (MLA)

Jimenez, Thalia…[et al.]. Nicotine Synergizes with High-Fat Diet to Induce an Anti-Inflammatory Microenvironment to Promote Breast Tumor Growth. Mediators of Inflammation No. 2020 (2020), pp.1-17.
https://search.emarefa.net/detail/BIM-1191808

American Medical Association (AMA)

Jimenez, Thalia& Friedman, Theodore& Vadgama, Jaydutt& Singh, Vineeta& Tucker, Alexandria& Collazo, Javier…[et al.]. Nicotine Synergizes with High-Fat Diet to Induce an Anti-Inflammatory Microenvironment to Promote Breast Tumor Growth. Mediators of Inflammation. 2020. Vol. 2020, no. 2020, pp.1-17.
https://search.emarefa.net/detail/BIM-1191808

Data Type

Journal Articles

Language

English

Notes

Includes bibliographical references

Record ID

BIM-1191808