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@ARTICLE{Prakash:130352,
author = {H. Prakash$^*$ and F. Klug$^*$ and V. Nadella and V.
Mazumdar and H. Schmitz-Winnenthal and L. Umansky},
title = {{L}ow doses of gamma irradiation potentially modifies
immunosuppressive tumor microenvironment by retuning
tumor-associated macrophages: lesson from insulinoma.},
journal = {Carcinogenesis},
volume = {37},
number = {3},
issn = {1460-2180},
address = {Oxford},
publisher = {Oxford Univ. Press},
reportid = {DKFZ-2017-05431},
pages = {301 - 313},
year = {2016},
abstract = {Tumor infiltrating iNOS+ macrophages under the influence of
immunosuppressive tumor microenvironment gets polarized to
tumor-promoting and immunosuppressive macrophages, known as
tumor-associated macrophages (TAM). Their recruitment and
increased density in the plethora of tumors has been
associated with poor prognosis in cancer patients.
Therefore, retuning of TAM to M1 phenotype would be a key
for effective immunotherapy. Radiotherapy has been a
potential non-invasive strategy to improve cancer
immunotherapy and tumor immune rejection. Irradiation of
late-stage tumor-bearing Rip1-Tag5 mice twice with 2 Gy dose
resulted in profound changes in the inflammatory tumor
micromilieu, characterized by induction of M1-associated
effecter cytokines as well as reduction in protumorigenic
and M2-associated effecter cytokines. Similarly, in vitro
irradiation of macrophages with 2 Gy dose-induced expression
of iNOS, NO, NFκBpp65, pSTAT3 and proinflammatory cytokines
secretion while downregulating p38MAPK which are involved in
iNOS translation and acquisition of an M1-like phenotype.
Enhancement of various M2 effecter cytokines and angiogenic
reprogramming in iNOs+ macrophage depleted tumors and their
subsequent reduction by 2 Gy dose in Rip1-Tag5 transgenic
mice furthermore demonstrated a critical role of peritumoral
macrophages in the course of gamma irradiation mediated M1
retuning of insulinoma.},
keywords = {Cytokines (NLM Chemicals)},
cin = {G808},
ddc = {610},
cid = {I:(DE-He78)G808-20160331},
pnm = {317 - Translational cancer research (POF3-317)},
pid = {G:(DE-HGF)POF3-317},
typ = {PUB:(DE-HGF)16},
pubmed = {pmid:26785731},
doi = {10.1093/carcin/bgw007},
url = {https://inrepo02.dkfz.de/record/130352},
}