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Osteoblasts promote castration-resistant prostate cancer by altering intratumoral steroidogenesis.

Artikel i vetenskaplig tidskrift
Författare Malin Hagberg Thulin
Maria E. Nilsson
Pontus Thulin
Jocelyn Céraline
Claes Ohlsson
Jan-Erik Damber
Karin Welén
Publicerad i Molecular and cellular endocrinology
Volym 422
Sidor 182–191
ISSN 1872-8057
Publiceringsår 2016
Publicerad vid Institutionen för kliniska vetenskaper, Avdelningen för urologi
Centre for Bone and Arthritis Research
Institutionen för medicin, avdelningen för invärtesmedicin och klinisk nutrition
Sidor 182–191
Språk en
Länkar dx.doi.org/10.1016/j.mce.2015.11.01...
Ämnesord Castration-resistant prostate cancer; Osteoblasts; Steroidogenesis; Androgen receptor; Bone metastases
Ämneskategorier Cancer och onkologi, Endokrinologi, Urologi och njurmedicin

Sammanfattning

The skeleton is the preferred site for prostate cancer (PC) metastasis leading to incurable castration-resistant disease. The increased expression of genes encoding steroidogenic enzymes found in bone metastatic tissue from patients suggests that up-regulated steroidogenesis might contribute to tumor growth at the metastatic site. Because of the overall sclerotic phenotype, we hypothesize that osteoblasts regulate the intratumoral steroidogenesis of castration resistant prostate cancer (CRPC) in bone. We here show that osteoblasts alter the steroidogenic transcription program in CRPC cells, closely mimicking the gene expression pattern described in CRPC. Osteoblast-stimulated LNCaP-19 cells displayed an increased expression of genes encoding for steroidogenic enzymes (CYP11A1, HSD3B1, and AKR1C3), estrogen signaling-related genes (CYP19A1, and ESR2), and genes for DHT-inactivating enzymes (UGT2B7, UGT2B15, and UGT2B17). The observed osteoblast-induced effect was exclusive to osteogenic CRPC cells (LNCaP-19) in contrast to osteolytic PC-3 and androgen-dependent LNCaP cells. The altered steroid enzymatic pattern was specific for the intratibial tumors and verified by immunohistochemistry in tissue specimens from LNCaP-19 xenograft tumors. Additionally, the overall steroidogenic effect was reflected by corresponding levels of progesterone and testosterone in serum from castrated mice with intratibial xenografts. A bi-directional interplay was demonstrated since both proliferation and Esr2 expression of osteoblasts were induced by CRPC cells in steroid-depleted conditions. Together, our results demonstrate that osteoblasts are important mediators of the intratumoral steroidogenesis of CRPC and for castration-resistant growth in bone. Targeting osteoblasts may therefore be important in the development of new therapeutic approaches.

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Utskriftsdatum: 2020-04-06