KDM2A-dependent reduction of rRNA transcription on glucose starvation requires HP1 in cells, including triple-negative breast cancer cells.

In this study, we turned our attention to the nucleolar accumulation of KDM2A. We found that KDM2A had multiple regions for its nucleolar localization, and one of the regions was directly bound by heterochromatin protein 1γ (HP1γ) using valine 801 in the LxVxL motif of KDM2A. A knockdown of HP1γ or a point mutation of valine 801 in KDM2A decreased the nucleolar accumulation of KDM2A, and suppressed the reduction of rRNA transcription on glucose starvation. These results uncovered a novel function of HP1γ: the regulation of rRNA transcription, and suggested that HP1γ stimulates the nucleolar accumulation of KDM2A to support the KDM2A-dependent regulation of rRNA transcription. HP1γ was expressed in cancer cells in all breast carcinoma tissues examined, including TNBC tissues. A knockdown of HP1γ in a TNBC cell line, MDA-MB-231 cells, reduced the nucleolar accumulation of KDM2A, and suppressed the reductions of rRNA transcription and cell proliferation on glucose starvation. These results suggest that the KDM2A-dependent regulation of rRNA transcription requires HP1γ, and thus may be applicable to the treatment of TNBC. PMID: 31413816 [PubMed]
Source: Oncotarget - Category: Cancer & Oncology Tags: Oncotarget Source Type: research

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Publication date: Available online 17 September 2019Source: SteroidsAuthor(s): Anjali Verma, Nofrat Schwartz, D. Joshua Cohen, Barbara D. Boyan, Zvi SchwartzAbstractLaryngeal squamous cell carcinoma (LSCC) has been shown to respond to 17β-estradiol. However, the presence and characterization of estrogen receptors (ER) and other sex hormone receptors in LSCC are still being determined. Sex hormone receptors and the way sex hormones impact LSCC tumors are important for understanding which patients would benefit from hormone therapies, such as anti-estrogen therapies. This information also has prognostic value, as there ...
Source: Steroids - Category: Drugs & Pharmacology Source Type: research
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Source: Cancer Genetics - Category: Cancer & Oncology Source Type: research
This 61-year-old woman presented with new primary triple negative breast cancer (TNBC) in the lateral breast 10 years after completing radiation for ductal carcinoma in situ (DCIS) in the same breast.1 Despite neoadjuvant chemotherapy and mastectomy with only residual DCIS and negative nodes, patient developed a TNBC re-recurrence only 9 months later. She was treated with chemotherapy, and there remains positive residual localized disease by positron emission tomography (PET). At this point we recommend the following.
Source: International Journal of Radiation Oncology * Biology * Physics - Category: Radiology Authors: Tags: Gray Zone Source Type: research
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Source: Histology and Histopathology - Category: Cytology Tags: Histol Histopathol Source Type: research
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Source: Genome Research - Category: Genetics & Stem Cells Authors: Tags: RESEARCH Source Type: research
Conditions:   Advanced Breast Carcinoma;   Anatomic Stage III Breast Cancer AJCC v8;   Anatomic Stage IIIA Breast Cancer AJCC v8;   Anatomic Stage IIIB Breast Cancer AJCC v8;   Anatomic Stage IIIC Breast Cancer AJCC v8;   Anatomic Stage IV Breast Cancer AJCC v8;   Germlin e BRCA1 Gene Mutation;   Germline BRCA2 Gene Mutation;   HER2/Neu Negative;   Metastatic Breast Carcin...
Source: ClinicalTrials.gov - Category: Research Source Type: clinical trials
Conditions:   Anatomic Stage IV Breast Cancer AJCC v8;   Breast Carcinoma Metastatic in the Bone;   Metastatic Breast Carcinoma;   Metastatic Triple-Negative Breast Carcinoma;   Prognostic Stage IV Breast Cancer AJCC v8 Interventions:   Drug: Paclitaxel;   Radiation: Radium Ra 223 Dichloride Sponsor:   National Cancer Institute (NCI) Not yet recruiting
Source: ClinicalTrials.gov - Category: Research Source Type: clinical trials
Conditions:   Advanced Breast Carcinoma;   Anatomic Stage III Breast Cancer AJCC v8;   Anatomic Stage IIIA Breast Cancer AJCC v8;   Anatomic Stage IIIB Breast Cancer AJCC v8;   Anatomic Stage IIIC Breast Cancer AJCC v8;   Anatomic Stage IV Breast Cancer AJCC v8;   Germlin e BRCA1 Gene Mutation;   Germline BRCA2 Gene Mutation;   HER2/Neu Negative;   Metastatic Breast Carcin...
Source: ClinicalTrials.gov - Category: Research Source Type: clinical trials
Conditions:   Anatomic Stage IV Breast Cancer AJCC v8;   Breast Carcinoma Metastatic in the Bone;   HER2/Neu Negative;   Metastatic Breast Carcinoma;   Metastatic Triple-Negative Breast Carcinoma;   Prognostic Stage IV Breast Cancer AJCC v8 Interventions:   Drug: Paclitaxel;   Radiation: Radium Ra 223 Dichloride Sponsor:   National Cancer Institute (NCI) Not yet recruiting
Source: ClinicalTrials.gov - Category: Research Source Type: clinical trials
Conditions:   Advanced Breast Carcinoma;   Anatomic Stage III Breast Cancer AJCC v8;   Anatomic Stage IIIA Breast Cancer AJCC v8;   Anatomic Stage IIIB Breast Cancer AJCC v8;   Anatomic Stage IIIC Breast Cancer AJCC v8;   Anatomic Stage IV Breast Cancer AJCC v8;   Germlin e BRCA1 Gene Mutation;   Germline BRCA2 Gene Mutation;   HER2/Neu Negative;   Metastatic Breast Carcin...
Source: ClinicalTrials.gov - Category: Research Source Type: clinical trials
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