Mayo Clinic laboratory and pathology research roundup: April 13

By Samantha Rossi • April 13, 2021

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The research roundup provides an overview of the past week’s research from Mayo Clinic Laboratories consultants, including featured abstracts and a complete list of published studies and reviews.

Featured Abstract

A noncanonical AR addiction drives enzalutamide resistance in prostate cancer.

Resistance to next-generation anti-androgen enzalutamide (ENZ) constitutes a major challenge for the treatment of castration-resistant prostate cancer (CRPC). By performing genome-wide ChIP-seq profiling in ENZ-resistant CRPC cells we identify a set of androgen receptor (AR) binding sites with increased AR binding intensity (ARBS-gained). While ARBS-gained loci lack the canonical androgen response elements (ARE) and pioneer factor FOXA1 binding motifs, they are highly enriched with CpG islands and the binding sites of unmethylated CpG dinucleotide-binding protein CXXC5 and the partner TET2. RNA-seq analysis reveals that both CXXC5 and its regulated genes including ID1 are upregulated in ENZ-resistant cell lines and these results are further confirmed in patient-derived xenografts (PDXs) and patient specimens. Consistent with the finding that ARBS-gained loci are highly enriched with H3K27ac modification, ENZ-resistant PCa cells, organoids, xenografts and PDXs are hyper-sensitive to NEO2734, a dual inhibitor of BET and CBP/p300 proteins. These results not only reveal a noncanonical AR function in acquisition of ENZ resistance, but also posit a treatment strategy to target this vulnerability in ENZ-resistant CRPC. Via Nature communications.

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Published to PubMed This Week

• Juvenile papillomatosis of breast.
  Mayo Clinic Proceedings
• Genetic predictors of chemotherapy-induced peripheral neuropathy from paclitaxel, carboplatin and oxaliplatin: NCCTG/Alliance N08C1, N08CA and N08CB study.
  Cancers (Basel)
• Fatty acid synthase confers tamoxifen resistance to ER+/HER2+ breast cancer.
  Cancers (Basel)
• Stem cell therapy for microvascular injury associated with ischemic nephropathy.
  Cells
• Anesthesiology residents' experiences and perspectives of residency training.
  Anesthesiology and Analgesia
• Automated identification of glomeruli and synchronized review of special stains in renal biopsies by machine learning and slide registration: A cross-institutional study.
  Histopathology
• Metastatic or suspected metastatic cancer in patients 90 years of age or older: A single-institution, multi-site study.
  Journal of Geriatric Oncology
• Dosimetric assessment of a high precision system for mouse proton irradiation to assess spinal cord toxicity.
  Radiology Research
• Assessment of isochromosome 12p & 12p abnormalities in germ cell tumors using FISH, SNP-Arrays & NGS/ Mate-Pair sequencing.
  Human Pathology
• What to do when the gold standard isn't accessible?
  Clinical Biochemistry

Samantha Rossi

Samantha Rossi is a Digital Marketing Manager at Mayo Clinic Laboratories. She supports marketing strategies for product management and specialty testing. Samantha has worked at Mayo Clinic since 2019.