Philadelphia University + Thomas Jefferson University

Yang, Haifeng

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Haifeng Yang

Haifeng Yang, PhD

Contact Dr. Yang

1020 Locust Street
JAH 336D
Philadelphia, PA 19107

(215) 503-6163

Research and Clinical Interests

Cancer is a genetic disease. It develops after spelling errors appear in the blueprint of the book of life: our DNA. Activation mutations in oncogenes and/or inactivation mutations in tumor suppressor drive tumor formation. In human kidney cancer, the highly frequent mutations in a critical tumor suppressor gene VHL are the leading cause of tumor development.

It is now known that VHL loss would trick cells into the state of pseudo hypoxia (oxygen deprivation): the cancer cells think that they are extremely low on oxygen supply, and they activate a transcriptional response (reading from the DNA). Long-term, uncontrolled activation of this hypoxia response program drives the development of kidney cancer. Anti-angiogenesis therapies, which partially block this program, produce positive albeit often transient outcomes in kidney cancer patients. Thus, better understanding of the hypoxia response program might enable us to better exploit the weakness of VHL-defective cancer cells.

Our group discovered that this abnormally activated transcriptional program significantly altered a critical mark on histone, proteins that package DNA and regulate its reading. This was achieved through activating an enzyme called JARID1C. In VHL-defective cancer cells, JARID1C reduced the mark on histone. Furthermore, JARID1C contributed to drug resistance.

Thus in project 1, we will address mechanistically how JARID1C is activated, and whether disrupting JARID1C would defeat the drug resistance.

We have identified that VHL protein regulates the protein stability of the oncogene EGFR. In project 2 we will elucidate the biochemical mechanism.

Recently 40% of kidney cancer was found to harbor mutations in PBRM1. PBRM1 is a critical targeting subunit of a protein complex that remodels the structure of human chromosome. In project 3, we are studying how the tumor-derived mutations of PBRM1 disrupt its biochemical functions, and how PBRM1 collaborates with JARID1C to regulate gene transcription.

In project 4, we are collaborating with the clinicians and scientists at Fox Chase Cancer Center and Cleveland Clinic to investigate whether the unique genetic makeup of the tumors lead to drastically different drug response to current anti-angiogenic therapies.

Publications

Most Recent Peer-Reviewed Publications

  1. Immunohistochemistry successfully uncovers intratumoral heterogeneity and widespread co-losses of chromatin regulators in clear cell renal cell carcinoma
  2. The structure and regulation of Cullin 2 based E3 ubiquitin ligases and their biological functions
  3. The roles of chromatin-remodelers and epigenetic modifiers in kidney cancer
  4. The contributions of HIF-target genes to tumor growth in RCC
  5. The roles of VHL-dependent ubiquitination in signaling and cancer
  6. The von Hippel-Lindau tumor suppressor protein regulates gene expression and tumor growth through histone demethylase JARID1C
  7. The von hippel-lindau tumor suppressor protein promotes c-Cbl-independent poly-ubiquitylation and degradation of the activated EGFR
  8. pVHL Acts as an Adaptor to Promote the Inhibitory Phosphorylation of the NF-κB Agonist Card9 by CK2
  9. Neuronal apoptosis linked to EglN3 prolyl hydroxylase and familial pheochromocytoma genes: Developmental culling and cancer
  10. Analysis of von Hippel-Lindau Hereditary Cancer Syndrome: Implications of Oxygen Sensing
  11. Biochemical purification and pharmacological inhibition of a mammalian prolyl hydroxylase acting on hypoxia-inducible factor
  12. Structure of an HIF-1α-pVHL complex: Hydroxyproline recognition in signaling
  13. Molecular pathogenesis of the von Hippel-Lindau hereditary cancer syndrome: Implications for oxygen sensing
  14. Von Hippel-Lindau protein mutants linked to type 2C VHL disease preserve the ability to downregulate HIF
  15. HIFα targeted for VHL-mediated destruction by proline hydroxylation: Implications for O2 sensing
  16. Loss of a protein phosphatase 2A regulatory subunit (Cdc55p) elicits improper regulation of Swe1p degradation
  17. Variation among cell types in the signaling pathways by which IGF-I stimulates specific cellular responses
  18. Molecular genetic analysis of Rts1p, a B' regulatory subunit of Saccharomyces cerevisiae protein phosphatase 2A