Signaling plays an important role in regulating all cellular pathways. Altered signaling is one of the hallmarks of cancers. Phosphoproteomics enables interrogation of kinase mediated signaling pathways in biological systems. In cancers, this approach can be utilized to identify aberrantly activated pathways that potentially drive proliferation and tumorigenesis. To identify signaling alterations in head and neck squamous cell carcinoma (HNSCC), we carried out proteomic and phosphoproteomic analysis of HNSCC cell lines using a combination of tandem mass tag (TMT) labeling approach and titanium dioxide-based enrichment. We identified 4,920 phosphosites corresponding to 2,212 proteins in six HNSCC cell lines compared to a normal oral cell line. Our data indicated significant enrichment of proteins associated with splicing. We observed hyperphosphorylation of SRSF protein kinase 2 (SRPK2) and its downstream substrates in HNSCC cell lines. SRPK2 is a splicing kinase, known to phosphorylate serine/arginine (SR) rich domain proteins and regulate splicing process in eukaryotes. Although genome-wide studies have reported the contribution of alternative splicing events of several genes in the progression of cancer, the involvement of splicing kinases in HNSCC is not known. In this study, we studied the role of SRPK2 in HNSCC. Inhibition of SRPK2 resulted in significant decrease in colony forming and invasive ability in a panel of HNSCC cell lines. Our results indicate that phosphorylation of SRPK2 plays a crucial role in the regulation of splicing process in HNSCC and that splicing kinases can be developed as a new class of therapeutic target in HNSCC.
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http://dx.doi.org/10.1080/15384047.2016.1139234 | DOI Listing |
ANZ J Surg
January 2025
Otolaryngology Head and Neck Surgery, Darling Downs Hospital and Health Service, Toowoomba, Queensland, Australia.
Background: Australia has the highest global incidence of keratinocyte cancer. Surgically managing keratinocyte cancers in regional Australia presents geographic and economic challenges, which necessitate cost-effective resource allocation. Previous work has outlined the cost benefit for outpatient day surgical excision of head and neck skin lesions that can be closed primarily.
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January 2025
Department of Otolaryngology-Head and Neck Surgery, Louisiana State University Health Sciences Center, New Orleans, LA 71103, USA.
Head and neck cancer is a deadly disease with over 500,000 cases annually worldwide. Metastatic head and neck cancer accounts for a large proportion of the mortality associated with this disease. Many advances have been made in our understanding of the mechanisms of metastasis.
View Article and Find Full Text PDFCancers (Basel)
January 2025
Department of Otolaryngology/Head and Neck Surgery, Vrije Universiteit, Amsterdam UMC, Boelelaan 1117, P.O. Box 7057, 1007 MB Amsterdam, The Netherlands.
Background/objectives: Most studies on the interaction between the immune system and cancer focus on T-cells, whereas studies on tumor-infiltrating B-lymphocytes (TIL-Bs) are still underrepresented. The aim of this study was to assess the prognostic impact of TIL-Bs in early- and advanced-stage oral cavity squamous cell carcinoma (OCSCC).
Methods: In total, 222 OCSCCs were studied.
Cancers (Basel)
December 2024
Department of Oral and Maxillofacial Surgery and Facial Plastic Surgery, Ludwig Maximilian University of Munich (LMU), 80337 Munich, Germany.
Skin cancer is one of the most prevalent malignancies in the world, with increasing incidence. In 2022, the World Health Organization estimated over 1.5 million new diagnoses of skin malignancies, primarily affecting the older population.
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December 2024
Department of Otolaryngology/Head & Neck Surgery, Zucker School of Medicine, Hofstra University, New York, NY 11040, USA.
Squamous cell carcinoma is the most common malignancy affecting the sinonasal tract. Local recurrence is the main pattern of treatment failure, affecting nearly half of patients treated for primary sinonasal squamous cell carcinoma (SNSCC). Due to disease rarity and heterogeneity of practices, there are limited guidelines for how to diagnose and care for these patients.
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