Identification of Differentially Expressed Proteins from Smokeless Tobacco Addicted Patients Suffering from Oral Squamous Cell Carcinoma

  • Uzma Urooj Malik
  • Imtiaz Ather Siddiqui
  • Amber Ilyas
  • Zehra Hashim
  • Lisa Staunton
  • Anna Kwasnik
  • Stephen R. Pennington
  • Shamshad ZarinaEmail author
Original Article


Oral squamous cell carcinoma (OSCC) is the eight most common malignancy worldwide with an incidence rate of 40% in south-east Asia. Lack of effective diagnostic tools at early stage and disease recurrence despite extensive treatments are main reasons for high mortality and low survival rates. The aim of current study was to identify differentially expressed proteins to explore potential candidate biomarkers having diagnostic significance. We performed comparative proteomic analysis of paired protein samples (cancerous buccal mucosa and adjacent normal tissue) from OSCC patients using a combination of two dimensional gel electrophoresis and Mass spectrometric analysis. On the basis of spot intensity, seventeen proteins were found to be consistently differentially expressed among most of the samples which were identified through mass spectrometry. For validation of identified proteins, expression level of stratifin was determined using immuno-histochemistry and Western blot analysis. All identified proteins were analyzed by STRING to explore their interaction. Among uniquely identified proteins in this study, at least two candidate markers (Ig Kappa chain C region and Isoform 2 of fructose bisphosphate aldolase A) were found to be novel with respect to OSCC which can be explored further. Results presented in current study are likely to contribute in understanding the involvement of these molecules in carcinogenesis apart from their plausible role as diagnostic/prognostic markers.


Oral squamous cell carcinoma Tissue proteomics Differential expression Biomarker Smokeless tobacco 



Financial assistance was provided by Higher Education Commission, Pakistan (Project no. 20-1809). UUM was recipient of EMEA scholarship (SGA 2012-2642) funded by the Erasmus Mundus Programme of EU. Authors acknowledge the technical assistance offered by Kieran Wynne, UCD Conway Institute.

Compliance with Ethical Standards

Ethical Approval

The study was approved by IRB, (NCP-108), University of Karachi and guidelines proposed by the Declaration of Helsinki were followed.


The work described has not been published previously and the authors declare no competing financial interests.


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Copyright information

© Arányi Lajos Foundation 2019

Authors and Affiliations

  1. 1.National Center for ProteomicsUniversity of KarachiKarachiPakistan
  2. 2.School of Medicine and Medical Science, UCD Conway Institute of Biomolecular and Biomedical ResearchUniversity College DublinDublinIreland
  3. 3.Jinnah Postgraduate Medical CentreKarachiPakistan

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