Hypermethylation is an important mechanism for repression of tumor gene suppressor in cancer. The drug 5'-azacytidine (AZC) has been used as demethylating agent to induce the expression of previously silencing genes. In the present work, we attempted to determine, using proteomics, the changes in protein expression profiles following a treatment of an Epstein Barr virus (EBV)-negative Burkitt lymphoma (BL) cell line DG 75. The effects of the treatment in terms of cell viability and growth were first examined. The following observations were made: AZC treatment led to (i) a decrease in cell growth with an arrest of the cell at G0/G1 phase of the cell cycle, (ii) the expression of p16, a tumor-suppressor gene whose expression was dependent on its promoter demethylation. Proteomic study evidenced that AZC treatment affected protein expression in two different ways. Twenty-one polypeptides were down-expressed, while 14 showed an increased expression. Some of the upregulated proteins appeared related to the energy metabolism, to organization of cytoskeletal structures, and to cell viability and protein synthesis. We also established a reference map for proteins in DG 75 cell line, comprising 74 different polypeptides corresponding to 67 proteins. This map will be accessible via Internet as a resource for proteome analyses of B-cells. Taken together, the results presented here highlight new insights into lymphoma cell gene regulations following a treatment of lymphoma cells with AZC and illustrate a use of proteomics to evidence the direct and indirect effects of a drug and the pathways it possibly regulates.
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http://dx.doi.org/10.1002/1522-2683(200105)22:9<1867::AID-ELPS1867>3.0.CO;2-7 | DOI Listing |
Cancer Med
January 2025
Department of Pharmacology, College of Pharmacy, Jinan University, Guangzhou, China.
Background: Distinctive heterogeneity characterizes diffuse large B-cell lymphoma (DLBCL), one of the most frequent types of non-Hodgkin's lymphoma. Mitochondria have been demonstrated to be closely involved in tumorigenesis and progression, particularly in DLBCL.
Objective: The purposes of this study were to identify the prognostic mitochondria-related genes (MRGs) in DLBCL, and to develop a risk model based on MRGs and machine learning algorithms.
J Microsc Ultrastruct
December 2022
Department of Pathology, IMS and SUM Hospital, Bhubaneswar, Odisha, India.
Primary bone lymphomas are unusual, and accounts for 2% among all lymphomas. Primary sacral lymphomas are still rarer with only 12 cases reported till date. They predominantly affect elderly males, showing occasional spinal epidural space involvement.
View Article and Find Full Text PDFJ Microsc Ultrastruct
January 2023
Department of Pathology, Maulana Azad Medical College, New Delhi, India.
Context: Diffuse large B-cell lymphoma (DLBCL) is a neoplasm of medium-to-large B lymphoid cells with diffuse growth patterns. Although it is a potentially curable disease, around 40% of the cases are either refractory to primary treatment or relapse. Based on gene expression profiling (GEP), DLBCL can be classified as germinal center B-cell subtype (GCB) and activated B-cell subtype (ABC).
View Article and Find Full Text PDFAm J Ophthalmol Case Rep
March 2025
Department of Ophthalmology, Hospital Sultan Idris Shah, Serdang, Malaysia.
Purpose: To highlight a case report of high-grade primary lacrimal sac Burkitt lymphoma in a young adult.
Observation: A 25-year-old gentleman was referred to the oculoplastic center for left eye medial canthal progressive swelling at the level below the medial canthal tendon for two months associated with tearing. He was initially treated for preseptal cellulitis but failed to respond to antibiotics.
Cureus
December 2024
Hematology and Medical Oncology, East Carolina University (ECU) Health Medical Center/Brody School of Medicine, Greenville, USA.
Primary cutaneous B-cell lymphoma (PCBCL) has three subtypes, among those, the leg type variant is the rarest with the highest rates of relapse and recurrence making it an intriguing focus for researchers. Nevertheless, prior to framing a diagnosis solely based on the lesion's location, it is prudent to reconsider whether it is genuinely a primary cutaneous B-cell lymphoma (PCBCL) or if it aligns more closely with the more prevalent lymphoma variants such as diffuse large B-cell lymphoma (DLBCL) with cutaneous involvement. We are reporting a case of an 85-year-old African American lady, who presented with unilateral left leg DLBCL with cutaneous involvement.
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