Journals / Acta Medica Nicomedia / 2025 / Cilt: 8 Sayı: 3

Perforin and Granzyme Levels in CXCR5⁺CD8⁺ Follicular Cytotoxic T Cells, CD8⁺ T Cells, and NK Cells in Chronic Lymphocytic Leukemia Patients

Kronik Lenfositik Lösemi Hastalarında CXCR5+CD8+ Foliküler Sitotoksik T hücreleri, CD8+ T hücreleri ve NK Hücrelerinde Perforin ve Granzim Seviyeleri

Metin Yusuf Gelmez(İSTANBUL ÜNİVERSİTESİ, AZİZ SANCAR DENEYSEL TIP ARAŞTIRMA ENSTİTÜSÜ, İMMÜNOLOJİ ANABİLİM DALI)0000-0002-5279-0855
Fatma Betul Oktelık(İSTANBUL ÜNİVERSİTESİ, AZİZ SANCAR DENEYSEL TIP ARAŞTIRMA ENSTİTÜSÜ, İMMÜNOLOJİ ANABİLİM DALI)0000-0002-7994-5618
Murat Özbalak(İSTANBUL ÜNİVERSİTESİ, İSTANBUL TIP FAKÜLTESİ, DAHİLİ TIP BİLİMLERİ BÖLÜMÜ)0000-0002-3040-4052
İpek Yönal Hindilerden(İSTANBUL ÜNİVERSİTESİ, İSTANBUL TIP FAKÜLTESİ, DAHİLİ TIP BİLİMLERİ BÖLÜMÜ)0000-0003-1353-2367
Günnur Deniz(ISTANBUL UNIVERSITY, AZIZ SANCAR INSTITUTE OF EXPERIMENTAL MEDICINE)0000-0002-0721-6213
Pages
308–313
Publication Date
2025-10-22
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AI Summary & Key Takeaways

AI Insight
⚡ TL;DR(Too Long; Didn't Read)

Our findings indicate that TFC cells may be more effective in targeting malignant B cells in CLL pathogenesis and could be considered as a potential target for immunotherapy. with high perforin and granzyme levels, along with their higher perforin content compared to CD8+ T cells, suggests that TFC cells might be more effective in the lysis of malign B-CLL cells in CLL and could represent a potential new cell population for use in immunotherapies.

📌 3 Key Takeaways

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Objective & Hypothesis:Objective: Chronic lymphocytic leukemia (CLL) is a type of leukemia characterized by the accumulation of CD19+ malignant B cells in lymph nodes, blood, and bone marrow, which aberrantly express the T-cell marker CD5.
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Key Findings & Data:Although several studies have investigated the frequencies and functions of CD8+ T, NK, and follicular cytotoxic T (TFC) cells in CLL patients, no study has specifically compared the perforin and granzyme contents of these cells.
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Conclusion & Impact:Our findings indicate that TFC cells may be more effective in targeting malignant B cells in CLL pathogenesis and could be considered as a potential target for immunotherapy. with high perforin and granzyme levels, along with their higher perforin content compared to CD8+ T cells, suggests that TFC cells might be more effective in the lysis of malign B-CLL cells in CLL and could represent a potential new cell population for use in immunotherapies.
🔬Design:Araştırma Makalesi
📍Scope:Comprehensive Sample
⚙️Variables:Kronik lenfositik lösemi · CD8+ T · Foliküler sitotoksik T hücreler

Abstract

Objective: Chronic lymphocytic leukemia (CLL) is a type of leukemia characterized by the accumulation of CD19+ malignant B cells in lymph nodes, blood, and bone marrow, which aberrantly express the T-cell marker CD5. Although several studies have investigated the frequencies and functions of CD8+ T, NK, and follicular cytotoxic T (TFC) cells in CLL patients, no study has specifically compared the perforin and granzyme contents of these cells. This study aimed to analyse the levels of perforin and granzyme in CD8+ T, NK, and TFC cells in CLL patients. Methods: A total of 14 untreated CLL patients and 9 age-matched healthy individuals were enrolled in this study. The proportions of CD8+ T, NK, and TFC cells, as well as their perforin and granzyme levels, were determined using flow cytometry. Results: Decreased NK cells and increased TFC and CD8+ T cells were observed in CLL patients. Compared to healthy individuals, granzyme B levels were lower in NK cells but higher in TFC cells of CLL patients, while perforin levels were elevated in all three cell groups. When comparing perforin and granzyme content among CD8+ T, NK, and TFC cells in CLL patients, NK and TFC cells exhibited higher perforin levels than CD8+ T cells. Conclusion: The reduced number and low perforin content of NK cells in CLL patients suggest that their role in CLL pathogenesis may be more limited compared to other cytotoxic cells. Our findings indicate that TFC cells may be more effective in targeting malignant B cells in CLL pathogenesis and could be considered as a potential target for immunotherapy. with high perforin and granzyme levels, along with their higher perforin content compared to CD8+ T cells, suggests that TFC cells might be more effective in the lysis of malign B-CLL cells in CLL and could represent a potential new cell population for use in immunotherapies.

Özet

Amaç: Kronik lenfositik lösemi (KLL), bir T hücre belirteci olan CD5 proteinini aberan olarak ifade eden CD19+ malign B hücrelerin lenf nodu, kan ve kemik iliğinde biriktiği lösemi tipidir. KLL hastalarında CD8+ T, NK ve foliküler sitotoksik T (TFC) hücre oranları ve fonksiyonlarını inceleyen farklı çalışmalar bulunmakla birlikte, bu hücrelerin perforin ve granzim içeriklerini karşılaştıran bir çalışma bulunmamaktadır. Bu çalışmada KLL hastalarında CD8+ T, NK ve TFC hücrelerin perforin ve granzim seviyeleri incelenmiştir. Yöntem: Tedavi almayan KLL tanılı 14 hasta ve 9 sağlıklı birey çalışmaya dahil edilmiştir. CD8+ T, NK ve TFC hücre oranları ve bu hücrelerde perforin ve granzim seviyeleri akan hücre ölçer sistemi ile saptanmıştır. Bulgular: KLL hastalarında NK hücrelerinin azaldığı, buna karşılık CD8+ T ve TFC hücrelerinin arttığı tespit edilmiştir. Sağlıklı bireyler ile karşılaştırıldığında, KLL hastalarının NK hücrelerinde granzim B seviyesinin düşük, TFC hücrelerinde ise yüksek olduğu gözlenirken, perforin seviyesinin her üç hücre grubunda da arttığı belirlenmiştir. KLL hastalarının CD8+ T, NK ve TFC hücrelerindeki perforin ve granzim içerikleri kendi aralarında değerlendirildiğinde, NK ve TFC hücrelerinde CD8+ T hücrelerine göre daha yüksek perforin seviyelerine sahip olduğu gözlenmiştir. Sonuç: KLL hastalarında NK hücrelerinin sayıca azalması ve düşük perforin içerikleri, NK hücrelerinin KLL patogenezindeki rolünün diğer sitotoksik hücrelere göre daha sınırlı olabileceğini düşündürmektedir. Bulgularımız TFC hücrelerin KLL patogenezinde malign B hücrelerine karşı daha etkili olabileceğini ve immünoterapilerde hedeflenebilecek potansiyel bir hücre grubu olarak değerlendirilebileceğini göstermektedir.

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Cite This Article

Gelmez, M. Y., Oktelık, F. B., Özbalak, M., Hindilerden, İ. Y., Deniz, G. (2025). Perforin and Granzyme Levels in CXCR5⁺CD8⁺ Follicular Cytotoxic T Cells, CD8⁺ T Cells, and NK Cells in Chronic Lymphocytic Leukemia Patients. Acta Medica Nicomedia, Cilt: 8 Sayı: 3, 308–313. https://doi.org/10.53446/actamednicomedia.1691789

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