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Updated: Feb 9, 2026

Anticancer Efficacy of Photodynamic Therapy with Lung Cancer-Targeted Nanoparticles
Published on: December 1, 2016
Cysteine cathepsins as a prospective target for anticancer therapies-current progress and prospects
Aneta Pogorzelska1, Beata Żołnowska1, Rafał Bartoszewski2
1Department of Organic Chemistry, Medical University of Gdansk, Hallera 107, 80-416 Gdansk, Poland.
Abstract:
Cysteine cathepsins (CTS), being involved in both physiological and pathological processes, play an important role in the human body. During the last 30 years, it has been shown that CTS are highly upregulated in a wide variety of cancer types although they have received a little attention as a potential therapeutic target as compared to serine or metalloproteinases. Studies on the increasing problem of neoplastic progression have revealed that secretion of cell-surface- and intracellular cysteine proteases is aberrant in tumor cells and has an impact on their growth, invasion, and metastasis by taking part in tumor angiogenesis, in apoptosis, and in events of inflammatory and immune responses. Considering the role of CTS in carcinogenesis, inhibition of these enzymes becomes an attractive strategy for cancer therapy. The downregulation of natural CTS inhibitors (CTSsis), such as cystatins, observed in various types of cancer, supports this claim. The intention of this review is to highlight the relationship of CTS with cancer and to present illustrations that explain how some of their inhibitors affect processes related to neoplastic progression.
Insights
Cysteine cathepsins (CTS) are upregulated in cancer, impacting tumor growth and metastasis. Inhibiting CTS offers a promising therapeutic strategy for cancer treatment.
Area of Science:
- Biochemistry
- Molecular Biology
- Oncology
Background:
- Cysteine cathepsins (CTS) are crucial enzymes in physiological and pathological processes.
- CTS are significantly upregulated in various cancer types, yet are under-explored as therapeutic targets compared to other proteases.
- Aberrant secretion of CTS in tumor cells influences cancer growth, invasion, metastasis, angiogenesis, apoptosis, and immune responses.
Purpose of the Study:
- To review the multifaceted role of cysteine cathepsins in cancer.
- To explore the potential of CTS inhibition as a cancer therapy strategy.
- To illustrate how CTS inhibitors impact neoplastic progression.
Main Methods:
- Literature review focusing on cysteine cathepsins and cancer.
- Analysis of studies on CTS involvement in tumor growth, invasion, and metastasis.
- Examination of the role of natural CTS inhibitors (cystatins) in cancer.
Main Results:
- Cysteine cathepsins play a significant role in tumor progression, including angiogenesis, apoptosis, and immune evasion.
- Downregulation of endogenous CTS inhibitors like cystatins is observed in many cancers.
- Inhibition of CTS presents a viable therapeutic avenue for managing neoplastic diseases.
Conclusions:
- Cysteine cathepsins are key players in carcinogenesis and represent attractive targets for novel cancer therapies.
- Targeting CTS, potentially through the use of specific inhibitors, could offer a new strategy to combat cancer progression.
- Further research into CTS and their inhibitors is warranted to develop effective cancer treatments.
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