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Uncovering Porphyrin Accumulation in the Tumor Microenvironment
Swamy R Adapa1,2, Abdus Sami3, Pravin Meshram2
1USF Genomics Program, Center for Global Health and Infectious Diseases, College of Public Health, University of South Florida, Tampa, FL 33612, USA.
Genes
|July 27, 2024
Summary
Cancer cells and associated stromal cells exhibit abnormal heme biosynthesis, termed "Porphyrin Overdrive," leading to porphyrin accumulation. This tumor microenvironment phenomenon correlates with poorer survival in aggressive cancers, suggesting a therapeutic target.
Area of Science:
- Biochemistry
- Cancer Biology
- Cell Biology
Background:
- Heme is vital for organisms, but its precursor, protoporphyrin IX, can be cytotoxic.
- Precise regulation of heme biosynthesis is crucial for cellular health.
Purpose of the Study:
- To investigate porphyrin intermediate accumulation within the tumor microenvironment (TME).
- To explore the concept of "Porphyrin Overdrive" in cancer survival and its link to heme biosynthesis dysregulation.
Main Methods:
- Analysis of porphyrin levels in lung cancer cells and stromal cells within the TME.
- Investigating the role of cancer-associated fibroblasts (CAFs) in porphyrin production.
- Comparing porphyrin levels in tumor tissues versus normal tissues.
- Assessing the impact of tumor removal on CAF porphyrin production.
Main Results:
- Porphyrins accumulate in both cancer and stromal cells within the TME.
- CAFs contribute to porphyrin overproduction via an imbalanced pathway.
- Normal tissues show no porphyrin accumulation; CAFs outside the TME normalize production.
- Porphyrin imbalance correlates with poorer survival in aggressive cancers.
Conclusions:
- Cancer-associated porphyrin accumulation, termed "Porphyrin Overdrive," is confined to the tumor-specific niche.
- This phenomenon highlights dysregulated heme biosynthesis in the TME.
- Anomalous porphyrin dynamics in the TME present a potential therapeutic target.
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