Title : Effect of human-consumed green and black tea decoctions on murine haematopoietic stem cells – a nutraceutical approach
Abstract:
Background: While the antioxidant properties of tea are well-documented, its specific role in protecting the HSC niche and modulating lineage differentiation under chemical stress remains largely unexplored. Chemotherapeutic agents like cyclophosphamide often induce severe myelosuppression, a condition characterized by the depletion of haematopoietic stem cells (HSCs) and their progenitors.
Methods: This study evaluated the effects of green and black tea decoctions, prepared at concentrations simulating human consumption (2.5g/100ml), on a murine model of cyclophosphamide-induced cellular suppression. BALB/c mice were treated with tea decoctions and cyclophosphamide to assess changes in bone marrow progenitor populations—specifically common myeloid progenitors (CMP), granulocyte-monocyte progenitors (GMP), and common lymphoid progenitors (CLP)—using flow cytometry and gene expression analysis.
Results: Both tea types demonstrated protective qualities, but green tea decoction exhibited superior myeloprotection. It significantly safeguarded the GMP population against cyclophosphamide-induced abrogation. The mechanism of action involves a multi-pathway response:
• Oxidative Stress Mitigation: Induction of the antioxidant enzyme Heme-oxygenase 1 (HO-1) to neutralize reactive oxygen species (ROS).
• DNA Repair Activation: Significant up-regulation of DNA repair enzymes, including PARP-1, DNA pol β, ERCC4, and XRCC1.
• Metabolic Modulation: Enhancement of drug-metabolizing enzymes Cyp1a2 and Cyp2b10, facilitating safer processing of chemotherapeutic agents.
• Immunomodulation: Amelioration of the TLR4-mediated "cytokine storm" by reducing the overproduction of pro-inflammatory cytokines (IL-12, IL-10, TNF-α) through the inhibition of MAPK, JNK, and NFκB pathways.
• Maintenance of Normal HSC environment: The human-consumption-similar green and black tea decoction didn’t show any effect on the HSC population, making it a safe, natural, and preventive therapeutic option.
Novelty and Therapeutic Potential: This research identifies a novel role for everyday green tea consumption in maintaining HSC homeostasis. Unlike synthetic drugs that may introduce further side effects, green tea offers a low-cost, non-toxic, and accessible nutraceutical strategy. Its ability to prime the bone marrow's defense mechanisms suggests a significant therapeutic application for cancer patients undergoing chemotherapy, individuals with autoimmune disorders like lupus or rheumatoid arthritis, and patients preparing for stem cell transplants.
