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A novel manganese-based molecule, Mn-PTP, offers a new strategy against tuberculosis. Activated by light, it releases multiple therapeutic agents to kill bacteria and heal wounds, outperforming current treatments.

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Area of Science:

  • Medicinal Chemistry
  • Photodynamic Therapy
  • Infectious Diseases

Background:

  • Tuberculosis (TB) remains a leading infectious killer, driven by increasing Mycobacterium tuberculosis (Mtb) drug resistance.
  • Conventional treatments are insufficient, necessitating innovative therapeutic approaches.

Purpose of the Study:

  • To introduce a novel manganese(I)-based photoactivatable carbon monoxide-releasing molecule (Mn-PTP) as a multi-pronged therapeutic agent.
  • To evaluate Mn-PTP's efficacy against Mycobacterium smegmatis and its potential in treating TB infections.

Main Methods:

  • Synthesis and characterization of the Mn-PTP complex.
  • In vitro assessment of antibacterial activity, biofilm disruption, and cytotoxicity.
  • In vivo evaluation of wound healing in infected mice.

Main Results:

  • Mn-PTP demonstrated potent in vitro antibacterial activity (MIC90 = 3.11 μM) and significant biofilm disruption against M. smegmatis.
  • Light activation of Mn-PTP triggers release of CO, ROS generation, a toxic ligand, and formation of MnO(x) species, alleviating hypoxia.
  • In vivo studies showed Mn-PTP significantly accelerated wound healing in infected mice, surpassing isoniazid efficacy.
  • Minimal cytotoxicity was observed in normal cells, indicating high selectivity.

Conclusions:

  • Mn-PTP represents a versatile "one-for-all" therapeutic platform combining photodynamic therapy, CO delivery, and metal-based reactivity.
  • This light-activated agent effectively combats bacterial infections by releasing multiple active components.
  • Mn-PTP offers a promising blueprint for next-generation metal-based therapeutics against persistent mycobacterial infections.