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Small molecular fluorophores have emerged as powerful tools to advance drug discovery as well as dual modal phototherapy. In 2021, these are widely used in cellular imaging, environmental analysis, drug discovery, drug distribution etc. This latest molecular bioimaging is providing new opportunities to study drug transport in biological systems with spatial and temporal resolutions by integration with advanced techniques including Computed Tomography, Positron Emission Technology etc.

In comparison to traditional infrared fluorophores, this newest technology with significantly enhanced stability against photobleaching is capable of prolonging the time of tumor imaging to improve the dual modal phototherapy efficiency. These are gaining significant attraction as they are more convenient in achieving fruitful structures through chemical synesis and covers a wide range of wavelength and brightness.

In the present, the use of small molecular fluorophores in dual modal photherapy is prefered more in comparison to inorganic NIR- II materials and other detection methods due to their good biocompatibility, tunable structure, high imaging quality and excellent phototoxicity which has shown great potential for cancer as well as other phototheranostics.

Such organic small molecular fluorophores display excellent cytotoxicity when illuminated with the NIR laser. The conjugates of these fluorescent molecules and therapeutic agents create exciting avenues for real-time montoring of drugs delivery and distribution in both vitro and vivo.

Such simple small molecular fluorophores also presents a strategy to develop small-molecule based cancer theranostic materials for simultaneous cancer targeting, imaging and therapy.

The introduction of this technology is optimizing the efficacy and safety of therapies for potentially transformative advances in biomedicine. These fluorophores are streamlining the entire drug development process resulting in significant cost savings for the overall healthcare system.

Applications of phototherapy or light therapy in the healthcare industry are ameliorating. Conventionally, phototherapy devices developed by prominent pharmaceutical & medical device manufacturers in the world were directed towards their use in helio-therapeutics.

Phototherapy devices as medical instruments served the function of exposing specific wavelengths of light to targeted body parts by using lasers, polychromatic polarized lights, light-emitting diodes, or fluorescent lamps. Bright dichroic lamps and full-spectrum lights were also used for developing effective phototherapy devices.

Changing conditions of end-use patients for phototherapy have transformed the approach of manufacturers towards development of phototherapy devices. Previously, light exposed through phototherapy devices was prescribed for shorter time periods.

New conditions of skin cancer, diabetic retinopathy and other disorders recorded across the globe have changed the recommendation or prescription guidelines in use of phototherapy devices. Increasing incidence of delayed sleep phase disorders have also propelled the demand for phototherapy and the devices used in this treatment.

Strong evidence collected from clinical studies have also surged the importance of phototherapy devices in treatment of non-seasonal psychiatric disorders.

The most recent development in the field of phototherapeutics is a new study that reveals the role of synthesized small molecular fluorophore in enhancing dual modal phototherapy. Including photothermal therapy (PTT) and photodynamic therapy (PDT), phototherapy continues to be a noninvasive and effective treatment for cancer. In a phototherapeutic treatment of cancer, light energy is absorbed by photosensitizers is converted into excessive reactive oxygen species, also called as local hyperthermia, which effectively kills cancerous cells.

Studies that came across in recent years have been focused on combining the fluorescence of imaging agents, the tumor-inhibition abilities of photosensitizers, and the targeting properties of nanostructures by constructing nanoparticle systems in the field of tumor theranostics. Although, complex synthesis and complicated components have limited the application purview of theranostic nanosystems in phototherapeutic treatment of cancer.

Chinese College Study redefines Effectiveness of Dual Modal Phototherapy Devices

A team of college academics, led by Yueqing Gu, at the State Key Laboratory of Natural Medicines, based in Nanjing China, recently published their work revealing how inherent tumor specific targeting abilities of a small molecular fluorophore were synthesized for enhanced dual modal phototherapy and long-duration synchronous cancer imaging. According to the reports, the small molecule – NIR-03 – despite being simple in structure, featured some important and unique advantages, which follow:

• Facilitating real-time, in-vivo tumor monitoring through fluorescence imaging in the near-infrared window
• Possessing inherent abilities of targeting tumors, but to certain tumor cell lines
• Using the synthesis abilities for image-guided synergistic PDT and PTT tumor therapies
• Enhanced stability against photo-bleaching, compared to traditional near-infrared fluorophore indocyanine green

Such abilities of synthesized small molecular fluorophore can enhance the efficiency of phototherapy devices, and prolong the duration of tumor imaging effectively.

In comparison with normally-adopted phototherapy methods that incorporate imaging agent, photodynamic photosensitizers and photothermal photosensitizers into nanostructures for facilitating image-guided laser treatment and simultaneous PTT/PDT treatments, this small molecular fluorophore offers development of small-molecule-based cancer theranostic materials, which can be used for enhancing simultaneous cancer targeting, therapy and imaging.