In Vivo Fluorescence Lifetime Imaging Monitors Binding of Specific Probes to Cancer Biomarkers

One of the most important factors in choosing a treatment strategy for cancer is characterization of biomarkers in cancer cells. Particularly, recent advances in Monoclonal Antibodies (MAB) as primary-specific drugs targeting tumor receptors show that their efficacy depends strongly on characterization of tumor biomarkers. Assessment of their status in individual patients would facilitate selection of an optimal treatment strategy, and the continuous monitoring of those biomarkers and their binding process to the therapy would provide a means for early evaluation of the efficacy of therapeutic intervention. In this study we have demonstrated for the first time in live animals that the fluorescence lifetime can be used to detect the binding of targeted optical probes to the extracellular receptors on tumor cells in vivo. The rationale was that fluorescence lifetime of a specific probe is sensitive to local environment and/or affinity to other molecules. We attached Near-InfraRed (NIR) fluorescent probes to Human Epidermal Growth Factor 2 (HER2/neu)-specific Affibody molecules and used our time-resolved optical system to compare the fluorescence lifetime of the optical probes that were bound and unbound to tumor cells in live mice. Our results show that the fluorescence lifetime changes in our model system delineate HER2 receptor bound from the unbound probe in vivo. Thus, this method is useful as a specific marker of the receptor binding process, which can open a new paradigm in the “image and treat” concept, especially for early evaluation of the efficacy of the therapy

Laser and Light Therapies for Acne

Acne vulgaris is a very common cutaneous disorder which can cause permanent scarring and disfigurement. Acne is a multifactorial disorder of pilosebaceous units and affects the areas of skin with the greatest concentration of sebaceous follicles such as the face, neck, chest, and back. Common therapies for acne treatment include retinoids, keratolytic agents, antimicrobials, and anti-inflammatory agents

Laser and Light Therapies for Acne

Acne vulgaris is a very common cutaneous disorder which can cause permanent scarring and disfigurement.Acne is a multifactorial disorder of pilosebaceous units and affects the areas of skin with the greatest concentration of sebaceous follicles such as the face, neck, chest, and back.Common therapies for acne treatment include retinoids, keratolytic agents, antimicrobials, and anti-inflammatory agents.The need for an alternative treatment has led to the investigation of lasers and light sources as a new treatment.The 1450 nm diode laser, 585- and 595-nm pulsed dye lasers (PDLs), near infrared diode lasers, 1320 nm Nd:YAG laser, 532 nm potassium titanyl phosphate laser, 1064 nm long-pulsed Nd:YAG laser, 1540 nm Erbium (Er):Glass Laser, and the 1550 nm Er:Glass fractional laser are among the most common lasers used to treat acne and acne scarring.1540 nm Erbium (Er):Glass Laser, and the 1550 nm Er:Glass fractional laser are among the most common lasers used to treat acne and acne scarring.These lasers target the underlying causes of acne including the colonization of Priopionibacterium acnes, high levels of sebum production, altered keratinization, inflammation, and bacterial colonization of hair follicles on the face, neck, and back