Live imaging of skin immunity using two-photon microscopy: a short review

Area of Science:

• Dermatology
• Microscopy
• Immunology

Background:

• Two-photon excitation microscopy (TPM) is crucial for high-resolution, real-time imaging of living skin.
• It enables visualization of skin structures and immune responses at cellular resolution, surpassing conventional histology.
• Clinical use is currently limited by safety concerns and equipment cost.

Purpose of the Study:

• To review the structural, functional, and translational aspects of two-photon skin imaging.
• To outline the technical principles and applications of TPM in dermatologic research.
• To discuss the potential implications for clinical diagnosis and research.

Main Methods:

• Utilizing autofluorescence, melanin scattering, and second harmonic generation (SHG) for imaging.
• Observing keratinocyte organization, skin appendages (hair follicles, sebaceous glands), and dermal networks (vascular, lymphatic, neural).
• Analyzing dynamic immune processes within the skin in vivo.

Main Results:

• TPM provides detailed visualization of skin microanatomy and cellular dynamics.
• The technique has been applied in both animal models and human studies.
• Strategies for visualizing collagen and fibrosis using TPM have been explored.

Conclusions:

• Two-photon microscopy is a powerful tool for advancing dermatologic research.
• Further development may overcome current limitations, expanding clinical applications.
• TPM holds significant potential for improving skin disease diagnosis and understanding.