Hyaluronidase PH20/SPAM1: From Tissue Diffusion Agent to Key Drug for Vascular Embolism Rescue

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This article systematically elaborates on the molecular characteristics and biological functions of hyaluronidase PH20 (SPAM1), focusing on its catalytic mechanism as a hyaluronic acid-specific hydrolase and its classic applications in enhancing tissue permeability and dissipating local edema. It particularly analyzes its clinical value and operational strategies in the emergency treatment of vascular embolism caused by hyaluronic acid injections.

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Hyaluronidase PH20/SPAM1: From Tissue Diffusion Agent to Key Drug for Vascular Embolism Rescue

Abstract
This article systematically elaborates on the molecular characteristics and biological functions of hyaluronidase PH20 (SPAM1), focusing on its catalytic mechanism as a hyaluronic acid-specific hydrolase and its classical applications in enhancing tissue permeability and dissipating local edema. It highlights its clinical value and operational strategies in emergency treatment for vascular embolism caused by hyaluronic acid injection.

I. Molecular Characteristics and Classification of Hyaluronidase

Hyaluronidase is a class of enzymes that specifically hydrolyze hyaluronic acid and exists in various forms in the human body. Among them, PH20 (also known as SPAM1 or hyaluronidase PH-20) is one of the most extensively studied and highly active members of this family. The human PH20 gene is located on chromosome 7q31.3, and its encoded mature protein consists of 509 amino acid residues. PH20 hydrolyzes the β-1,4 glycosidic bonds in hyaluronic acid, degrading high-molecular-weight hyaluronic acid into low-molecular-weight fragments.

II. Physiological Functions and Tissue Distribution of Hyaluronidase

Hyaluronic acid is one of the main components of the extracellular matrix, playing a key role in maintaining tissue hydration and limiting the diffusion of macromolecules. PH20 hydrolyzes hyaluronic acid, temporarily reducing the viscosity of the intercellular matrix and promoting the diffusion of fluids and macromolecules in tissue spaces, making it an important diffusion regulator. PH20 is abundantly expressed in the testes, participating in sperm capacitation and the acrosome reaction. It is also abnormally expressed in various tumor tissues, contributing to tumor progression and metastasis.

III. Application of Hyaluronidase in Complications of Hyaluronic Acid Injection

During facial hyaluronic acid injection, accidental intravascular injection can block arteries supplying the eyes, leading to retinal ischemia, vision impairment, or even blindness, as well as skin necrosis in the injection area. Once vascular embolism occurs, early, timely, and effective treatment is crucial.

Hyaluronidase can rapidly liquefy and depolymerize nearly solid hyaluronic acid, thereby alleviating or resolving the embolism. Studies have shown that injecting hyaluronidase around the embolized vessel is an effective treatment. Non-cross-linked hyaluronic acid can be completely hydrolyzed within minutes, while highly cross-linked hyaluronic acid requires more time. Biphasic cross-linked hyaluronic acid (particulate) is more easily hydrolyzed by the enzyme than monophasic cross-linked hyaluronic acid (gel-like).

IV. Clinical Use Strategies for Hyaluronidase

The conventional concentration is 150 units per milliliter, with effects beginning approximately 30 minutes after injection. Gentle massage can promote drug diffusion. In emergency treatment, higher doses are required, typically 0.05 to 0.1 milliliters per injection point, administered slowly. Key points for retrobulbar injection include: using a 25G, 1.5-inch needle to draw 3 to 8 milliliters of hyaluronidase (at least 500 international units), advancing the needle along the inferotemporal region of the eye to the orbital floor, confirming no blood return, and then slowly injecting the drug.

V. Conclusion

As a specific hydrolase for hyaluronic acid, hyaluronidase has long been used in enhancing tissue permeability and dissipating local edema due to its unique ability to rapidly reduce intercellular viscosity. Its critical role in emergency treatment for vascular embolism caused by hyaluronic acid injection further expands its clinical value. Precise dosing strategies and standardized operational procedures are essential for ensuring treatment efficacy and safety, while high-quality recombinant PH20 protein provides crucial support for related research and quality control.

In basic research and clinical applications related to hyaluronidase, high-quality recombinant PH20 protein is a key tool for enzyme activity analysis, quality control, and method development. To meet this research need, Uni offers Hyaluronidase PH20/SPAM1, Human, suitable for establishing and validating hyaluronidase activity assays, quality control of hyaluronidase products, and basic research on hyaluronidase.

This article is reviewed and published by the technical expert team of UA

Disclaimer: This article partially utilizes artificial intelligence assistance in its creation. If any content involves copyright or intellectual property issues, please let us know and we promise to verify and remove it as soon as possible.

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