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Substance Name: Secretory leukocyte protease inhibitor
RN: 122320-05-2
UNII: 909E17P4ZW


  • A proteinase inhibitor found in various BODILY SECRETIONS that coat mucosal surfaces such as SEMINAL PLASMA; CERVICAL MUCUS; and bronchial secretions. It plays a role in protecting epithelial tissues from LEUKOCYTE-derived serine proteases such as NEUTROPHIL ELASTASE.

Molecular Formula

  • Unspecified

Classification Codes

  • Enzyme Inhibitors
  • Protease Inhibitors
  • Serine Proteinase Inhibitors
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Names and Synonyms

Results Name

  • Secretory leukocyte protease inhibitor

Name of Substance

  • Secretory leukocyte protease inhibitor

MeSH Heading

  • Secretory Leukocyte Peptidase Inhibitor


  • Antileucoprotease
  • Mucous proteinase inhibitor
  • Secretory leukocyte protease inhibitor
  • Serine leukocyte proteinase inhibitor
  • SLPI
  • UNII-909E17P4ZW

Systematic Name

  • Proteinase inhibitor, MPI

Registry Numbers

CAS Registry Number

  • 122320-05-2


  • 909E17P4ZW

Other Registry Number

  • 114189-84-3

System Generated Number

  • 0122320052