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Related Experiment Videos

Substance P in human tears.

Masakazu Yamada1, Masaro Ogata, Masataka Kawai

  • 1Department of Ophthalmology, Keio University School of Medicine, Tokyo, Japan. yamadam@sc.itc.keio.ac.jp

Cornea
|January 6, 2004
PubMed
Summary
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Substance P (SP) is present in human tears and its levels may indicate ocular surface health. Tears contain enzymes that break down SP, potentially protecting the eye.

Area of Science:

  • Ophthalmology
  • Neuroscience
  • Biochemistry

Background:

  • Substance P (SP) is a neuropeptide involved in sensory transmission and inflammation.
  • Its role and presence in ocular tissues, including tears, are not fully understood.
  • Understanding SP in tears could offer insights into ocular surface conditions.

Purpose of the Study:

  • To quantify substance P-like immunoreactivity (SPLI) in human tears.
  • To biochemically characterize SPLI in tears.
  • To determine if tear SP levels correlate with ocular surface status.

Main Methods:

  • Collection and purification of unstimulated human tears.
  • Quantification of SPLI using enzyme immunoassay (EIA).
  • Biochemical analysis via high-performance liquid chromatography (HPLC) and SP catabolism studies.

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Main Results:

  • Normal human tears contain 306.0 +/- 96.5 pg/mL of SPLI.
  • Lower SPLI levels were observed in eyes with corneal hypesthesia.
  • HPLC revealed multiple SPLI components and SP breakdown products in tears.

Conclusions:

  • Substance P is a normal constituent of human tears.
  • Tear SPLI levels may serve as a biomarker for ocular surface denervation.
  • Enzymatic degradation of SP in tears balances its trophic effects and potential adverse impacts.