Role of lectins in the innate immunity of horseshoe crab

Shun-Ichiro Kawabata, Sadaaki Iwanaga

Research output: Contribution to journalArticle

78 Citations (Scopus)

Abstract

We have purified five types of lectins, named tachylectins, from circulating hemocytes and hemolymph plasma of the Japanese horseshoe crab, Tachypleus tridentatus. Tachylectin-1 interacts with Gram-negative bacteria probably through 2-keto-3-deoxyoctonate, one of the constituents of lipopolysaccharides (LPS). Tachylectin-1 also binds to polysaccharides such as agarose and dextran with broad specificity. Tachylectin-2 binds to D- GlcNAc or D-GalNAc and recognizes staphylococcal lipoteichoic acids and LPS from several Gram-negative bacteria. In contrast, tachylectins-3 and -4 specifically bind to S-type LPS from several Gram-negative bacteria through a certain sugar moiety on the O-specific polysaccharides (O-antigens). Tachylectin-5 identified in hemolymph plasma has the strongest bacterial agglutinating activity in the five types of tachylectins, and exhibits broad specificity against acetyl group-containing substances. Thus, the innate immune system of horseshoe crab may recognize invading pathogens through a combinatorial method using lectins with different specificities against carbohydrates exposed on pathogens. An encounter of these lectins derived from hemocytes and hemolymph plasma at injured sites, in response to the stimulation of LPS, suggests that they serve synergistically to accomplish an effective host defense against invading microbes and foreign substances.

Original languageEnglish
Pages (from-to)391-400
Number of pages10
JournalDevelopmental and Comparative Immunology
Volume23
Issue number4-5
DOIs
Publication statusPublished - Jun 1 1999

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Horseshoe Crabs
Lectins
Innate Immunity
Lipopolysaccharides
Hemolymph
Gram-Negative Bacteria
Hemocytes
O Antigens
Dextrans
Sepharose
Polysaccharides
Immune System
Carbohydrates
Tachypleus plasma lectin-1

All Science Journal Classification (ASJC) codes

  • Immunology
  • Developmental Biology

Cite this

Role of lectins in the innate immunity of horseshoe crab. / Kawabata, Shun-Ichiro; Iwanaga, Sadaaki.

In: Developmental and Comparative Immunology, Vol. 23, No. 4-5, 01.06.1999, p. 391-400.

Research output: Contribution to journalArticle

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