author_facet Jakobsen, Per Ploug
Suhr-Jessen, Peter
Jakobsen, Per Ploug
Suhr-Jessen, Peter
author Jakobsen, Per Ploug
Suhr-Jessen, Peter
spellingShingle Jakobsen, Per Ploug
Suhr-Jessen, Peter
Biological Bulletin
The Horseshoe Crab Tachypleus tridentatus Has Two Kinds of Hemocytes: Granulocytes and Plasmatocytes
Physiology
author_sort jakobsen, per ploug
spelling Jakobsen, Per Ploug Suhr-Jessen, Peter 0006-3185 Marine Biological Laboratory Physiology https://www.jstor.org/stable/1541537 <p>For the first time, the fine structure of the hemocytes from the horseshoe crab Tachypleus tridentatus is investigated by transmission electron microscopy and light microscopy serial sectioning. Two morphologically distinct, ellipsoidal, and mononucleate hemocytes-granulocytes (amebocytes) and plasmatocytes-are revealed. Granulocytes constitute about 97% of the hemocytes. They have a marginal band of microtubules, a heterochromatic nucleus, distended but poorly developed RER, few free ribosomes, few mitochondria, and many large secretory granules. The majority of these granules have a uniform content and are mature. Structured granules located in the proximity of Golgi complexes may be immature transitional stages leading to the mature uniform granules. Upon stimulation with endotoxin from gram negative bacteria, the mature granules become transitory structured before exocytosis. In contrast, the immature granules are not exocytosed. Plasmatocytes constitute about 3% of the hemocytes. They differ from granulocytes by having an euchromatic nucleus, a well-developed RER of flattened or tubular cisternae, many free ribosomes, many mitochondria, but only few, if any, large secretory granules. Apparently, plasmatocytes are not affected by endotoxin. The relationship and possible functions of granulocytes and plasmatocytes are discussed and compared with those of the horseshoe crab, Limulus polyphemus.</p> The Horseshoe Crab Tachypleus tridentatus Has Two Kinds of Hemocytes: Granulocytes and Plasmatocytes Biological Bulletin
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title The Horseshoe Crab Tachypleus tridentatus Has Two Kinds of Hemocytes: Granulocytes and Plasmatocytes
title_unstemmed The Horseshoe Crab Tachypleus tridentatus Has Two Kinds of Hemocytes: Granulocytes and Plasmatocytes
title_full The Horseshoe Crab Tachypleus tridentatus Has Two Kinds of Hemocytes: Granulocytes and Plasmatocytes
title_fullStr The Horseshoe Crab Tachypleus tridentatus Has Two Kinds of Hemocytes: Granulocytes and Plasmatocytes
title_full_unstemmed The Horseshoe Crab Tachypleus tridentatus Has Two Kinds of Hemocytes: Granulocytes and Plasmatocytes
title_short The Horseshoe Crab Tachypleus tridentatus Has Two Kinds of Hemocytes: Granulocytes and Plasmatocytes
title_sort the horseshoe crab tachypleus tridentatus has two kinds of hemocytes: granulocytes and plasmatocytes
topic Physiology
url https://www.jstor.org/stable/1541537
publishDate 1990
physical 55-64
description <p>For the first time, the fine structure of the hemocytes from the horseshoe crab Tachypleus tridentatus is investigated by transmission electron microscopy and light microscopy serial sectioning. Two morphologically distinct, ellipsoidal, and mononucleate hemocytes-granulocytes (amebocytes) and plasmatocytes-are revealed. Granulocytes constitute about 97% of the hemocytes. They have a marginal band of microtubules, a heterochromatic nucleus, distended but poorly developed RER, few free ribosomes, few mitochondria, and many large secretory granules. The majority of these granules have a uniform content and are mature. Structured granules located in the proximity of Golgi complexes may be immature transitional stages leading to the mature uniform granules. Upon stimulation with endotoxin from gram negative bacteria, the mature granules become transitory structured before exocytosis. In contrast, the immature granules are not exocytosed. Plasmatocytes constitute about 3% of the hemocytes. They differ from granulocytes by having an euchromatic nucleus, a well-developed RER of flattened or tubular cisternae, many free ribosomes, many mitochondria, but only few, if any, large secretory granules. Apparently, plasmatocytes are not affected by endotoxin. The relationship and possible functions of granulocytes and plasmatocytes are discussed and compared with those of the horseshoe crab, Limulus polyphemus.</p>
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author Jakobsen, Per Ploug, Suhr-Jessen, Peter
author_facet Jakobsen, Per Ploug, Suhr-Jessen, Peter, Jakobsen, Per Ploug, Suhr-Jessen, Peter
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container_title Biological Bulletin
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description <p>For the first time, the fine structure of the hemocytes from the horseshoe crab Tachypleus tridentatus is investigated by transmission electron microscopy and light microscopy serial sectioning. Two morphologically distinct, ellipsoidal, and mononucleate hemocytes-granulocytes (amebocytes) and plasmatocytes-are revealed. Granulocytes constitute about 97% of the hemocytes. They have a marginal band of microtubules, a heterochromatic nucleus, distended but poorly developed RER, few free ribosomes, few mitochondria, and many large secretory granules. The majority of these granules have a uniform content and are mature. Structured granules located in the proximity of Golgi complexes may be immature transitional stages leading to the mature uniform granules. Upon stimulation with endotoxin from gram negative bacteria, the mature granules become transitory structured before exocytosis. In contrast, the immature granules are not exocytosed. Plasmatocytes constitute about 3% of the hemocytes. They differ from granulocytes by having an euchromatic nucleus, a well-developed RER of flattened or tubular cisternae, many free ribosomes, many mitochondria, but only few, if any, large secretory granules. Apparently, plasmatocytes are not affected by endotoxin. The relationship and possible functions of granulocytes and plasmatocytes are discussed and compared with those of the horseshoe crab, Limulus polyphemus.</p>
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spelling Jakobsen, Per Ploug Suhr-Jessen, Peter 0006-3185 Marine Biological Laboratory Physiology https://www.jstor.org/stable/1541537 <p>For the first time, the fine structure of the hemocytes from the horseshoe crab Tachypleus tridentatus is investigated by transmission electron microscopy and light microscopy serial sectioning. Two morphologically distinct, ellipsoidal, and mononucleate hemocytes-granulocytes (amebocytes) and plasmatocytes-are revealed. Granulocytes constitute about 97% of the hemocytes. They have a marginal band of microtubules, a heterochromatic nucleus, distended but poorly developed RER, few free ribosomes, few mitochondria, and many large secretory granules. The majority of these granules have a uniform content and are mature. Structured granules located in the proximity of Golgi complexes may be immature transitional stages leading to the mature uniform granules. Upon stimulation with endotoxin from gram negative bacteria, the mature granules become transitory structured before exocytosis. In contrast, the immature granules are not exocytosed. Plasmatocytes constitute about 3% of the hemocytes. They differ from granulocytes by having an euchromatic nucleus, a well-developed RER of flattened or tubular cisternae, many free ribosomes, many mitochondria, but only few, if any, large secretory granules. Apparently, plasmatocytes are not affected by endotoxin. The relationship and possible functions of granulocytes and plasmatocytes are discussed and compared with those of the horseshoe crab, Limulus polyphemus.</p> The Horseshoe Crab Tachypleus tridentatus Has Two Kinds of Hemocytes: Granulocytes and Plasmatocytes Biological Bulletin
spellingShingle Jakobsen, Per Ploug, Suhr-Jessen, Peter, Biological Bulletin, The Horseshoe Crab Tachypleus tridentatus Has Two Kinds of Hemocytes: Granulocytes and Plasmatocytes, Physiology
title The Horseshoe Crab Tachypleus tridentatus Has Two Kinds of Hemocytes: Granulocytes and Plasmatocytes
title_full The Horseshoe Crab Tachypleus tridentatus Has Two Kinds of Hemocytes: Granulocytes and Plasmatocytes
title_fullStr The Horseshoe Crab Tachypleus tridentatus Has Two Kinds of Hemocytes: Granulocytes and Plasmatocytes
title_full_unstemmed The Horseshoe Crab Tachypleus tridentatus Has Two Kinds of Hemocytes: Granulocytes and Plasmatocytes
title_short The Horseshoe Crab Tachypleus tridentatus Has Two Kinds of Hemocytes: Granulocytes and Plasmatocytes
title_sort the horseshoe crab tachypleus tridentatus has two kinds of hemocytes: granulocytes and plasmatocytes
title_unstemmed The Horseshoe Crab Tachypleus tridentatus Has Two Kinds of Hemocytes: Granulocytes and Plasmatocytes
topic Physiology
url https://www.jstor.org/stable/1541537