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Hemocytic encapsulation of implants in the tick Dermacentor variabilis.

Authors
Type
Published Article
Journal
Experimental and Applied Acarology
0168-8162
Publisher
Springer-Verlag
Publication Date
Volume
9
Issue
3-4
Pages
279–287
Identifiers
PMID: 2261820
Source
Medline

Abstract

Implants of Epon, inserted in Dermacentor variabilis (Say) through incisions in the cuticle, were encapsulated by hemocytes. We followed this process at intervals of 1,3,6, 12 and 24 h, and every 24 h thereafter up to 120 h. Degranulation of Type 1 granulocytes and coagulation of hemolymph were first seen at 1 h after implantation and were the earliest evidence of encapsulation. By 3 h after implantation, the degranulation and disintegration of granulocytes had formed a matrix at the Epon surface. From 6 h until encapsulation was completed, plasmatocytes and granulocytes continued to respond to degranulation and formed multiple cell layers around the Epon implant. The capsule was complete at 72 h after implantation. Completion was marked by decreasing degranulation, migration of hemocytes from the outermost layers of the capsule, and by the appearance of loosely attached hemocytes on the outer surface of the capsule. The most common junctional complex observed was gap junctions.

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