Volume 46, Issue 5 pp. 507-515
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A Novel Healing Filament in Ciliate Regeneration

MARIA JERKA-DZIADOSZ

Corresponding Author

MARIA JERKA-DZIADOSZ

Polish Academy of Sciences, M. Nencki Institute of Experimental Biology, Department of Cell Biology, 3 Pasteur Str. 02–093 Warsaw, Poland

Corresponding Author. M. Jerka-Dziadosz—Telephone Number: (48-22) 668 62 48; FAX Number: (48-22) 822 53 42; Email: dziadosz@ nencki.gov.plSearch for more papers by this author
KATARZYNA MUSZYNSKA

KATARZYNA MUSZYNSKA

Polish Academy of Sciences, M. Nencki Institute of Experimental Biology, Department of Cell Biology, 3 Pasteur Str. 02–093 Warsaw, Poland

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WANDA KRAWCZYńSKA

WANDA KRAWCZYńSKA

Polish Academy of Sciences, M. Nencki Institute of Experimental Biology, Department of Cell Biology, 3 Pasteur Str. 02–093 Warsaw, Poland

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First published: 14 May 2007
Citations: 4

ABSTRACT

The interphase cells of the hypotrich ciliate Paraurostyla weissei possess a complex fibrillar system surrounding basal bodies in the compound ciliary assemblages, cirri and membranelles. During replacement of the ciliature at cell division, transient filaments precede and accompany the development of ciliary primordia and participate in the formation of the fission furrow. Both fibrillar systems are recognized by monoclonal antibody FXXXIX 12G9. We studied regeneration of cellular fragments after transection employing the mAb 12G9 and found a new cytoskeletal structure involved in healing of the excisional wound. The healing filament is formed at the wound edge, distally and in connection with the bases of cirri closest to the wound. It is visible 5 min after transection. Concomitant with development of new ciliary primordia, the healing filament shrinks and finally disappears together with other transient fibers formed in this process. Ultrastructural analysis of immunolabeled regenerating cells revealed that structures recognized by mAbl2G9 contain fine filaments whose packing and arrangement depends on accompanying cytoplasmic elements and the developmental status of a fragment. Assembly of the healing fiber does not depend on microtubules and microfilaments since it develops in cellular fragments exposed to cold, nocodazole, and Cytochalasin D. On Western blots of whole cell and cytoskeletal extracts of P. weissei the 12G9 antibody identified one protein band whose molecular weight corresponds to 60 kDa.

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