Open Access

ARTICLE

Protein detection in spermatids and spermatozoa of the butterfly Euptoieta hegesia (Lepidoptera)

KARINA MANCINI, HEIDI DOLDER

Departamento de Biologia Celular, Instituto de Biologia, Universidade Estadual de Campinas, Campinas/SP, Brasil.
Address correspondence to: Dra. Karina Mancini. Departamento de Biología Celular, Instituto de Biología, CP 6109, Universidade Estadual de Campinas. 13084-971, Campinas/SP, BRASIL. FAX: (+55-19) 37886111. E-mail: kazinhamancini@yahoo.com.br or heidi@unicamp.br

BIOCELL 2004, 28(3), 299-310. https://doi.org/10.32604/biocell.2004.28.299

Abstract

This study was undertaken to detect protein components in both sperm types of the butterfly Euptoieta hegesia. These spermatozoa possess complex extracellular structures for which the composition and functional significance are still unclear. In the apyrene sperm head, the proteic cap presented an external ring and an internal dense content; basic proteins were detected only in external portions. In the tail, the paracrystalline core of mitochondrial derivatives and the axoneme are rich in proteins. The extratesticular spermatozoa are covered by a proteic coat, which presented two distinct layers. In eupyrene spermatozoa, acrosome and nucleus were negatively stained, probably because of their high compaction. In the tail, there is no paracrystalline core and the axoneme presented a very specific reaction for basic proteins. The lacinate and reticular appendages are composed of cylindrical sub-units and presented a light reaction to E-PTA and a strong reaction to tannic acid. A complex proteic coat also covers the extratesticular spermatozoa. We found similarities between both extratesticular coats, indicating a possible common origin. Both spermatozoon types are rich in proteins, especially the eupyrene appendages and the extratesticular coats. We believe that both coats are related to the sperm maturation and capacitation processes.

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