Biomaterial Database

Extra-Golgi pathway of an acrosomal antigen during spermiogenesis in the rat. 1992

I Tanii, and K Toshimori, and S Araki, and C Oura

Department of Anatomy, Miyazaki Medical College, Japan.

A monoclonal antibody (MC41) was produced that specifically recognizes a sperm acrosomal antigen of approximately 165,000 dalton in the rat. Rat testis was examined using a pre-embedding immunoperoxidase technique to reveal the pathway of the MC41 antigen to the acrosome during spermiogenesis. The MC41 immunoreaction appeared in several organelles of spermatids in a stage-specific manner: (1) in the endoplasmic reticulum (ER) throughout spermiogenesis, (2) in the outer acrosomal membrane from steps 9 to 19, (3) as a weak immunoreaction in the vesicular structures in the acrosomal matrix from steps 11 to 17, and (4) as a strong immunoreaction in the acrosomal matrix especially at the terminal step of spermiogenesis (step 19). However, no immunoreaction was observed in the Golgi region throughout spermiogenesis. These results suggest that the pathway of the MC41 antigen leads firstly from the ER to the outer acrosomal membrane and secondly to the acrosomal matrix. This pathway does not involve the Golgi apparatus and is referred to as the "extra-Golgi pathway".

UI	MeSH Term	Description	Entries
D007150	Immunohistochemistry	Histochemical localization of immunoreactive substances using labeled antibodies as reagents.	Immunocytochemistry,Immunogold Techniques,Immunogold-Silver Techniques,Immunohistocytochemistry,Immunolabeling Techniques,Immunogold Technics,Immunogold-Silver Technics,Immunolabeling Technics,Immunogold Silver Technics,Immunogold Silver Techniques,Immunogold Technic,Immunogold Technique,Immunogold-Silver Technic,Immunogold-Silver Technique,Immunolabeling Technic,Immunolabeling Technique,Technic, Immunogold,Technic, Immunogold-Silver,Technic, Immunolabeling,Technics, Immunogold,Technics, Immunogold-Silver,Technics, Immunolabeling,Technique, Immunogold,Technique, Immunogold-Silver,Technique, Immunolabeling,Techniques, Immunogold,Techniques, Immunogold-Silver,Techniques, Immunolabeling
D008297	Male		Males
D008970	Molecular Weight	The sum of the weight of all the atoms in a molecule.	Molecular Weights,Weight, Molecular,Weights, Molecular
D004721	Endoplasmic Reticulum	A system of cisternae in the CYTOPLASM of many cells. In places the endoplasmic reticulum is continuous with the plasma membrane (CELL MEMBRANE) or outer membrane of the nuclear envelope. If the outer surfaces of the endoplasmic reticulum membranes are coated with ribosomes, the endoplasmic reticulum is said to be rough-surfaced (ENDOPLASMIC RETICULUM, ROUGH); otherwise it is said to be smooth-surfaced (ENDOPLASMIC RETICULUM, SMOOTH). (King & Stansfield, A Dictionary of Genetics, 4th ed)	Ergastoplasm,Reticulum, Endoplasmic
D000177	Acrosome	The cap-like structure covering the anterior portion of SPERM HEAD. Acrosome, derived from LYSOSOMES, is a membrane-bound organelle that contains the required hydrolytic and proteolytic enzymes necessary for sperm penetration of the egg in FERTILIZATION.	Acrosomes
D000818	Animals	Unicellular or multicellular, heterotrophic organisms, that have sensation and the power of voluntary movement. Under the older five kingdom paradigm, Animalia was one of the kingdoms. Under the modern three domain model, Animalia represents one of the many groups in the domain EUKARYOTA.	Animal,Metazoa,Animalia
D000911	Antibodies, Monoclonal	Antibodies produced by a single clone of cells.	Monoclonal Antibodies,Monoclonal Antibody,Antibody, Monoclonal
D000941	Antigens	Substances that are recognized by the immune system and induce an immune reaction.	Antigen
D001692	Biological Transport	The movement of materials (including biochemical substances and drugs) through a biological system at the cellular level. The transport can be across cell membranes and epithelial layers. It also can occur within intracellular compartments and extracellular compartments.	Transport, Biological,Biologic Transport,Transport, Biologic
D013087	Spermatids	Male germ cells derived from the haploid secondary SPERMATOCYTES. Without further division, spermatids undergo structural changes and give rise to SPERMATOZOA.	Spermatoblasts,Spermatid,Spermatoblast