[Incorporation of tritiated thymidine into testicular deoxyribonucleic acid of the rat. Effect of inhibin]. 1979

R Bologne, and A Demoulin, and J Hustin, and J Verstraelen-Proyard, and P Gysen, and P Franchimont

tritiated thymidine is incorporated into DNA of spermatogonia type B as proved by autohistoradiography when injected in vivo three hours before the sacrifice. Maximum binding and specific activity (labelled thymidine expressed in DPM per mg DNA) are obtained in pubertal rats aged 42 days and weighting 150 g. Inhibin preparation extracted from rete testis fluid (RTF3) specifically inhibits tritiated thymidine into testicular DNA. Thus, no modification of incorporation into hepatic DNA is observed and the preparation loses its inhibitory effect when denatured by heating and trypsin digestion. Tritiated thymidine incorporation into testicular DNA is poor in normal adult rats and in pubertal hypophysectomized animals, RTF3 does not modify the thymidine incorporation in both conditions. The reasons for this lack of effect are discussed. An experimental condition of spermatogonial regeneration is obtained by testicular irradiation. Inhibin preparation inhibits the regenerative DNA synthesis.

UI MeSH Term Description Entries
D007016 Hypophysectomy Surgical removal or destruction of the hypophysis, or pituitary gland. (Dorland, 28th ed) Hypophysectomies
D008297 Male Males
D011506 Proteins Linear POLYPEPTIDES that are synthesized on RIBOSOMES and may be further modified, crosslinked, cleaved, or assembled into complex proteins with several subunits. The specific sequence of AMINO ACIDS determines the shape the polypeptide will take, during PROTEIN FOLDING, and the function of the protein. Gene Products, Protein,Gene Proteins,Protein,Protein Gene Products,Proteins, Gene
D004247 DNA A deoxyribonucleotide polymer that is the primary genetic material of all cells. Eukaryotic and prokaryotic organisms normally contain DNA in a double-stranded state, yet several important biological processes transiently involve single-stranded regions. DNA, which consists of a polysugar-phosphate backbone possessing projections of purines (adenine and guanine) and pyrimidines (thymine and cytosine), forms a double helix that is held together by hydrogen bonds between these purines and pyrimidines (adenine to thymine and guanine to cytosine). DNA, Double-Stranded,Deoxyribonucleic Acid,ds-DNA,DNA, Double Stranded,Double-Stranded DNA,ds DNA
D000375 Aging The gradual irreversible changes in structure and function of an organism that occur as a result of the passage of time. Senescence,Aging, Biological,Biological Aging
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
D001345 Autoradiography The making of a radiograph of an object or tissue by recording on a photographic plate the radiation emitted by radioactive material within the object. (Dorland, 27th ed) Radioautography
D013735 Testicular Hormones Hormones produced in the testis. Hormones, Testicular
D013737 Testis The male gonad containing two functional parts: the SEMINIFEROUS TUBULES for the production and transport of male germ cells (SPERMATOGENESIS) and the interstitial compartment containing LEYDIG CELLS that produce ANDROGENS. Testicles,Testes,Testicle
D013936 Thymidine A nucleoside in which THYMINE is linked to DEOXYRIBOSE. 2'-Deoxythymidine,Deoxythymidine,2' Deoxythymidine

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