Search PubMed⌕ Search

Biomedical subjects

D Jachertz

Publications and source records attributed to D Jachertz.

13 recordsLinked to original sources
PubMed1984

Nude mice injected with DNA released by antigen stimulated human T lymphocytes produce specific antibodies expressing human characteristics.

Nude mice were injected with DNA purified from the nucleoprotein complex released by T lymphocytes previously exposed in vitro to inactivated herpes or poliovirus. After five days the serum of these mice was tested for its virus neutralizing activity. Results show that injected nude mice synthesize antiherpetic or antipolio antibodies depending on the antigen used to sensitize the T lymphocytes in vitro. These antibodies were not found in the serum of uninjected control mice or mice injected with inactivated herpes or polio viruses. Mice injected with DNA released by human T cells produced antibodies carrying human allotypes since they could be neutralized by anti-allotype sera. Moreover their antiviral activity was inhibited by anti-human IgM or IgG. However, the mice which were injected with DNA released by antigen stimulated murine T lymphocytes produced antiviral antibodies which were not neutralized by anti-human allotype sera.

Animals↗
PubMed1980

[Transfer of information from T and B lymphocytes during immune response: role of extracellular DNA].

Human lymphocytes obtained from donors exhibiting different allotypes were separated into B and T subpopulations and cultured in presence or in absence of UV-inactivated Herpes simplex virus. Isolated B or T cells did not produce antiherpetic activity. The B lymphocytes, cultured in presence of the supernatant collected from virus exposed T cells or in the presence of DNA extracted from this supernatant, synthesized an antiherpetic antibody carrying allotypic markers of the T cell donor.

Antibody Specificity↗
PubMed1980

The role of extracellular DNA in the transfer of information from T to B human lymphocytes in the course of an immune response.

Human lymphocytes obtained from donors exhibiting different allotypes were separated into B- and T-enriched subpopulations and cultured in the presence or absence of Herpes simplex virus inactivated by U.V. Isolated B or T cell suspensions did not produce any antiherpetic activity. The B lymphocytes cultured in the presence of the supernatant collected from virus-exposed T cells or in the presence of DNA extracted from this supernatant, synthesized an antiherpetic antibody carrying allotypic markers of the T cell donor.

Antibody Formation↗
PubMed1979

[Transfer of genetic information from T to B human lymphocytes during an immune response to herpes simplex virus].

Human blood lymphocytes carrying different allotypes were divided into B and T subpopulations and cultured in presence or in absence of ultraviolet inactivated Herpes Simplex Virus. Isolated B or T cells did not produce any antiherpetic activity. The B lymphocytes cultured in presence of 1 or 50% of the supernatant collected from virus exposed T cells synthesized on antiherpetic antibody with some allotypic markers of the T cell donor.

Antibodies, Viral↗
PubMed1979

Gene activation during immune reaction.

In cell-free systems the addition of antigen stimulates the synthesis of informational RNA (i-RNA) which exhibits the following properties: It codes for the entire antibody molecule, it codes for the synthesis of regulator protein which initiates transcription of i-RNA with the correspondent informational content from DNA, it is a template for an an i-RNA dependent RNA polymerase, it is a template for an i-RNA dependent reverse transcriptase. The i-RNA may exist in a state of latency in cells. The product of reverse transcription of i-RNA is i-DNA which can be used to transcribe further i-RNA of the same specificity. Similar to i-DNA is an extracellular DNA which codes also for antibody and from which i-RNA can be transcribed. The data presented are summarized in a scheme of the flow of information during immunological reactions. It could be shown that there exist three different types of extrachromosomally synthesized molecules--i-RNA, i-DNA and extracellular DNA--which bear immunological specific information. These extrachromosomal states of information may be relevant for the generation of antibody diversity.

Animals↗
PubMed1979

Information carried by the DNA released by antigen-stimulated lymphocytes.

Both antigen-stimulated and non-stimulated human blood lymphocytes release in vitro a DNA-containing complex which is not the product of dying or disintegrating cells. Lymphocytes obtained from different PPD or HBs positive or negative donors were incubated with one of these antigens and the DNA released in the culture medium was tested for its information content using, successively, two cell-free systems. The ability of the resulting protein product to bind specifically to the stimulating antigen was examined by immunoadsorption chromatography. Results show that DNA excreted by stimulated lymphocytes was transcribed into an RNA which coded for an antigen-binding protein, whereas DNA released by unstimulated lymphocytes did not. The protein produced in this system, using as template the DNA released after cell stimulation, bound specifically to PPD or HBs Sepharose 4B coated columns, depending on the stimulating antigen and on the cell response to this antigen. After elution from the column the protein sedimented at 19S in a linear sucrose gradient.

Antibody Formation↗