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Virsuses: Human Immunodeficiency Syndrome & Acquired Immunodeficiency Syndrome

Virsuses: Human Immunodeficiency Syndrome & Acquired Immunodeficiency Syndrome. Outline. Introductory Comments Virus versus bacteria Examples of DNA and RNA containing viruses How RNA containing viruses can replicate Origins of HIV Dr. Hahn and colleagues Characteristics of HIV Particle

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Virsuses: Human Immunodeficiency Syndrome & Acquired Immunodeficiency Syndrome

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  1. Virsuses:Human Immunodeficiency Syndrome& Acquired Immunodeficiency Syndrome

  2. Outline • Introductory Comments • Virus versus bacteria • Examples of DNA and RNA containing viruses • How RNA containing viruses can replicate • Origins of HIV • Dr. Hahn and colleagues • Characteristics of HIV Particle • Glycoproteins • Viral genes • Laboratory Diagnostic Tests • PCR • Western Blot • ELISA • -------------------------------------------------- Part 2 ------------------------- • Treatment • Transmission • Prevention

  3. Bacteria versus Viruses

  4. Note: These STDs are bacterial infections! • SYPHILIS • Bacterium: Treponema pallidum • GONORRHEA • Bacterium: Neisseria gonorrhoeae

  5. Viruses • DNA containing • RNA containing

  6. DNA containing viruses • Herpes virus • Small pox virus • Hepatitis B • adenovirus

  7. RNA containing viruses • Hepatitis A and C • Rabies • Ebola • Measles • Mumps • Polio • HIV Rabies virus Measles on the back

  8. HIV

  9. Examples of how RNA viruses replicate Negative strand Positive strand Retro

  10. RETROVIRAL REPLICATION

  11. HUMAN IMMUNODEFICIECY VIRUS • Family: retrovirus • Genus: lentivirus • Species: HIV 1 and HIV 2 • Groups and Subtypes: variety

  12. Africa Americas China (southeast) Europe India Japan Thailand A;D;C B C B C B E “Predominant Subtypes of Group M”

  13. Dr. Beatrice Hahn & colleagues: Drs. Li and Keele

  14. Greater spot nose monkey Red Cap Mangabey monkey SIV cpz almost identical to HIV 1 Humans

  15. Pan troglodytes troglodytes Simian Virus (SIV cpz) almost identical to HIV 1

  16. Sooty mangabey monkey Simian Virus corresponds to HIV2

  17. HIV: Structure and mechanism of replication

  18. HIV-1 PARTICLE

  19. HIV Glycoproteins • Lipid Bilayer contains glycoproteins • Gp 160 • Gp 120 • Gp 41

  20. T lymphocyte in green and HIV in red

  21. HOST CELLS:helper T lymphocyte, macrophages HIV and helper T cells HIV-1 http://highered.mcgraw-hill.com/sites/0072495855/student_view0/chapter24/animation__hiv_replication.html

  22. Budding of HIV from T lymphocyte HIV HIV

  23. Mechanism of Infection Infects Th cell VIRAL RNA Integrates into host DNA “activated” PROVIRAL DNA LYTIC STAGE storage LYSOGENIC STAGE

  24. Co-Receptors Binds naturally occurring chemokines CCR5 or CXCR4 (fusin)

  25. LYTIC STAGE

  26. The key HIV genes

  27. HIV Diagnostic Tests • Western Blot • PCR Directly measures HIV

  28. Polymerase Chain Reaction • Measures proviral DNA within the host DNA

  29. Western Blot Identifies HIV proteins Protein ladder

  30. HIV Diagnostic Tests • ELISA measures Indirect evidence of HIV exposure

  31. Enzyme Linked Immunosorbent Assay (ELISA) • A diagnostic test for Antibodies to HIV Antibodies

  32. *Antibodies are proteins produced by our immune system that are directed against specific antigens.(Antibody interactions with antigens will also be discussed in our “immungenetics lecture”)

  33. Antibodies Antigens Immune system Non-self

  34. Now apply these concepts to the diagnostic test known as ELISA to detect antibodies against HIV from a biologic fluid.

  35. Do any of these individuals carry antibodies to HIV?

  36. ELISA MICROTITER PLATES Microtiter plate

  37. The ELISA protocol sample Labelled 2nd Ab antigen 3 2 1 4 Color inducing substrate

  38. Results POSITIVE ANTI-HIV COLOR CHANGE NEGATIVE ANTI-HIV NO COLOR CHANGE

  39. FDA Approves Saliva OraQuick Rapid Test for HIV-1, HIV-2 Antibodies[March 29, 2004] (similar test is also available for blood samples, see next slides).

  40. 1 2 OraQuick Rapid Anti-HIV Blood Test 20 minute test Cost app. $15.00 3

  41. Outline • Introductory Comments • Virus versus bacteria • Examples of DNA and RNA containing viruses • How RNA containing viruses can replicate • Origins of HIV • Dr. Hahn and colleagues • Characteristics of HIV Particle • Glycoproteins • Viral genes • Laboratory Diagnostic Tests • PCR • Western Blot • ELISA • -------------------------------------------------- Part 2 ------------------------- • Treatment • Transmission • Prevention

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