Virsuses: Human Immunodeficiency Syndrome & Acquired Immunodeficiency Syndrome

1. Virsuses:Human Immunodeficiency Syndrome& Acquired Immunodeficiency Syndrome

2. Outlinewe may need to save some topic in lecture Origins of HIV based on scientific evidence HIV viral particle Mechanism of infection • Transmission • Treatment • AIDS • Prevention • Clinical Detection and Diagnosis: you will learn one of these techiques in lab today.

3. Transmission of HIV

4. Transmission of HIV • Biological fluids • Blood • Sexual transmission (Semen) • Breast milk • Transplant tissues

5. Non-transmitting sources of HIV • Tears • Saliva • Mosquito or insects • Swimming pool • Food handling

7. Highly Active Antiretroviral Therapy (HAART)Cocktail Therapy

8. Examples of anti-retroviral drugs • Cocktail Drug Mixtures • Protease inhibitors • Non-nucleoside RT Inhibitors (NNRTIs) • Nuleoside/nucleotide RT inhibitors (NRTIs) • * Fusion Inhibitors *Fuzeon • Integrase Inhibitors • portmanteau inhibitor

9. Fusion Inhibitors block • Co-receptors on host cell • Gp120/gp 41 on viral particle or

10. Co-Receptors Binds naturally occurring chemokines CCR5 & CXCR4 (fusin)

11. Prevention • Condoms • Clean needles • Treatment of pregnant mother with anti-viral drugs • Blood screening • Abstinence

12. Acquired Immunodeficiency Disease

13. Symptoms of AIDS • Decrease T cell count • Rapid weight loss • Recurring fever and dry cough • Profound fatigue • Swollen lymph glands

14. Symptoms of AIDS • Persistent diarrhea • Unusual blemishes on the tongue, mouth, or throat • pneumonia • memory loss, depression

15. Acquired Immunodeficiency SyndromeOpportunistic Diseases and cancer • pneumonia • Kaposi’s Sarcoma Kaposi’s Sarcoma

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

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

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

19. Western Blot Identifies HIV proteins Protein ladder

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

21. Antibodies are proteins produced by our immune system that are directed against specific antigens.

22. Antibodies Antigens Immune system Non-self

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

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

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

29. 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).

30. 1 2 OraQuick Rapid Anti-HIV Blood Test 20 minute test Cost app. $15.00 3

31. Onto the ELISA lab

32. For Your Information and Files

33. Normal CD4+ count Normal CD4+ (%) AIDS 500-1600/mm3 20-40% <350/mm3 begin anti-viral treatment <14% serious immune damage Acquired Immunodeficiency Syndrome

36. Experimental drugs are italicized, and approved drugs are in regular, non-italicized type)

37. Interesting links on HIV • http://www.niaid.nih.gov/factsheets/aidsstat.htm • Links to global and US HIV/AIDS statistics • http://www.avert.org/pregnanc.htm • Links to HIV and pregnancy as well as numerous other links including statistics on global epidemic; HIV/AIDS quizzes and treatment. • http://www.cdc.gov/hiv/pubs/facts/transmission.htm • Links to CDC and a comprehensive fact sheet on HIV transmission

38. Experimental drugs are italicized, and approved drugs are in regular, non-italicized type)Brand NameGeneric NameAbbreviationExperimental Code Pharmaceutical Company Fuzeon™enfuvirtideENFT-20Trimeris and Hoffmann-La Roche    BMS-488043Bristol-Myers SquibbGSK-873,140GlaxoSmithKlinePRO-542Progenics PharmaceuticalsSCH-DSchering-Plough CorporationTNX-355Tanox and Biogen IdecUK-427,857Pfizer What are Entry Inhibitors (including Fusion Inhibitors)?Entry inhibitors work by preventing HIV from entering healthy T-cells in the body. They work differently than many of the approved anti-HIV drugs – the protease inhibitors (PIs), the nucleoside reverse transcriptase inhibitors (NRTIs), and the non-nucleoside reverse transcriptase inhibitors (NNRTIs) – which are active against HIV after it has infected a T-cell. Entry inhibitors work by attaching themselves to proteins on the surface of T-cells or proteins on the surface of HIV. In order for HIV to bind to T-cells, the proteins on HIV's outer coat must bind to the proteins on the surface of T-cells. Entry inhibitors prevent this from happening. Some entry inhibitors target the gp120 or gp41 proteins on HIV's surface. Some entry inhibitors target the CD4 protein or the CCR5 or CXCR4 receptors on a T-cell's surface. If entry inhibitors are successful in blocking these proteins, HIV is unable to bind to the surface of T-cells and gain entry into the cells. Only one entry inhibitor has been approved by the U.S. Food and Drug Administration (FDA): Fuzeon™ (T-20). This drug targets the gp41 protein on HIV's surface. Some experimental drugs target proteins on T-cells: BMS-488043 targets the gp120 protein, PRO-542 and TNX-355 target the CD4 protein, and SCH-D, GSK-873,140 and UK-427,857 target the CCR5 protein. HIV-positive people who have become resistant to PIs, NRTIs, and NNRTIs will likely benefit from the entry inhibitors because they are a different class of drugs. This is good news for HIV-positive people who have tried and failed many of the currently approved anti-HIV medications.To learn more on how HIV infects a T-cell and begins to create more viruses, and where each class of anti-HIV drugs blocks this process, click on the following lesson link:The HIV Life Cycle (and the targets of each class of anti-HIV drugs)