AIDS and the HIV Life Cycle

Aids and HIV Life cycle lecture was given by Dr.Bruce Walker ,He is Howard Hughes Medical Institute Investigator,and Director for Center for AIDS Research at Harvard University.The lecture starts from HIV structure , various component of HIV virus,Mechanism of HIV , and how HIV causes AIDS,He also talks about why our immune system is unable to stop HIV virus.The lecture uses various case studies of show HIV variability,he also talk about various challenges for designing drugs for HIV .

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This lecture explain about HIV manifestation,
  • Hiv was first found among few gay persons in califonia,it later spread all aroung USA,
  • This virus are essentially packages of genetic material and are not able to replicate on their won ,But they carry all the information acquired for replication
  • if you had chickenpox or infectious mono as child you have that virus still alive in your body now the reason it's not causing diseases that you have an effective immune response that it will help you to keep it in check now
  • when you first became infected with chickenpox you felt really lousy .The part of that feeling of lousy as your immune system trying to respond and fight the invading pathogen and ultimately even though the virus persists in your body you enter into a phase where your a symptomatic and the virus is not causing any problems again with immune system keeping in check
  • Early symptoms for Aids Patient had fever, chills, shaking, Headache at times loss of appetite joint and muscle pain and malaise skin rashes,and swollen lymph nodes .
  • It takes more than 3 weeks produce Hiv Antibody
  • polymerase chain reaction helps to directly quantitative the amount of virus in the bloodstream
  • people have a transient drop in Cd4 helper cell counts and then T-helper cell levels decline slowly over time until the ultimate development of AIDS.
  • HIV it's a typical retrovirus ,meaning that it has in outer envelope. in the center it has two copies of RNA as well as an reverse transcriptase Enzyme, which will ultimately turn that RNA into DNA,
  • The first step in HIV1 life cycle is viral attachment to the CD4 T-cell surface the next step is viral entry which involves a cascade of molecular interactions between the viral envelope glycoprotein and Two T-cell surface receptors a primary receptor and a co-receptor.
  • The GP 120 subunit of the envelope protein first binds the CD4 primary receptor this induces a conformational change in GP 120 This allows to binds to the co- receptor binding triggers conformational changes in the GP 41 subunit leading to insertion of its N-terminal fusion peptide into the host cell's membrane

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