Login

Join for Free!
118322 members


How does your body get rid of viruses

Human Anatomy, Physiology, and Medicine. Anything human!

Moderator: BioTeam

How does your body get rid of viruses

Postby lazboy » Fri May 06, 2005 2:51 am

hey,
I need to do a Biology Report and need to know how your body gets rid of a virus or something else that is not meant to be in your body. Thanks in advance for the help :D
lazboy
Garter
Garter
 
Posts: 1
Joined: Fri May 06, 2005 2:47 am

Immnune System

Postby cytochromeP » Fri May 06, 2005 3:59 am

There are 2 types of Immune Responses : Cell mediated and Humoral

1. Humoral: Here we have plasma cells secreting Anti-bodies specific to the pathogen. These antibodies complex with their specific antigens present on the pathogen and precipitate it out of the circulation. Such immune-complexes will then be cleared out completely with the help of 'complement' and phagocytic macrophages.

2. Cell-mediated: Here cytotoxic T lymphocytes are involved. These cells prevent the intracellular replication of viruses by releasing special chemicals called Interferons.

In general:

Viral infection, fungal infection => T cells
Bacterial infection => Plasma cells

Ref: 1. Immunology by Janus Kuby
2. Immunology by Tizzard
Know thyself.
User avatar
cytochromeP
Death Adder
Death Adder
 
Posts: 73
Joined: Wed Apr 06, 2005 2:17 pm
Location: Third Rock From The Sun

Postby MrMistery » Fri May 06, 2005 6:45 pm

Ever wondered why your body can not fight the HIV virus? It is because it keeps changing it's proteic lare and the antibodies do not recognise it by the time they get there.
But i will find the cure for AIDS!
"As a biologist, I firmly believe that when you're dead, you're dead. Except for what you live behind in history. That's the only afterlife" - J. Craig Venter
User avatar
MrMistery
Inland Taipan
Inland Taipan
 
Posts: 6832
Joined: Thu Mar 03, 2005 10:18 pm
Location: Romania(small and unimportant country)


Postby biostudent84 » Fri May 06, 2005 10:49 pm

Offtopic: Did you know that the American KKK wants to throw everyone with AIDS into a form of concentration camp to keep it from spreading? Bleh...

Back on topic: Don't forget that you get a fever. A fever is a response to pathogens inside the human body. What it is trying to do is denature the proteins in the pathogens. Unfortunately, it only works if the denaturing tempureate of the pathogen is lower than that of the human body (estimated around 106* F).

Kyle
User avatar
biostudent84
Site Admin
Site Admin
 
Posts: 974
Joined: Thu Nov 11, 2004 6:00 am
Location: Farmville, VA

Postby Dr.Stein » Sun Jul 10, 2005 11:33 am

Humoral immune response only works to remove viral infection when the virus is still outside of the cell. When the virus already comes inside the cell, the virus-infected cell will process the viral peptides to express modified MHC-I (due to the present of foreign peptides of virus) on its surface to be recognized by CD8+ T-cell (CTL), in which it will kill the cell by cytotoxic activitiy. Also, the activated T-cell will release specific cytokine (interferon) that can induce cells to resist viral replication.

Why HIV cannot easily eradicated from cells? Because it infects immune cell (CD4+), which function to help B-cell for maturation to differentiate into plasma cells and memory cells. Now CD4+ even helps HIV to proliferate. It is terrible, cell that should protects our body from the infection now helps our enemy to kill ourself! :(
Image
User avatar
Dr.Stein
King Cobra
King Cobra
 
Posts: 3501
Joined: Thu Jul 07, 2005 7:58 am
Location: 55284 Yogyakarta, Indonesia

Postby victor » Sun Jul 10, 2005 12:54 pm

That's a betrayer in our body...that's so complex Dr.Stein... :roll: all the thing that I know about immune system is the cell is using restrict endonucleasm enzyme to cut out virus's protein and making the virus non-active...
Q: Why are chemists great for solving problems?
A: They have all the solutions.
User avatar
victor
King Cobra
King Cobra
 
Posts: 2668
Joined: Sat Apr 30, 2005 12:01 pm
Location: Yogyakarta, Indonesia..

Postby chemistry_freako » Sun Jul 10, 2005 2:07 pm

yea - restriction endonucleases are also involved sometimes in cell immunity defence =D
化学は、最高です

Image
User avatar
chemistry_freako
Coral
Coral
 
Posts: 193
Joined: Wed Jun 08, 2005 3:31 pm
Location: Somewhere between those molecules

Postby Dr.Stein » Tue Jul 12, 2005 3:44 am

victor wrote:That's a betrayer in our body...that's so complex Dr.Stein... :roll: all the thing that I know about immune system is the cell is using restrict endonucleasm enzyme to cut out virus's protein and making the virus non-active...

Yes, it is only one of several mechanisms for cells to anticipate viral infection. Before the mechanism takes place, viral DNA is already fused to host's DNA and hijack it. Virus is much clever nowadays :lol: even the 'old' one: influenza, "the master of virus", still cannot be eradicated up to now like its colleague, the vaccinia :D
Image
User avatar
Dr.Stein
King Cobra
King Cobra
 
Posts: 3501
Joined: Thu Jul 07, 2005 7:58 am
Location: 55284 Yogyakarta, Indonesia

Postby victor » Tue Jul 12, 2005 11:42 am

Guess we must make a better molecular scissor....
Q: Why are chemists great for solving problems?
A: They have all the solutions.
User avatar
victor
King Cobra
King Cobra
 
Posts: 2668
Joined: Sat Apr 30, 2005 12:01 pm
Location: Yogyakarta, Indonesia..

Postby James » Tue Jul 12, 2005 2:33 pm

Maybe nanotechnology will one day fight viruses for us.
User avatar
James
King Cobra
King Cobra
 
Posts: 552
Joined: Wed Feb 23, 2005 11:00 pm
Location: England

Postby Dr.Stein » Wed Jul 13, 2005 9:48 am

Perhaps we need to give more education to lymphocytes and APCs to recognize all peptides from those clever viruses, so whatever and however they change such gene expression, our system will recognize it much better and faster :D
Image
User avatar
Dr.Stein
King Cobra
King Cobra
 
Posts: 3501
Joined: Thu Jul 07, 2005 7:58 am
Location: 55284 Yogyakarta, Indonesia

Postby victor » Thu Jul 14, 2005 12:24 pm

Before Lymphocytes recognize the virus...the virus has already translate it's own RNA and make lymphocytes died... :lol:
Q: Why are chemists great for solving problems?
A: They have all the solutions.
User avatar
victor
King Cobra
King Cobra
 
Posts: 2668
Joined: Sat Apr 30, 2005 12:01 pm
Location: Yogyakarta, Indonesia..

Next

Return to Human Biology

Who is online

Users browsing this forum: No registered users and 0 guests