AIDS and Cancer
HIV replication and transmission; oncogenes, metastasis, detection and treatment of cancer. (Biology › Human Health and Disease, NEET UG syllabus.)
What is AIDS and Cancer?
A chronic, potentially life-threatening condition caused by the Human Immunodeficiency Virus (HIV), which damages the immune system, leading to increased susceptibility to opportunistic infections and certain cancers.
Key points
- Describe the causative agent, mode of transmission, and symptoms of AIDS.
- Explain the mechanism of HIV replication and its impact on the human immune system.
- Outline methods for prevention, diagnosis, and treatment of HIV/AIDS.
- Differentiate between benign and malignant tumors based on their characteristics.
Common exam trap
Confusing HIV (the virus) with AIDS (the syndrome).
Definitions
- Term
AIDS (Acquired ImmunoDeficiency Syndrome)
- Meaning
A chronic, potentially life-threatening condition caused by the Human Immunodeficiency Virus (HIV), which damages the immune system, leading to increased susceptibility to opportunistic infections and certain cancers.
- Term
HIV (Human Immunodeficiency Virus)
- Meaning
A retrovirus that primarily infects helper T-lymphocytes, leading to the progressive destruction of the immune system and eventually AIDS.
- Term
Retrovirus
- Meaning
A type of RNA virus that inserts a DNA copy of its genome into the host cell in order to replicate, using an enzyme called reverse transcriptase.
- Term
Reverse Transcriptase
- Meaning
An enzyme produced by retroviruses (like HIV) that catalyzes the synthesis of DNA from an RNA template.
- Term
Opportunistic Infections
- Meaning
Infections that occur more frequently and are more severe in individuals with weakened immune systems, such as those with AIDS.
- Term
Cancer
- Meaning
A disease characterized by the uncontrolled growth and spread of abnormal cells, which can form tumors and invade other parts of the body.
- Term
Tumor (Neoplasm)
- Meaning
An abnormal mass of tissue that forms when cells grow and divide more than they should or do not die when they should.
- Term
Benign Tumor
- Meaning
A non-cancerous tumor that does not invade surrounding tissue or spread to other parts of the body.
- Term
Malignant Tumor
- Meaning
A cancerous tumor that can invade surrounding tissues and metastasize (spread) to distant parts of the body.
- Term
Metastasis
- Meaning
The process by which cancer cells spread from their original site to other parts of the body, forming secondary tumors.
- Term
Carcinogens
- Meaning
Agents (physical, chemical, or biological) that can cause cancer.
- Term
Oncogenes
- Meaning
Genes that, when activated, can transform a normal cell into a cancer cell. They are often mutated forms of proto-oncogenes.
- Term
Proto-oncogenes
- Meaning
Normal genes that regulate cell growth and differentiation, but can become oncogenes if mutated or overexpressed.
- Term
Tumor Suppressor Genes
- Meaning
Genes that protect a cell from one step on the path to cancer by regulating the cell cycle and inhibiting cell proliferation (e.g., p53, Rb).
- Term
Contact Inhibition
- Meaning
The natural process of arresting cell growth when cells come into contact with each other, a property lost by cancer cells.
Learning objectives
Describe the causative agent, mode of transmission, and symptoms of AIDS.
Explain the mechanism of HIV replication and its impact on the human immune system.
Outline methods for prevention, diagnosis, and treatment of HIV/AIDS.
Differentiate between benign and malignant tumors based on their characteristics.
Identify various types of carcinogens and explain their role in cancer development.
Explain the process of metastasis and its significance in cancer progression.
Describe common methods for cancer detection and diagnosis.
Discuss various treatment modalities for cancer, including their principles.
Prerequisites
Basic understanding of the human immune system and its components (e.g., T-cells, B-cells).
Knowledge of cell division (mitosis and the cell cycle).
Basic understanding of viruses and their general replication mechanisms.
Familiarity with DNA and RNA structure and function.
Basic concepts of genetics, including mutations.
Common mistakes
Confusing HIV (the virus) with AIDS (the syndrome).
Believing AIDS can be cured, rather than managed.
Misunderstanding the modes of HIV transmission (e.g., thinking it spreads by casual contact).
Confusing benign and malignant tumors, especially regarding the ability to metastasize.
Not knowing the specific cell type targeted by HIV (helper T-cells).
Forgetting the role of reverse transcriptase in HIV replication.
Mixing up the causes of cancer (carcinogens) with the genetic mechanisms (oncogenes, tumor suppressor genes).
Keywords
HIV
AIDS
Retrovirus
Reverse Transcriptase
Helper T-cells
ELISA
Western Blot
ART
Cancer
Tumor
Benign
Malignant
Metastasis
Carcinogens
Oncogenes
Proto-oncogenes
Tumor Suppressor Genes
Radiotherapy
Chemotherapy
Immunotherapy
Practice preview
What is the genetic material of Human Immunodeficiency Virus (HIV)?…
easy
Normal cells have genes called proto-oncogenes, which when activated under certain conditions, can transform into cancer-causing genes called:…
easy
Which of the following is NOT a mode of transmission for HIV?…
easy