cell biology and biotechnology - cytology, stem cells, organ donation

I. Cytology (Cell Biology)

 Definition: Cytology is the branch of biology that studies the structure and organelles of the cell.

Scope: It includes the study of cell division and various other aspects of the cell.

 

Significance: There are revolutionary changes in the field of human health due to cell biology research.

II. Stem Cells

A. What are Stem Cells?

 Special Cells: Stem cells are special types of cells present in the body of multicellular organisms (like humans).

 

 Function: They give rise to all other types of cells and play an important role in wound healing.

 

Origin in Humans:

   * Zygote: The new organism starts as a zygote (formed by the union of male and female gametes).

   * Embryo: At the earliest stage of development, the organism is a mass of cells called the embryo. All the cells in this mass are almost alike and are called stem cells.

   * During further development, these cells form every type of cell, different types of tissues, and perform different functions in the body. This is called differentiation.

B. Types of Stem Cells (Based on Origin)

  Embryonic Stem Cells:

   * Origin: Derived from the embryo, which starts from the zygote.

   * Stage of Collection: Cells are collected from the embryo at about the 14^{\text{th}} day of conception, before differentiation begins.

   * Potential: These are pluripotent and can be transformed into almost all 220 different types of cells (e.g., nerve cells, liver cells, bone cells).

  Adult Stem Cells (Non-embryonic):

   * Origin: Found in the body of an adult person.

   * Examples: Collected from red bone marrow, adipose connective tissue (fat cells), and blood (like umbilical cord blood).

   * Potential: They are multipotent - they can mostly only form the same types of cells as the tissue they are in (e.g., bone marrow stem cells form blood cells).

C. Stem Cell Preservation

 Sources: Stem cells are collected from sources like:

   * Umbilical cord blood (of the fetus).

   * Bone marrow (red).

   * Embryo (blastocyst stage).

   * Adipose tissue.

 * Storage: They are stored in sterile vials and kept at an extremely low temperature (-135 to -190 ) using liquid nitrogen.

D. Uses of Stem Cells (Stem Cell Therapy)

 Regenerative Therapy:

   * Used to replace dead cells in conditions like:

     * Diabetes (producing new insulin-producing cells).

     * Myocardial infarction (heart attack).

     * Alzheimer's disease.

     * Parkinson's disease.

   * Used to produce blood cells required in diseases like anemia and thalassemia (blood disorders), or leukemia (blood cancer).

 Organ Transplantation:

   * Used to produce the required organ (like a kidney or liver) with the help of stem cells and then transplant it into a patient.

III. Organ and Body Donation

A] Organ Transplantation: 

 * Necessity: Many vital human organs can become inefficient or completely functionless due to various reasons like aging, accidents, infections, or disorders.

 * Consequence: Life of the person may become difficult, and in extreme cases, it can be fatal.

 * Solution: Under such conditions, if a person gets the necessary organ from a suitable donor, his/her life can be saved.

 * Process: The process of organ donation occurs with the consent of the donor or their relatives. A person can donate a single organ or, in some cases, multiple organs after death (depending on the organ).

 * Examples of Donatable Parts: Skin, certain parts of the body, blood.

 * Factors to Consider: Blood group, diseases, age, and overall health of the donor and recipient must be matched.

 * Organs Donated After Death: Organs like the heart, eyes, and kidneys can be donated after death only (called posthumous donation).

B] Organ and Body Donation: Definition and Significance

 * Definition: Human bodies are disposed of after death as per specified customs. However, due to progress in science, it has been realized that many organs can remain functional for a certain period even after death.

 * Concept: Traditional beliefs sometimes prevent organ donation. However, a liberal view is that such organs can be used to save the life of other needy persons, which is a commendable and charitable act.

 * Impact: Life of many people can be saved by organ donation (e.g., eyes/cornea can cure blindness, kidneys/liver/heart can save lives).

 * Body Donation: Whole bodies can be used for research in medical studies. Many government and social organizations are working to increase awareness about body donation.

Regards

Mansi