Hepatocytes, Exosomes, and Cell Stress Vocabulary

What are hepatocytes?

the main functional cells of the liver. They perform important jobs such as processing nutrients, removing toxins, and helping the liver function.

What are exosomes?

tiny membrane-bound particles released by cells. They carry proteins and signaling molecules that help cells communicate.

Why do cells release exosomes?

to communicate with other cells by sending proteins and other signaling molecules.

What is cellular stress?

occurs when conditions challenge, damage, or disrupt the normal function of a cell.

What were the three stress conditions in my experiment?

H₂O₂ caused oxidative stress, LPS caused inflammatory stress, and hypoxia caused low-oxygen stress.

What is the control group?

hepatocytes maintained in liver media only, with no additional stress treatment. It provides a normal baseline for comparison.

What is liver media?

provides the nutrients and conditions hepatocytes need to survive and grow in culture.

What is H₂O₂?

hydrogen peroxide. It was used to create oxidative stress in the hepatocytes.

What is oxidative stress?

occurs when reactive oxygen molecules become unbalanced and may damage parts of a cell.

What is LPS?

lipopolysaccharide. It was used to stimulate an inflammatory response in the hepatocytes.

What is inflammation?

part of the body's response to injury, infection, or harmful conditions. In this experiment, LPS was used to model inflammatory stress.

What is hypoxia?

a condition in which cells experience low oxygen.

Why were hepatocytes placed in a hypoxia chamber?

to expose them to low-oxygen stress and study how this affected exosome marker expression.

What is hepatocyte isolation?

the process of separating hepatocytes from mouse liver tissue so they can be cultured and studied.

Why were the liver cells filtered?

to remove larger pieces of tissue and debris.

What is centrifugation?

the process of spinning samples at high speed to separate cells or materials.

Why were the centrifuge tubes balanced?

so the centrifuge could spin evenly and safely.

What is a cell pellet?

the concentrated group of cells that collects at the bottom of a tube after centrifugation.

What is the supernatant?

the liquid layer above the cell pellet after centrifugation.

What does resuspend mean?

to mix the cell pellet back into liquid media so the cells are spread throughout the liquid again.

Why were the hepatocytes counted?

\so approximately the same number of hepatocytes could be placed in each dish, making the experiment fair and consistent.

What is conditioned media?

culture media collected after cells have grown in it and released substances, including exosomes, into it.

Why was conditioned media collected?

because it contained the exosomes released by the hepatocytes.

What are CD63, CD81, and CD9?

proteins commonly used as exosome-associated markers.

Why did we measure CD63, CD81, and CD9?

to determine whether different stress conditions affected exosome marker expression.

What is NanoSight?

an instrument that tracks tiny particles in a sample and measures their size and concentration.

What did NanoSight tell us?

showed the size distribution of particles in the sample and supported the presence of particles consistent with exosomes.

Does NanoSight alone prove every particle is an exosome?

No. it measures particle size and concentration.

What is a western blot?

a laboratory technique used to detect specific proteins in a sample.

What did the western blot measure in my experiment?

the exosome-associated proteins CD63, CD81, and CD9.

What do stronger or darker western blot bands generally indicate?

indicate a stronger protein signal or higher detected protein expression.

What was the order of exosome marker expression in my results?

From weakest to strongest: Control → LPS → H₂O₂ → Hypoxia.

Which treatment showed the strongest exosome marker expression?

Hypoxia, or low oxygen, showed the strongest exosome marker expression.

What was the main finding of my research?

Cellular stress was associated with increased exosome marker expression in hepatocytes, and hypoxia produced the strongest signal.

Did the western blot directly count the number of exosomes?

No. The western blot measured exosome-associated protein markers, not the exact number of exosomes.

Why does this research matter?

Understanding how stressed liver cells communicate through exosomes may help researchers learn more about liver injury, inflammation, liver disease, and cancer.

What is a biomarker?

a measurable biological sign that can provide information about a normal or diseased condition.

What is my entire project in one sentence?

I studied how oxidative stress, inflammation, and low oxygen affect exosome marker expression in mouse hepatocytes.