Skip to main content

Scientists Discover Way to Send Information into Black Holes Without Using Energy

3 comments

Scientists Discover How Immune Cells Physically Rip Bacteria Off Surfaces!

Our body is constantly fighting invisible enemies like bacteria. One of the most powerful defenders in this battle is a type of immune cell called macrophages. These cells act like tiny cleaners, searching for harmful microbes, grabbing them, and destroying them.

But what happens when bacteria are tightly stuck to surfaces, like tissues or medical implants? How do macrophages remove them?

A groundbreaking study by researchers at ETH Zurich, led by Jens Moller, reveals a fascinating answer: macrophages don’t just “eat” bacteria—they physically pull, lift, and scoop them off surfaces using a clever mechanical strategy.

Why This Discovery Matters

Bacteria often stick strongly to surfaces inside the body, such as:

  • Wounds

  • Medical implants

  • Urinary tract lining

This makes infections harder to treat. A well-known bacterium, Escherichia coli (E. coli), can cause serious infections when it enters the body. Understanding how immune cells remove such bacteria is critical for improving treatments and preventing infections.

The Challenge: Breaking Strong Bacterial Grip

When bacteria attach to a surface, they form multiple strong bonds. Pulling them off all at once requires a lot of force—more than macrophages can usually generate.

So instead of brute force, macrophages use a smart, step-by-step mechanical approach.

Step 1: Searching with Tiny Arms (Filopodia)

Macrophages first explore their surroundings using thin, finger-like extensions called filopodia.

These filopodia:

  • Extend and retract continuously

  • Scan the environment for bacteria

  • Can last from a few seconds to a couple of minutes

When a filopodium touches E. coli, it forms a very specific connection.

Step 2: Hooking the Bacteria

The connection between macrophage and bacteria is highly specialized:

  • The macrophage uses a receptor called CD48

  • The bacteria uses a sticky protein called FimH (found on hair-like structures called fimbriae)

This creates a strong molecular “hook” between the two.

What’s remarkable is that this bond becomes stronger when pulled—a rare phenomenon known as a “catch bond.”

Unlike normal bonds that break under force, this one gets more stable. This allows the macrophage to hold onto the bacteria for a long time—even up to 40 minutes.

Step 3: Building Strength Through Tension

As the macrophage pulls using filopodia:

  • The bacterial fimbriae stretch like tiny springs

  • This stretching helps maintain the strong bond

  • The connection remains stable despite movement

This step is crucial because it gives the macrophage enough time to prepare the next move.

Step 4: The “Shovel” Move (Lamellipodium)

Once the macrophage has a firm grip, it activates another structure called the lamellipodium.

This is a flat, sheet-like extension of the cell membrane that:

  • Grows toward the bacteria

  • Slides underneath it

Think of it like a shovel moving under a stuck object.

Step 5: Lifting the Bacteria Off the Surface

Instead of pulling the bacteria straight up (which would require too much force), the macrophage:

  • Pushes the lamellipodium underneath

  • Breaks the bonds one by one

This is called a “zipping mechanism”, where connections are broken gradually instead of all at once.

This clever strategy allows the macrophage to lift even tightly attached bacteria using relatively small forces.

Step 6: Engulfing and Destroying

Once the bacteria is lifted:

  • The macrophage forms a structure called a phagocytic cup

  • The bacteria is fully engulfed

  • It is then broken down inside the cell

This entire process is known as phagocytosis, a key defense mechanism of the immune system.

A Surprising Twist: Not All Bacteria Die Immediately

Interestingly, the study found that some E. coli bacteria can survive inside macrophages for a short time.

Instead of being destroyed instantly, they may:

  • Avoid immediate digestion

  • Interact with the cell’s internal pathways

  • Trigger immune responses

This delay might actually help the body by:

  • Improving antigen presentation

  • Strengthening the adaptive immune response

Implications for Medicine and Research

This discovery has important real-world applications:

1. Better Infection Treatments

Understanding how macrophages remove bacteria can help design:

  • Improved antibiotics

  • New therapies that boost immune function

2. Medical Implants

Bacteria often stick to implants like catheters or artificial joints.
This research could help:

  • Develop surfaces that are easier for immune cells to clean

  • Reduce implant-related infections

3. Drug Design Challenges

Some treatments use molecules like mannose inhibitors to block bacterial adhesion.

However, this study shows a potential downside:

  • These inhibitors may also block macrophages from recognizing bacteria

  • This could unintentionally protect bacteria from the immune system

The Bigger Picture: Mechanics Meets Biology

One of the most exciting aspects of this research is how it combines physics and biology.

It shows that immune defense is not just about:

  • Chemical signals

  • Biological reactions

But also about:

  • Physical forces

  • Mechanical strategies

Macrophages are not just “eating” bacteria—they are engineers, using force, structure, and timing to solve complex problems.

Conclusion

This study reveals a hidden and elegant process inside our bodies. Macrophages don’t rely on brute strength to remove bacteria. Instead, they:

  1. Search with filopodia

  2. Hook bacteria using strong molecular bonds

  3. Build tension

  4. Use a lamellipodium like a shovel

  5. Lift bacteria step by step

  6. Finally engulf and destroy them

This discovery not only deepens our understanding of the immune system but also opens new doors for medical innovation.

In the microscopic world, even the smallest battles are fought with incredible precision—and sometimes, the smartest strategy wins over sheer force.

Reference: Möller, J., Lühmann, T., Chabria, M. et al. Macrophages lift off surface-bound bacteria using a filopodium-lamellipodium hook-and-shovel mechanism. Sci Rep 3, 2884 (2013). https://doi.org/10.1038/srep02884

Comments

Post a Comment

Popular

Scientists Discover Way to Send Information into Black Holes Without Using Energy

For years, scientists believed that adding even one qubit (a unit of quantum information) to a black hole needed energy. This was based on the idea that a black hole’s entropy must increase with more information, which means it must gain energy. But a new study by Jonah Kudler-Flam and Geoff Penington changes that thinking. They found that quantum information can be teleported into a black hole without adding energy or increasing entropy . This works through a process called black hole decoherence , where “soft” radiation — very low-energy signals — carry information into the black hole. In their method, the qubit enters the black hole while a new pair of entangled particles (like Hawking radiation) is created. This keeps the total information balanced, so there's no violation of the laws of physics. The energy cost only shows up when information is erased from the outside — these are called zerobits . According to Landauer’s principle, erasing information always needs energy. But ...
3 comments
Read more

Black Holes That Never Dies

Black holes are powerful objects in space with gravity so strong that nothing can escape them. In the 1970s, Stephen Hawking showed that black holes can slowly lose energy by giving off tiny particles. This process is called Hawking radiation . Over time, the black hole gets smaller and hotter, and in the end, it disappears completely. But new research by Menezes and his team shows something different. Using a theory called Loop Quantum Gravity (LQG) , they studied black holes with quantum corrections. In their model, the black hole does not vanish completely. Instead, it stops shrinking when it reaches a very small size. This leftover is called a black hole remnant . They also studied something called grey-body factors , which affect how much energy escapes from a black hole. Their findings show that the black hole cools down and stops losing mass once it reaches a minimum mass . This new model removes the idea of a “singularity” at the center of the black hole and gives us a better ...
Post a Comment
Read more

How Planetary Movements Might Explain Sunspot Cycles and Solar Phenomena

Sunspots, dark patches on the Sun's surface, follow a cycle of increasing and decreasing activity every 11 years. For years, scientists have relied on the dynamo model to explain this cycle. According to this model, the Sun's magnetic field is generated by the movement of plasma and the Sun's rotation. However, this model does not fully explain why the sunspot cycle is sometimes unpredictable. Lauri Jetsu, a researcher, has proposed a new approach. Jetsu’s analysis, using a method called the Discrete Chi-square Method (DCM), suggests that planetary movements, especially those of Earth, Jupiter, and Mercury, play a key role in driving the sunspot cycle. His theory focuses on Flux Transfer Events (FTEs), where the magnetic fields of these planets interact with the Sun’s magnetic field. These interactions could create the sunspots and explain other solar phenomena like the Sun’s magnetic polarity reversing every 11 years. The Sun, our closest star, has been a subject of scient...
Post a Comment
Read more