The Sodium-Potassium Pump: Running the Engine Backwards

[2nd Edition Note: I have no idea how I left this out.  I’m not sure exactly when I figured this part out but it was something I referred to even in my early writings] Here’s something else from the Article that I somehow managed to leave out of this book. And it’s a big one. The sodium-potassium pump can run backwards. And when it does, it actually generates ATP.

[Thirty years trying to reconstruct a condition that revolves around ATP, salt, and water, and I somehow left out a mechanism that involves all three. Nice work, Architect.]

First, a little biochemistry.

Every living cell in your body has sodium-potassium pumps embedded in its membrane. They are tiny molecular machines that normally consume ATP to move three sodium ions out of the cell and two potassium ions into it. This maintains the electrochemical gradients that cells depend upon for electrical activity, nutrient transport, fluid balance, and survival.

It’s an expensive operation. Maintaining these gradients consumes a substantial portion of the ATP your body produces.

But here’s something fascinating. The pump is reversible.

Under the right conditions, instead of consuming ATP to move sodium out and potassium in, it can run in reverse, moving three sodium ions into the cell and two potassium ions out, while synthesizing ATP from ADP and inorganic phosphate.

Yes, it can actually produce ATP instead of consuming it.

But here’s the really interesting part. While generating ATP, it’s moving sodium INTO the cell and potassium OUT of it.

Potassium. That same ion my body has had so much difficulty getting rid of.

[See where this is going?]

The cell is effectively running an emergency generator, converting its stored electrochemical gradient into ATP while expelling potassium into the surrounding fluid. And if the kidneys aren’t adequately removing that potassium, it hasn’t left the body. It’s accumulating outside the cells.

Now we’ve got a problem. Excess extracellular potassium interferes with the electrical activity of the heart. Meanwhile, the rising potassium concentration outside the cells reduces the very gradient that allows the pump to run backwards.

So the system is spending its stored electrochemical energy, making some ATP in the process, and potentially creating an increasingly dangerous potassium imbalance as the reserve runs down.

[Quite an elegant little arrangement, until the bill comes due in 2008]

This is how I reconstruct the mechanism I remember from the Article. The reverse pump itself is established biochemistry. Whether this entire sequence was operating in my tissues remains to be demonstrated.

This isn’t science fiction. Garrahan and Glynn demonstrated the reversibility of the sodium-potassium pump in 1966. Subsequent experiments confirmed that the enzyme can operate in reverse when the electrochemical gradients and available substrates favor that direction.

[Think of a hydroelectric dam. You spend energy pumping water uphill to store it. Later, you let the water flow downhill through the turbines and recover energy. Same basic principle. Except your body has trillions of these little machines.]

And this brings us back to the Article.

I remember the sodium-potassium pump reversal being part of the condition. I don’t remember every detail of the original explanation, but the essential mechanism was that the ionic conditions inside and around the host cells were altered as Candida became increasingly involved in tissue metabolism.

At the time, much of the molecular machinery that might explain how the organism could accomplish this had not yet been characterized.

Today, we know that Candida albicans possesses multiple potassium transport systems, can modify the pH of its surroundings, and can disrupt host cellular membranes through candidalysin. These processes can influence the electrochemical environment in which the host’s sodium-potassium pumps operate.

Candida is moving existing ions, consuming metabolic substrates, and altering the environment in which the cell must function.

Now consider what happens when that environment changes sufficiently to reverse the pump.

Instead of spending ATP to maintain the gradients, the cell begins harvesting energy from them. Sodium moves inward, potassium moves outward, and the energy stored in those gradients is converted into ATP.

The cell has found another source of energy.

But there’s a catch.

Those gradients are a stored reserve. The cell spent energy establishing them in the first place. Running the pump backwards is effectively drawing down that reserve. Unless something restores the gradients, they eventually dissipate, and the pump can no longer produce ATP through that mechanism.

So it isn’t necessarily a less efficient pump. It’s an energy system with a limited fuel supply, the electrochemical gradient itself.

[You can run a hydroelectric turbine on the water stored behind the dam. But eventually, unless somebody puts more water back, you’re out of business.]

Under the Redacted Science framework, this offers an intriguing explanation for how an organism-host system might extract additional energy during a phase when conventional ATP production is compromised. The host is using an energy reserve already present inside its own cells.

And what happens as that reserve is exhausted?

The normal ionic balance begins to fail. Intracellular potassium can fall, sodium concentrations can change, membrane potentials deteriorate, and the cell loses the ability to maintain its volume and normal transport functions.

One possible endpoint is apoptosis, programmed cell death.

An early characteristic of apoptosis is something called apoptotic volume decrease. Potassium and chloride leave the cell, water follows, and the cell shrinks. Intracellular sodium concentration may rise even while the cell is losing water and total solute.

Think about that. A cell can become smaller while the concentration of sodium inside it increases. It’s the net movement of ions and water that determines the final volume.

This connects to something else I remember from the Article: the progressive shrinkage of cells, changes in their salt concentrations, and the unusual properties of the resulting tissues.

The precise connection between pump reversal and apoptosis remains an open mechanistic question. Experimentally reversing the sodium-potassium pump is one thing. Demonstrating that Candida induces and sustains the process inside living mammalian tissue is another. We have evidence for the individual mechanisms, but not yet for the complete sequence.

Still, the implications are considerable.

A cell that normally consumes ATP to preserve its electrochemical gradients could, under exceptional conditions, reverse that machinery and generate ATP by consuming the gradients instead. If the process progresses to failure of ionic homeostasis, the same cell may lose potassium, redistribute sodium, shed water, and eventually undergo apoptosis.

And if this is happening across a population of cells over an extended period, the consequences could extend to entire tissues: altered electrical signaling, changes in volume, loss of normal cellular function, and potentially the accumulation of damaged or dying cellular structures.

Could that contribute to the unusual skin thickening, tissue changes, and progressive cellular shrinkage the Article described?

That’s the question. [Yes! But Chat is hedging these days]

I remember the Article discussing sodium-potassium pump reversal as part of the condition. What I cannot reconstruct from memory is the precise sequence of ionic changes or how the authors connected pump reversal to the later tissue changes. My reconstruction here combines that recollection with the biochemistry established since.

And the really interesting thing is that we now know much more about the molecular machinery than we did in 1995, much less when the original researchers would have been investigating this condition.

The pump’s reversibility is real. The ionic manipulation capabilities of Candida are real. The apoptotic changes in sodium, potassium, and cellular volume are real.

Whether they form the coordinated sequence I remember from the Article is a hypothesis we can actually test.

[Imagine that. We can test it. We’ve had the sodium-potassium pump reversal literature since 1966, and the organism’s molecular toolkit has been steadily coming into focus ever since. Sometimes the pieces of a puzzle sit on different shelves for sixty years because nobody thinks to put them together.]

One last thing: The normal sodium-potassium pump consumes energy to keep the cell alive. Under the right conditions, that same machinery can generate energy by spending the very gradients it was built to maintain.

The cell can keep making ATP by consuming its own electrochemical reserves.

That’s one hell of an emergency generator.

And I will take it one step further, the Article discussed how the cells all have this done to them.  At that point, eventually, decades later, you’d thing – well, that’s the end, no more energy, right?  Wrong.  There is one last layer – but to get there you need sugars/ketones/alcohol to get to that wrapped up candida.  Then it use the last energy source available – the cell walls.

Remember how the Article described the Candida being wrapped up in apoptotic cellular material? And how, in the final stages, the men were careful about their posture because fluid carrying sugar, ketones, or alcohol could reach the enclosed organism?

That was important.

The organism needed access to fuel. Enough to activate its metabolism and continue the process. And once it was metabolically active, another substrate was waiting right there.

The material surrounding it.

Human cells don’t have cell walls. They have lipid membranes, built primarily from phospholipids and proteins. And Candida possesses enzymes capable of breaking those materials apart.

Phospholipases attack membrane phospholipids, releasing fatty acids. Lipases break down other lipids. Secreted aspartyl proteases attack proteins, making their constituent amino acids available.

The fatty acids can enter fungal β-oxidation pathways, producing acetyl-CoA. From there, the organism can extract energy through its remaining metabolic machinery.

[Yes, the container can become the fuel. There’s a certain awful elegance to that.]

And this brings us to what I remember from the final stages described in the Article.

The progressive consumption of apoptotic tissue. The loss of muscle. The cellular membranes themselves becoming the final available substrate.

The photograph of the man with the withered arm.

The warning that exercise could direct the process toward tissues already running out of resources.

The men who had to remain almost completely motionless to conserve whatever structural integrity they had left.

I had remembered those things individually. But they belong together.

The last energy reserve isn’t another pump, or another circulating fuel. It’s the physical structure of the host’s remaining tissue.

That is how I reconstruct the final layer of the mechanism described in the Article. We know Candida can degrade host membranes and metabolize some of their components. Whether it does so as a coordinated, body-wide terminal energy program, following decades of ionic-gradient exhaustion, remains to be established.

But it explains why I have spent so much time thinking about the final stages of this condition.

The fuel economy changes until eventually the machinery is consuming the structure that supports it. [We all need something to look forward to…]

https://jimcraddock.com/redacted-science-compilation.html
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