We Are Electric, Inside The 200-year Hunt For Our Bodies Bioelectric Code
Sally Adee, 2023
The twentieth century could be said to be the genetics era where, starting in the 1950’s, with the deciphering of the genetic code, discoveries, advancements in decoding the genome have escalated at an exponential rate. It now appears the twenty first century may be the era of bioelectric code. It has been known since the 18th century with the discoveries of Italian scientists Galvani and Volta that muscle action was controlled by electric signals through the nervous system. How that system worked had been somewhat of a mystery until relatively recently. As scientists have probed biological multicellular systems, it has become apparent that aside from the nervous system, there is a cellular and intercellular bioelectric coding system which controls development and sustaining actions fundamental to all life forms. This is the subject of Sally Adee’s book which explores cutting edge discoveries and delves into the questions of how these discoveries will impact medicine and society going forward. When an embryo develops into a recognizable organism, how do cells know what organ to form and what position it will occupy and when to stop growing? When there is an injury to a particular organ, how does the immune system know where to respond and when to stop responding? Why do cancer cells flaunt the boundaries of cellular growth and expand out of control? We now have answers to these questions, and they come from the field of bioelectricity.
Until the early twentieth century it was assumed that signals along the nervous system were controlled by the flow of electrons like electricity in a wire. That assumption was shattered in the 1920’s at Cambridge University when it was discovered that the signals were caused by the transfer and exchange of differently charged potassium and sodium ions across the synapse of the nerve. Until the 1980’s it was assumed that the role of charged ion signaling was confined to the nerve cells. Not anymore. Skin is made up of three layers of tissue with the outside called the epidermis. At Aberdeen University it was discovered that there is an electrical differential between the inner and outer layers of skin with the outer surface electrically negative with respect to the inner layers and forms a sort of battery. When you cut or wound the skin you create something akin to a short circuit with a leaking current. “All that leaking current creates a field whose influence can be felt across some distance within the body. This acts like a combination burglar alarm, compass and bat signal for surrounding cells…..the naturally occurring field created by the wound current convinces a whole crew of them to migrate to the wound. It guides in and directs the body’s emergency workers: the keratinocytes and fibroblasts that rebuild the structure, and clean-up crew (the macrophages). They all work together to reseal the epidermis. What’s even cooler? The electric field directs the cells to the center of the wound. That’s your natural cathode – the big red bulls-eye toward which all the migrating cells in the body are marshalled.”
It turns out that this property is not unique to your skin cells. As the skin ‘s membrane encloses the entire body, an organ’s membrane encloses, acts as a protective boundary, and turns out to have the same electrical battery properies as the skin. “Every organ in your body has a voltage, and it uses that voltage. The reason for the heart battery is easy to conceptualize – the heart literally uses the voltage to control its beat. It’s an electrical contraction, but you also have a kidney battery, a prostate battery. Everywhere current crosses epithelium, membrane, you get a battery. The eye battery is probably harder to conceive of, but it’s the coolest one. The eye has an extra strong wound current that helps speed up the healing process in the cornea and lens when they are injured. That’s because the retinal epithelium is one of the most electrically active tissues in your body: the reason any of us can see anything at all is because of the electrical currents and fields that eddy about its many layers….. bone is electric too. Bone is a piezoelectrical material, which means it’s a tissue that can take one form of energy and convert it to another. For example, the stress of your footfalls on your bones makes them grow stronger because the charges bone cells generate in response to this mechanical activity gets translated into electric signals that enhance bone growth. Bone also emits strong wound currents when it breaks: voltages appear at fracture sites and help the bone heal its wound. In short, you can’t talk about a living system without recognizing its electrical component.”
How do these new findings of the bioelectric code change our perceptions of embryonic development? In the age of genetics, we have all embraced the idea that the blueprint to build a human being or any animal was encoded in its genome. Actually, the genome encodes the proteins to build the organs of a human or animal but it doesn’t specify how to organize these organs into us, how many eyes, how many arms and legs, how big, in the right place and right order. If DNA does not do this, then what does? Michael Levin at Harvard discovered in 2011 that each cell type in the body has a characteristic unique electrical charge. Using electrosensitive dyes to identify voltage differences, he was able to discern where anatomical features would develop before they were manifest. Electrical signals encoded the locations of anatomical features. By inserting errant voltages into frog embryos, he was able to completely scramble the coding system resulting in disfunctions such as eyes appearing on legs. “Levin started to think of the information taking the form of a code…. A cellular intranet quite unrelated to the nervous system, connecting cell to cell. Each new cell that cleaves off is already connected to the cells around it. Long before nerve cells develop synapses, our non-excitable embryonic cells have another much faster, more electrical way of connecting…. The bioelectric code is the reason you retain that same shape throughout your entire life; it prunes your dividing cells so you keep being recognizably you.”
How does the bioelectric code impact our understanding of Cancer? Stem cells before they become differentiated into distinct types of organ cells have a unique electrical signature. They have zero electrical differential charge. So do cancer cells. In other words, they leave behind their prior identities as skin or bone cells or liver cells and revert to a cell with a special type of ion channel found in the cells supercharged multiplication phase in fetuses. Is this fundamental feature of Cancer leading to some promising insights? In 1999, Anna Soto and Carlos Sonnenschein of Tufts University suggested: “If bioelectric signaling was an important part of how cells communicate to work on pattern and coherence, they reasoned, and cancer represented a break in this multicellular contract, then interfering with cell’s ability to send bioelectric signals should lead to cancer… it was evidence that bioelectricity is the informational glue that holds big multicellular cellular structures together.” Cancer seems to be in essence a malfunction of the bioelectric coding and signaling system and there lie some potential avenues for promising therapies that are now being explored.
In my lifetime our understanding of biology, physics, astronomy, to name a few, has been exponential and unparalleled in human history. Maybe history looking back at the past century will focus on this renaissance in human understanding as comparable to that of the artistic and humanistic renaissance of the 15th and 16th centuries. This knowledge that now comes forward changes our very perceptions of who we are as biological creatures intimately connected to all life on our planet. This is a very exciting time to be alive and “We Are Electric” emphasizes how miraculous our existence and all life is on this our small rocky outpost in the universe. I confess to being a nonapologetic science nerd and maybe to get through the book’s 300 pages to the end you may have to be a tinge nerdish. JACK