Like good health and youth, most of us take a thick head of hair for granted -- that is, until it is gone. For many people, hair transplant procedures can help bring back the appearance of a full -- or, at least, fuller -- head of hair.
Like the cure for cancer, those new treatments aren't nearly
ready for prime time. But they're coming, promises George Cotsarelis, MD,
director of the Hair and Scalp Clinic at the University of Pennsylvania,
"In the last 5 to 7 years there has been a boom in the
understanding of hair loss," Cotsarelis tells WebMD. "We've made great
strides at the level of basic research. Now the question is how we can convert
these findings into clinical benefits. Those kinds of leaps really take
The great leap would be to grow new hair on bald heads. But
smaller steps aren't that far away.
Why do we care about a cure for baldness? Look around you. Hair
loss is extremely common, it usually happens when the normal process of hair
growth gets disrupted.
What We Know About Hair
"The hair is real. It's the head that's a
Until it's gone, hair is easy to take for granted. But a close
look reveals the hair follicle to be one of the most interesting organs of the
body. It's most unusual feature: It is self-regenerating.
Hair follicles live just below the top layer of the skin. You
have them all over your body except, fortunately, on your lips, palms, and
At the base of the follicle is the hair bulb, where wildly
growing matrix cells become hair.
A little farther up the follicle is the mysterious feature
called the bulge. That's where follicle stem cells live. When they get the
right set of chemical signals, these self-renewing cells divide. They don't
divide like normal cells, in which both halves become new cells that keep
splitting and developing. Only one half of the follicle stem cell does that.
The other half becomes a new stem cell, and stays put for future