So, what are your feelings on cheese and sewers?
There are many things which I have not anticipated doing in my life. Among them:
1) Bungee jumping off a cliff
2) Climbing Mount Everest
3) Selling a painting I have done for thousands of dollars (if you have seen me draw - art scholarship from grade 2 notwithstanding - you would understand)
4) Fronting a rap group
5) Giving a rat a neurological examination
Well, after this week, find some elastic cord, gather up the rock picks, break out the oil paints and help me get down with my bad self in repetitive, poorly constructed rhyme because number 5 has been crossed off the list! How does one do a neurological exam on a rat (in our case, 12 rats)? Well, seeing as the title of this post is perhaps not that helpful in terms of anything resembling real life, let me describe it for you:
1) You pick up the rat by its tail and wrap the front part of its body in a towel (not always that easy a task, they are a pretty psyched up about life at this point).
2) If you have anaesthetized one of the rat's two feet (as we did), you put the rat's foot on a hotplate until he (they are all "he"s) lifts it up, or not longer than 12 seconds so as not to burn the little guy's foot (the hotplate isn't that hot - you could keep your hand on it comfortably for about three seconds, which is considered a "normal" neurological response). Repeat the experiment on the other foot, which is not anaesthetized. This is considered to represent the nerve response time.
3) Next, you put the little guy on a scale and see how much weight he can bear on each of his feet - this is the motor response evaluation
4) Then, with Mr. Rat sitting comfortably on the counter, you pull each hind leg backwards and see how it responds - if it snaps back underneath the rat as before, that is "normal"; if it stays hanging backwards, that is considered "blocked"
5) Finally, with a pair of tweezers, you give Mr. Rat a small pinch on the bottom of both feet and see if he recoils the foot
Actually, if you a lab rat, this is a pretty sweet experiment to be assigned to - very minimal pain (the whole point of the experiment is that you are hoping to block the nerve response, such that the rat would feel nothing) and very limited post-experiment effects (actually, all the rats would be considered to be perfectly normal even after the experiment). Plus, the living conditions in the animal facility are quite nice - plenty of food and water and large cages to move around in (the space issue in particular is very tightly controlled - animal husbandry experts check all the animals each day and will separate animals which they deem to be too crowded into their cages). However, based on their repeated waste excrement (both solid and liquid) during the experiment, I am not sure the rats truly appreciated how lucky the were (or at least they didn't show their gratitude to us). In particular, rat #11 was a real troublemaker -- I am convinced his weight dropped roughly in half over the course of our appoximately 2 minute experiment sequence on him given his nothing-short-of-prodigious production in the waste generation department. My personal favourite was rat #6, who was really on the ball with his responses (fastest control paw lift off the hot plate of all the rats! Good job #6!). They are actually kind of cute in person, particularly if you can't see their tail at any point (as the picture would indicate - although it must be noted that this isn't a picture of one of my rats, only other rats of the same breed, since there are no cameras allowed in the facility due to PETA concerns).

At any rate, the experiment went very well, with my formulation almost tripling the length of time over which the nerve impulses remained blocked when compared to the drug solution injected alone. Also, when the rats were sacrificed later in the week for dissection (not nearly as unpleasant a process as I was expecting), there was no significant tissue response whatsoever and the polymers I had used had basically been resorbed into the body, where they would degrade in a couple of weeks into components which the rats could add to their prodigious excrement production. So, with a couple of cell culture experiments this week, some more materials analysis to be done in the next couple weeks, and another 12 rat set to examine in order to test one more formulation and perform a couple more controls, I will have my first MIT paper, which is kind of exciting. The other neat part is that all the materials I used are non-modified versions of materials already approved by the FDA (the U.S. Food and Drug Adminstration) and is easier to apply to the desired site than the competing materials. So, it is not outside the realm of imagination to see this being used on real human patients in the not-so-distant future (assuming a company is interested in actually taking the idea to market). So, good times in the lab indeed!










