Wednesday, September 8th 2010
The “Around the Web” series highlights informative websites, and also targeted blog posts and news articles, relevant to the courses I teach. This semester I teach Anth 143: Biology of Human Behavior, an introductory-level course that covers the basics of evolution, behavioral biology, and the interaction of biology and culture. My hope is that these posts are useful not only for my current students, but other people hoping to gain background or insight into these topics.
This week I wanted to share a few cool TED talks and other links to introduce you to our closest relatives and the methods of behavioral ecology. These should be useful for Anth 143 students at the University of Illinois, but also anyone hoping to learn more about biological anthropology.
Robert Sapolsky’s TED talk on the uniqueness of humans. Always engaging and fun, and will give you a perspective on primate field work, why humans are special, and why they are not.
Jane Goodall’s TED talk on a similar topic, what separates us from the apes. Also engaging, and it has a full interactive transcript.
Ed Yong at Not Exactly Rocket Science shows us that even non-primate species pass on cultural traditions. This also hints to us that humans, and even primates, aren’t necessarily unique-ier (to use Sapolsky’s term) than other animals.
Here is a podcast by author Vanessa Woods and blogger/anthropologist Greg Laden covering new book Bonobo Handshake and the falsehood of primitive cultures.
A cool PLoS paper that just came out on bonobo versus chimpanzee cognitive abilities. An important read since they’re our two closest relatives. Plus, one of the authors Brian Hare is featured in Ape Genius, which we watch later in the semester in Anth 143.
And remember, you can see all the relevant articles I retweet from my @KateClancy account by following the hashtag #anth143.
Tuesday, September 7th 2010
This is the third of four installments chronicling my visit to the Mogielica Human Ecology Study Site this summer. Here are parts one and two.
My last day at the field site was rather eventful. I really wanted to hike Mogielica, the path up the mountain starting only a fifty minute walk away. The always good-natured Laura came along.
Fifty minutes along the path I knew came and went. I realized we were on a road that had been built since I’d last been here. New houses popped into view, then a store. I had no idea how to get up the mountain now that my old reliable path was gone.
Thankfully, Laura had driven to the base of Lopien to hike it the weekend before, which was another thirty minutes walk. So we changed plans to hike that mountain instead.
We get to the parking lot and Laura finds the path to Lopien. Up to this point, the road, though narrow, had had open fields, yards and homes along it. Walking through this part of the Polish countryside is like walking through an idyllic storybook farming village. The homes and yards are cared for, the hay neatly raked, stacked or rolled, only the guard dogs that bark threateningly from their pen or leashes breaking the spell (and the few allowed to roam free, who try to chase us, making our hearts race in a most un-storybook-like way).
If the countryside seems to reflect every storybook’s happy village, the paths up the mountain are part of the enchanted forest. Dark, mature trees line the path thickly, and the air drops a few degrees cooler as soon as you step in. Far less light gets in, and the dirt is damp and quiet under your feet. There is very little to fear in Poland, except the increase in recent years in poisonous snakes, part of a failed experiment to reduce the rat population.
I hate snakes.
We don’t get very far at all before we encounter a tractor. Its wheels are jerked over so that it diagonally blocks our path. Since the path is cut into the dirt a bit, there is a six inch lip on either side of the path. We walk toward the tractor to try to find a way around. Maybe if we grab one side? Maybe we could pull up on a tree?
The buzz of a chainsaw freezes us into silence. Thirty to forty feet in front of us, just past the tractor, an enormous coniferous tree comes crashing to the ground, landing directly across the mountain path. As in, a few dozen feet in front of us. The breeze from its descent rustles our hair.
Laura and I laugh, because what else is there to do? Two minutes earlier to our hike and we would have been crushed. We decide we have had enough of a hike and head back.
I guess there are more things to fear in Poland than snakes.
Monday, September 6th 2010
I am reposting some of my LEE blog posts over here to highlight some of my research blogging. Hope you enjoy the ladybusiness anthropology!
If you are female and post-menarcheal (that is, you’ve had your first period), you have probably had at least one person tell you that you are PMSing – either jokingly, or with an unpleasant edge. You may have expressed anger or irritability; you may have simply stood up for yourself. Or, you may have no idea what prompted the statement.
Maybe you were angered further by this comment, because you have never experienced any shifts in mood in your premenstrual phase (the several days leading up to your period). Maybe you were embarrassed because, whether or not the comment was at the time accurate, you do feel different right before your period. There is a lot of variation in the emotional experience of the premenstrual phase, from no changes, to dysphoria (that’s mild depression) or anger and irritability, increased creativity, well-being and happiness, to a whole host of other feelings. Part of this variation is a small minority of women who do experience negative symptoms strong enough to interfere with their daily lives, often called premenstrual syndrome. A syndrome refers to the association of symptoms and/or signs that often occur together, but that does not mean the etiology, or origin, of this syndrome is the same for everybody, and that does not mean everyone has the same disease if they have the same set of symptoms. This distinction is important because there are several syndromes out there relevant to women’s health (polycystic ovary syndrome and chronic fatigue syndrome come to mind), yet it is a classification that says, to me, “hey, we don’t know what causes this and in fact it may be a whole bunch of different things going on for different people, but this is what we have so far.”
Despite the fact that the experience of the premenstrual phase is varied, and the negative symptoms some number of women experience are categorized by a syndrome which does nothing to explain its etiology, there appear to be only two games in town in treating PMS: hormonal contraceptives (HCs) and selective serotonin reuptake inhibitors (SSRIs). And the most studied potential origin of PMS is progesterone withdrawal.
Now, a twenty-eight day, ovulatory menstrual cycle looks like this:
Notice the estradiol (that’s a kind of estrogen) peak just before ovulation, and the swell of progesterone (pro-gest, so supporting gestation should you conceive) in the second half of the cycle. Progesterone is secreted by the corpus luteum, which is left behind by the follicle that erupts from your ovary when you ovulate. If that egg is not fertilized, to wend its way through the fallopian tube and invasively implant its way through your endometrium, then that corpus luteum and progesterone doesn’t have much of a purpose. Without a signal that pregnancy has occurred, the corpus luteum degrades, progesterone concentrations decline, and your nicely primed endometrium sloughs off to be able to make another plush surface for the next attempt.
Allow me to briefly wax anthropological before moving on in my discussion of these premenstrual symptoms. This twenty eight day cycle with its nice estradiol peak and progesterone swell and ovulation smack dab in the middle? It’s pretty much a farce.
Those are real luteal progesterone concentrations from healthy, normal, reproductively-aged women from past studies of mine in one population of women in rural Poland (the follicular phase is the first half of your cycle, luteal phase the second). And the next image is from a whole bunch of other studies showing population variation in progesterone. Regular menstrual cycles, and yet luteal phases that range from 9-17 days. Mid-luteal progesterone concentrations varying by several orders of magnitude. You are looking at data ONLY of healthy women, in a homogenous rural environment, and ONLY cycles where they ovulated. And yet, look at all that variation.
So hormone concentrations, menstrual cycle lengths, experiences of the menstrual cycle and menses themselves, vary so much so that the idea that there is such a thing as one normal cycle for everyone is patently false. Women’s reproductive functioning only makes sense in the context of its environment, and if it is responding logically (high stress, low function, and vice versa), it’s pretty safe to say that woman is normal.
Okay, so back to PMS and progesterone withdrawal. You may have noticed something in the preceding images: progesterone concentrations decline in the days leading up to menses in all ovulatory cycles. In a physiological process with so much variation it’s hard to determine universals, this is one of them. So I suppose it makes sense, then, that researchers think progesterone withdrawal has something to do with premenstrual symptoms. Further, post-partum depression or the maternity blues occurs soon after parturition, when a mother goes from having huge quantities of progesterone (orders of magnitude higher than in a regular menstrual cycle) to zero, once that placenta that was making all that yummy progesterone is birthed.
At the same time, if these symptoms are not universal, if in fact some women have positive experiences of their premenstrual phase (and post-partum period), and to top it off progesterone withdrawal is a major feature of the menstrual cycle for most women… then perhaps the idea that progesterone withdrawal is the trigger only serves to further pathologize a population that is historically overpathologized and understudied. That is, does it make sense to consider a universal feature of the menstrual cycle the culprit for a set of symptoms that affect about five percent of the population?
Let’s unpack the data a bit more, then, and cut these folks some slack… at least to start. There are two kinds of work going on in the literature: the first is the identification of the mechanism of how progesterone withdrawal could be producing effects in the brain, and what most folks are focusing on is the fact that progesterone concentrations are tied to allopregnanalone (ALLO) concentrations in the brain (this makes sense, since ALLO is a kind of progestin and progesterone is its precursor). The second is to identify whether it is how rapidly progesterone declines that produces negative symptoms (this certainly does vary, if you look at how different women’s mid-luteal progesterone concentrations are), the overall concentration, or the estradiol to progesterone ratio.
Several studies indicate an association between decreased ALLO concentrations and premenstrual syndrome and post-partum depression [1-6]. Gracia et al [3] also note lower ALLO concentrations in those individuals suffering from PMS who are responsive to SSRI treatment, versus unresponsive individuals. So it does seem like those with lower concentrations of ALLO (and thus lower progesterone at that time as well) are perhaps more likely to have PMS. However, it also looks like reduced ALLO isn’t the only explanation for PMS: 1) only 63% saw improvement with SSRI treatment, and 2) the women in this study (n = 46) were grouped into tertiles by their ALLO concentrations, and the highest tertile (the women with the highest ALLO concentrations) did not show improvement. So it seems it is possible to have PMS without low ALLO relative to your population.
The second issue, that it may not be total levels of progesterone/ALLO triggering PMS symptoms but rather something about the rapidity of decline (an understandable hypothesis to start from given what we know of post-partum depression) is not as frequently studied. But I did find one study that examined this and managed to review a few articles I hadn’t yet found: Beckley and Finn [1] described work that suggested more rapid decline in progesterone concentrations was associated with depression-like behaviors in rodents, and themselves found similar results both when creating progesterone withdrawal conditions with supplementation, and when using finasteride (which inhibits progesterone metabolism; also known as Propecia).
I think the idea here and the results are tantalizing, but I am not yet confident in the mechanism. Part of the reason for this is that in human studies women were only sampled once per cycle in the luteal phase; often something like five plus or minus three days before menses. If you look at the graph above (this is the same as the second figure, just the mean and standard deviation instead of the concentrations of each individual), that six day spread (-8 to -2) shows a significant amount of time-dependent variation in progesterone concentrations. Further, progesterone is strongly influenced by age, energy balance, energy expenditure, and population (developmental conditions) [7-14], and I am unclear whether this variation has an impact on these results or can be controlled for in future work. One last point to consider is that social influences on perceptions of menstruation, as well as degree of social support, urban versus rural setting, and level of education, predict premenstrual syndrome and post-partum depression quite strongly [15-18]. We need to be careful when examining something that is a product of the interaction between biology and culture not to simply look at the concentration of a hormone to explain its etiology.
References
1. Beckley EH, & Finn DA (2007). Inhibition of progesterone metabolism mimics the effect of progesterone withdrawal on forced swim test immobility. Pharmacology, biochemistry, and behavior, 87 (4), 412-9 PMID: 17597197
2. Brinton RD, Thompson RF, Foy MR, Baudry M, Wang J, Finch CE, Morgan TE, Pike CJ, Mack WJ, Stanczyk FZ, & Nilsen J (2008). Progesterone receptors: form and function in brain. Frontiers in neuroendocrinology, 29 (2), 313-39 PMID: 18374402
3. Gracia CR, Freeman EW, Sammel MD, Lin H, Sheng L, & Frye C (2009). Allopregnanolone levels before and after selective serotonin reuptake inhibitor treatment of premenstrual symptoms. Journal of clinical psychopharmacology, 29 (4), 403-5 PMID: 19593190
4. Maguire, J., & Mody, I. (2008). GABAAR Plasticity during Pregnancy: Relevance to Postpartum Depression Neuron, 59 (2), 207-213 DOI: 10.1016/j.neuron.2008.06.019
5. Monteleone, P. (2000). Allopregnanolone concentrations and premenstrual syndrome European Journal of Endocrinology, 142 (3), 269-273 DOI: 10.1530/eje.0.1420269
6. Nappi, R. (2001). Serum allopregnanolone in women with postpartum “blues” Obstetrics & Gynecology, 97 (1), 77-80 DOI: 10.1016/S0029-7844(00)01112-1
7. Chapman, J., McIntyre, M., Lipson, S., & Ellison, P. (2009). Weight change and ovarian steroid profiles in young women Fertility and Sterility, 91 (3), 858-861 DOI: 10.1016/j.fertnstert.2007.12.081
8. ELLISON, P. (1993). Population variation in ovarian function The Lancet, 342 (8868), 433-434 DOI: 10.1016/0140-6736(93)92845-K
9. Ellison PT, Panter-Brick C, Lipson SF, & O’Rourke MT (1993). The ecological context of human ovarian function. Human reproduction (Oxford, England), 8 (12), 2248-58 PMID: 8150934
10. Jasieńska G, & Ellison PT (1998). Physical work causes suppression of ovarian function in women. Proceedings. Biological sciences / The Royal Society, 265 (1408), 1847-51 PMID: 9802241
11. Lager, C., & Ellison, P. (1990). Effect of moderate weight loss on ovarian function assessed by salivary progesterone measurements American Journal of Human Biology, 2 (3), 303-312 DOI: 10.1002/ajhb.1310020312
12. O’Rourke, M.T., S.F. Lipson, and P.T. Ellison, Ovarian function in the latter half of the reproductive lifespan. American Journal of Human Biology, 1996. 8(6): p. 751-759.
13. Panter-Brick C, & Ellison PT (1994). Seasonality of workloads and ovarian function in Nepali women. Annals of the New York Academy of Sciences, 709, 234-5 PMID: 8154716
14. Rosetta L, Harrison GA, & Read GF (1998). Ovarian impairments of female recreational distance runners during a season of training. Annals of human biology, 25 (4), 345-57 PMID: 9667360
15. Cénac A, Maikibi DK, & Develoux M (1987). Premenstrual syndrome in Sahelian Africa. A comparative study of 400 literate and illiterate women in Niger. Transactions of the Royal Society of Tropical Medicine and Hygiene, 81 (4), 544-7 PMID: 3445335
16. Chaturvedi SK, & Chandra PS (1991). Sociocultural aspects of menstrual attitudes and premenstrual experiences in India. Social science & medicine (1982), 32 (3), 349-51 PMID: 2024146
17. Marván ML, Díaz-Erosa M, & Montesinos A (1998). Premenstrual symptoms in Mexican women with different educational levels. The Journal of psychology, 132 (5), 517-26 PMID: 9729845
18. O’hara, M., & Swain, A. (1996). Rates and risk of postpartum depression—a meta-analysis International Review of Psychiatry, 8 (1), 37-54 DOI: 10.3109/09540269609037816
