Boots for Achilles: progesterone's reduction of cholesterol is a second-order adaptation

Antagonism of GABA-A receptor inhibits the effects of progesterone on nociceptive behaviors and electrophysiological alterations in a rat model of neuropathic pain

Growing evidence highlights the neuroprotective potential of progesterone in mitigating various forms of nervous system injury. In previous research, we demonstrated that progesterone ameliorates both electrophysiological and behavioral deficits associated with chronic constriction injury (CCI) of the sciatic nerve in rats. However, the precise mechanisms underlying these effects remain poorly understood. This study aimed to elucidate the involvement of GABA-A receptors in mediating the therapeutic effects of progesterone on nociceptive behaviors, specifically thermal hyperalgesia and mechanical allodynia, as well as electrophysiological alterations in a rat model of CCI-induced neuropathic pain. Male rats received daily intraperitoneal injections of progesterone (6 mg/kg) starting on day 12 post-CCI and continuing through day 26. To evaluate the role of GABA-A receptors, the antagonist bicuculline (0.5 or 2 mg/kg, i.p.) was administered 30 min prior to progesterone in designated groups. Behavioral assessments were conducted on days 0, 12, 26, 28, and 35 post-CCI, followed by electrophysiological evaluations of the tibial and sural nerves. The results revealed that progesterone significantly attenuated both thermal hyperalgesia and mechanical allodynia and reversed CCI-induced electrophysiological impairments. Nevertheless, pretreatment with bicuculline blocked these beneficial effects at both behavioral and electrophysiological levels, suggesting that progesterone's neuroprotective and analgesic properties are, at least in part, mediated through GABA-A receptor signaling pathways.

Evaluation of the serum level of estrogen, progesterone, prolactin, and testosterone in patients with trigeminal neuralgia compared to a healthy population

OBJECTIVES

The goal of this study is to measure and compare the hormonal serum levels (estrogen, progesterone, testosterone, prolactin, dihydrotestosterone [DHT]) in trigeminal neuroglia (TN) menopausal women and healthy women.

MATERIALS AND METHODS

This cross-sectional and case-control study was performed in 2018 and 2019. For this study, menopausal women with confirmed TN were enrolled. Twenty-two healthy women in the control group and 19 in the case group participated. Blood samples were taken from participants for assessment of hormonal serum levels (estrogen, progesterone, testosterone, prolactin, DHT). Data were analyzed by SPSS version 18. Mann-Whitney, T-test, kormography test, nonmetric, χ2  test, and odds ratios have been used.

RESULTS

In patients with TN, the serum level of testosterone was significantly higher (p = .036), and the serum level of prolactin (p = .016) was significantly lower. Other evaluated hormones' serum level was identical in the two groups. Patients with abnormal estrogen levels were more in the TN group in comparison with the healthy group. The abnormality of progesterone in TN patients was more in comparison to the healthy control group.

CONCLUSIONS

Estrogen and progesterone serum levels in TN patients are higher in comparison with the healthy group, while prolactin and testosterone serum levels are lower in the control group. Moreover, the DHE serum level is similar in both groups.

Maternal plasma cholesterol and duration of pregnancy: A prospective cohort study in Ghana

Low plasma cholesterol may be associated with preterm birth; however, results are mixed and limited primarily to high-income countries. Our objective was to determine whether maternal plasma lipid concentrations are associated with pregnancy duration. We performed a nested cohort (n = 320) study of pregnant Ghanaian women enrolled in a randomized controlled trial. Total cholesterol, high-density lipoprotein cholesterol (HDL-C), low-density lipoprotein cholesterol, and triglyceride concentrations were analyzed in plasma at ≤20and 36 weeks gestation as continuous variables and also categorized into low, referent, or high (<10th, 10th-90th, >90th percentile). At ≤20 weeks, plasma lipid concentrations were not associated with pregnancy duration. At 36 weeks, total cholesterol and triglyceride concentrations were not associated with pregnancy duration. Higher HDL-C at 36 weeks was associated with a longer pregnancy duration (adjusted β-coefficient ± standard error: 0.05 ± 0.02 days mg^-1 /dL, p = .02); pregnancy duration was 5.9 ± 2.0 (mean ± standard error) days shorter among women with low HDL-C compared with the referent group (10th-90th percentile) (p = .02) and 8.6 ± 2.6 days shorter when compared with the high HDL-C group (p = .003). Pregnancy duration was 4.9 ± 2.1 days longer among women with low low-density lipoprotein cholesterol at 36 weeks gestation when compared with the referent group (p = .051). Our data suggest that low HDL-C in the third trimester of pregnancy is associated with a shorter duration of pregnancy in this study population but do not support the hypothesis that low total cholesterol is associated with a shorter pregnancy duration.

Motor Nerve Conduction Velocity In Postmenopausal Women with Peripheral Neuropathy

INTRODUCTION

The post-menopausal phase is characterized by a decline in the serum oestrogen and progesterone levels. This phase is also associated with higher incidence of peripheral neuropathy.

AIM

To explore the relationship between the peripheral motor nerve status and serum oestrogen and progesterone levels through assessment of Motor Nerve Conduction Velocity (MNCV) in post-menopausal women with peripheral neuropathy.

MATERIALS AND METHODS

This cross-sectional study was conducted at Jawaharlal Nehru Medical College during 2011-2013. The study included 30 post-menopausal women with peripheral neuropathy (age: 51.4±7.9) and 30 post-menopausal women without peripheral neuropathy (control) (age: 52.5±4.9). They were compared for MNCV in median, ulnar and common peroneal nerves and serum levels of oestrogen and progesterone estimated through enzyme immunoassays. To study the relationship between hormone levels and MNCV, a stepwise linear regression analysis was done.

RESULTS

The post-menopausal women with peripheral neuropathy had significantly lower MNCV and serum oestrogen and progesterone levels as compared to control subjects. Stepwise linear regression analysis showed oestrogen with main effect on MNCV.

CONCLUSION

The findings of the present study suggest that while the post-menopausal age group is at a greater risk of peripheral neuropathy, it is the decline in the serum estrogen levels which is critical in the development of peripheral neuropathy.

Bridging progestogens in pregnancy and pregnancy prevention

Steroid hormones have been in use for more than a half a century as contraceptive agents, and only now are researchers elucidating the biochemical mechanisms of action and non-target effects. Progesterone and synthetic progestins, critical for women's health in the US and internationally, appear to have important effects on immune functioning and other diverse systems. Apart from the contraceptive world is a separate field that is devoted to understanding progesterone in other contexts. Based on research following a development timeline parallel to hormonal contraception, progesterone and 17-hydroxyprogesterone caproate are now administered to prevent preterm birth in high-risk pregnant women. Preterm birth researchers are similarly working to determine the precise biochemical actions and immunological effects of progesterone. Progesterone research in both areas could benefit from increased collaboration and bringing these two bodies of literature together. Progesterone, through actions on various hormone receptors, has lifelong importance in different organ systems and researchers have much to learn about this molecule from the combination of existing literatures, and from future studies that build on this combined knowledge base.