To demonstrate the myo-inositol depletion hypothesis in hyperglycemia-induced embryopathy, rat conceptuses of 9.5 days of gestation in the early head-fold stage were grown in vitro during neural tube formation for 48 h with increasing amounts of glucose. Supplementation of the myo-inositol completely restored the myo-inositol content of the embryos and resulted in a significant decrease in the frequency of neural lesions (7.1% vs 23.9%) and a significant increase in crown-rump length and somite numbers. Much less significantly, sorbitol accumulation was also observed in the extra-embryonic membrane in response to hyperglycemia, neither hyperglycemia nor the myo-inositol supplementation modified the myo-inositol contents of the extra-embryonic membrane.
Myo-inositol combined with folic acid (Inofolic) 4 g a day was administered continuously for 6 months. RESULTS: Twenty-two out of the 25 (88%) patients restored at least one spontaneous menstrual cycle during treatment, of whom 18 (72%) maintained normal ovulatory activity during the follow-up period. A total of 10 singleton pregnancies (40% of patients) were obtained. Nine clinical pregnancies were assessed with fetal heart beat at ultrasound scan. Two pregnancies evolved in miscarriage. CONCLUSION: Myo-inositol is a simple and safe treatment that is capable of restoring spontaneous ovarian activity and consequently fertility in most patients with PCOS.
Recently, a number of studies have shown that the presence of several compounds in the follicular fluid positively correlates with oocyte quality and maturation (i.e., myo-inositol and melatonin). In the present study, we aim to evaluate the pregnancy outcomes after the administration of myo-inositol combined with melatonin in women who failed to conceive in previous in vitro fertilization (IVF) cycles due to poor oocyte quality. Materials and methods. Forty-six women were treated with 4 g/day myo-inositol and 3 mg/day melatonin (inofolic® and inofolic® Plus) for 3 months and then underwent a new IVF cycle. Results. After treatment, the number of mature oocytes, the fertilization rate, the number of both, total and top-quality embryos transferred were statistically higher compared to the previous IVF cycle, while there was no difference in the number of retrieved oocyte. After treatment, a total of 13 pregnancies occurred, 9 of them were confirmed echographically; four evolved in miscarriage. Conclusion. The treatment with myo-inositol and melatonin improves ovarian stimulation protocols and pregnancy outcomes in infertile women with poor oocyte quality.
In an attempt to evaluate the role of inositol supplementation in insulin-resistant patients with polycystic ovary syndrome (PCOS), undergoing gonadotropin ovulation induction using the low-dose step-down regimen, we conducted a prospective longitudinal study comparing the stimulation characteristics of 15 patients treated with inositol, to a cohort, matched by age and body mass index (BMI), without inositol. Inositol nutritional supplementation produced very good clinical results with a significant reduction in cancellation rate (0 vs. 40%) and the consequent improvement in clinical pregnancy rate (33.3% vs. 13.3%).
Although D-chiro- and myo-inositol both reduced the frequency of spina bifida in curly tail mice by all routes of administration, D-chiro-inositol consistently exhibited the more potent effect, reducing spina bifida by 73–86% in utero compared with a 53–56% reduction with myo-inositol. Pathological analysis revealed no association of either myo- or D-chiro-inositol with reduced litter size or fetal malformation. CONCLUSIONS: D-chiro-inositol offers a safe and effective method for preventing folic acid-resistant neural tube defects in the curly tail mouse. This raises the possibility of using inositol as an adjunct therapy to folic acid for prevention of neural tube defects in humans.
obese women with PCOS given 1200 mg/day of d-chiro-inositol for 6 to 8 weeks, the mean area under the plasma insulin curve after the oral administration of glucose decreased from 13,417 to 5158 µU/ml/min; glucose tolerance did not change significantly. The serum free testosterone concentration in these 22 women decreased from 1.1 to 0.5 ng/dL. The women's diastolic and systolic blood pressure decreased by 4 mm Hg, and their plasma triglyceride concentrations decreased from 184 to 110 mg per deciliter (2.1 to 1.2 mmol per liter). None of these variables changed appreciably in the placebo group. Nineteen of the 22 women who received d-chiro-inositol ovulated, as compared with 6 of the 22 women in the placebo group. Conclusions: d-Chiro-inositol increases the action of insulin in patients with PCOS, thereby improving ovulatory function and decreasing serum testosterone concentrations, blood pressure, and plasma triglyceride concentrations.
insulin curve after oral administration of glucose decreased significantly from 8,343 mU/mL/min to 5,335 mU/mL/min. Concomitantly, the serum free testosterone concentration decreased significantly from 0.83 ng/dL to 0.22 ng/dL. Six of the 10 women (60%) in the D-chiro- inositol group ovulated in comparison with 2 of the 10 women (20%) in the placebo group. Systolic and diastolic blood pressures, as well as plasma triglyceride concentrations, decreased significantly in the D-chiro- inositol group . We conclude that, in lean women with PCOS, D-chiro-inositol reduces circulating insulin, decreases serum testosterone, and ameliorates some of the metabolic abnormalities (increased blood pressure and hypertriglyceridemia) of syndrome X.
Urinary clearance of D-chiro-inositol is inversely correlated with insulin sensitivity in women and is a strong independent predictor of insulin resistance in multivariate models. The urinary clearance of D-chiro-inositol was increased almost sixfold in PCOS compared with normal women, but not myo-inositol clearance. PCOS, which is characterized by insulin resistance, is associated with a selective increase in urinary clearance of D-chiro-inositol and impaired D-chiro-inositol containing-IPG release in response to insulin. These findings are consistent with a defect in tissue availability or utilization of D-chiro-inositol in PCOS that may contribute to the insulin resistance of the syndrome.
insulin curve after oral administration of glucose decreased from 8.54 to 5.535 μU/ml/min. The serum total testosterone decreased from 99.5 to 34.8 ng/dl, and serum free testosterone from 0.85 to 0.24 ng/dl. SHBG increased from 144 to 198. The progesterone peak value was higher in the Myo-inositol group (15.1 ng/ml). Plasma triglycerides decreased from 195 to 95 mg/dl. Systolic blood pressure decreased from 131 to 127 mmHg. Diastolic blood pressure decreased from 88 to 82 mmHg. The index of composite whole body insulin sensitivity increased from 2.80 to 5.05 mg-2/dl-2 . Also, 16 out of 23 women of Myo-inositol group ovulated (4 out of 19 in placebo group).
LH, testosterone, free testosterone, insulin and HOMA index resulted significantly reduced; no significant changes were observed in plasma FSH and androstenedione levels.
folic acid as placebo, and 45 received myo-inositol plus folic acid (4 g myo-inositol plus 400 mcg folic acid). The ovulation frequency assessed by the ratio of luteal phase weeks to observation weeks was significantly higher in the treated group (25%) compared with the placebo (15%), and the time to first ovulation was significantly shorter [24.5 d compared with 40.5 d]. The number of patients failing to ovulate during the placebo-treatment period was higher in the placebo group, and the majority of ovulations were characterized by normal progesterone concentrations in both groups. The effect of myo-inositol on follicular maturation was rapid, because the estrogen circulating concentration increased over the first week of treatment only in the myo-inositol group. A significant increase in circulating high-density lipoprotein was observed only in the myo-inositol-treated group. Metabolic risk factor benefits of myo-inositol treatment were not observed in the morbidly obese subgroup of patients. After 14-wk myo-inositol or placebo therapy, no change in fasting glucose concentrations, fasting insulin, or insulin responses to glucose challenge was recorded. There was an inverse relationship between body mass and treatment efficacy. In fact, a significant weight loss (and leptin reduction) was recorded in the myo-inositol group, whereas the placebo group actually increased weight. These data support a beneficial effect of myo-inositol in women with oligomenorrhea and PCOS in improving ovarian function.
BMI were observed. The hirsutism decreased after therapy. Total testosterone, FSH and LH concentrations decreased while estrogen concentrations increased. There was a slight non-significant decrease in total cholesterol concentrations, an increase in HDL cholesterol concentrations and a decrease in LDL cholesterol concentrations. No significant changes were observed in serum triglyceride, apolipoprotein B and lipoprotein(a) concentrations. Insulin resistance, analysed by homeostasis model assessment, was reduced significantly after therapy. Administration of oral myo-inositol significantly reduced hirsutism and hyperandrogenism and ameliorated the abnormal metabolic profile of women with hirsutism.
PCOS, display increased urinary clearance of D-chiro-inositol and decreased area under the curve of D-chiro-inositol-containing inositolphosphoglycan in association with higher insulin levels but independent of adiposity. Increased clearance of inositols might reduce tissue availability of D-chiro-inositol and decrease the release of D-chiro-inositol-containing inositolphosphoglycan mediator, which could contribute to insulin resistance and compensatory hyperinsulinemia.
Evidence suggests that some actions of insulin are effected by inositolphosphoglycan mediators. We hypothesize that a deficiency in D-chiro-inositol and/or a D-chiro-inositol-containing inositolphosphoglycan may contribute to insulin resistance in humans. The urinary clearance of D-Chiro-Inositol was increased almost sixfold in PCOS compared with normal women, but not myo-inositol clearance. Urinary clearance of D-Chiro-Inositol correlated inversely with insulin sensitivity when all women were analyzed together and was one of the three best independent parameters predicting insulin sensitivity. These findings are consistent with a defect in tissue availability or utilization of D-chiro-inositol in PCOS that may contribute to the insulin resistance of the syndrome. http://care.diabetesjournals.org/content/29/2/300.full
insulin signal transduction, cytoskeleton assembly, nerve guidance, intracellular calcium concentration control, cell membrane potential maintenance, serotonin activity modulation, breakdown of fats and reducing blood cholesterol, gene expression.
bran content, nuts, beans, and fruit, especially cantaloupe melons and oranges.