Maternal B12, Folate and Homocysteine Concentrations and Offspring Cortisol and Cardiovascular Responses to Stress

Abstract

Context Imbalances in maternal 1-carbon nutrients (vitamin B12, folate) have been shown to be associated with higher offspring cardiometabolic risk markers in India. Objective We examined the hypothesis that low plasma vitamin B12 (B12) and high folate and homocysteine concentrations in the mother are associated with higher hypothalamic–pituitary–adrenal axis (cortisol) and cardiovascular responses during the Trier Social Stress Test for Children (TSST-C) in an Indian birth cohort. Methods Adolescents (n = 264; mean age: 13.6 years), whose mothers’ plasma B12, folate and total homocysteine concentrations had been measured during pregnancy, completed 5-minutes each of public speaking and mental arithmetic tasks in front of 2 unfamiliar “judges” (TSST-C). Baseline and poststress salivary cortisol concentrations were measured. Heart rate, blood pressure, stroke volume, cardiac output, and total peripheral resistance were measured continuously at baseline, during the TSST-C, and for 10 minutes after the TSST-C using a finger cuff; beat-to-beat values were averaged for these periods, respectively. Results Maternal low B12 status (plasma B12 < 150 pmol/L) was associated with greater cortisol responses to stress in the offspring (P < .001). Higher homocysteine concentrations were associated with greater offspring heart rate response (P < .001). After adjustment for multiple comparisons, there were nonsignificant associations between higher maternal folate concentrations and offspring total peripheral resistance response (P = .01). Conclusion Our findings suggest that maternal 1-carbon nutritional status may have long-term programming implications for offspring neuroendocrine stress responses.

Maternal Vitamin B12 Status During Pregnancy and Its Association With Outcomes of Pregnancy and Health of the Offspring: A Systematic Review and Implications for Policy in India

“…One study (53) reported bone mineral density in offspring. Four studies (19,(54)(55)(56) reported maternal and birth characteristics in relation to offspring metabolic and cardiovascular outcomes and all of them were performed on ongoing longitudinal prospective birth cohorts (Supplementary Table 6).…”

“…Another study (55) from the Mysore cohort examined cortisol and cardiovascular responses to a stress test in adolescents (at 13.5yrs) and found that vitamin B12 deficiency in mothers and a higher homocysteine was associated with a greater cortisol response (B=0.36 95%CI 0.16, 0.57) and greater heart rate response (B=0.13, p=0.01) respectively. A study (56) in offspring aged 3 to 8 years, examined cardiac autonomic nerve activity as measured by heart rate variability (HRV) in relation to maternal vitamin B12 status.…”