Breastfeeding Practices Among Hispanic and Non-Hispanic Women at the Postpartum Visit.

BACKGROUND: Breastfeeding is an active area in public health advocacy. Despite documented benefits for infants and mothers, exclusive breastfeeding is not universal. Ethnicity, among other variables, has been shown to influence breastfeeding practice. Research aim: Our study aimed to determine which variables are associated with infant feeding patterns at the postpartum visit; compare the sociodemographic variables associated with infant feeding patterns between Hispanic and non-Hispanic mothers; and determine the odds of exclusive breastfeeding, mixed feeding, and exclusive formula feeding associated with sociodemographic characteristics. METHODS: A retrospective, cross-sectional two-group comparison design was used. Hispanic and non-Hispanic women's ( N = 666) infant feeding patterns at 6-week postpartum were analyzed. Group comparisons were made of the demographic characteristics and infant feeding practice. RESULTS: Thirty-four percent of Hispanic participants reported exclusive breastfeeding compared with 59% of non-Hispanic White participants. Language and body mass index were significantly associated with infant feeding patterns among Hispanic participants. Compared with non-Hispanic White participants, Hispanic participants had increased odds of reporting mixed feeding and exclusive formula feeding. CONCLUSION: Breastfeeding initiatives should target English-speaking Hispanic mothers and obese Hispanic mothers to align breastfeeding rates with medical recommendations. Healthcare providers may benefit from additional training to address barriers to breastfeeding among obese women and to provide culturally sensitive support that encourages continued breastfeeding in this population.

The role of hepatocyte RXR alpha in xenobiotic-sensing nuclear receptor-mediated pathways.

Nuclear receptors constitutive androstane receptor (CAR) and pregnane X receptor (PXR) cross talk and serve as xenobiotic sensors to form a safety net against the toxic effects of harmful substances. Retinoid x receptor alpha (RXRalpha) dimerizes with CAR and PXR. In order to analyze the role of RXRalpha in these xeno-sensor-mediated pathways, hepatocyte RXRalpha-deficient mice were challenged by CAR and PXR ligands including androstanol, 1,4-bis[2-(3,5-dichloropyridyloxy)]benzene (TCPOBOP), and pregnenolone 16alpha-carbonitrile (PCN). We demonstrate that hepatocyte RXRalpha deficiency prevents TCPOBOP-induced hepatomegaly and morphological changes. We also show that in vivo the cytochrome P450 (CYP) genes including CYP2A5, CYP2B10, CYP3A1, but not CYP2E1 and CYP2D6, are the RXRalpha target genes. Androstanol, TCPOBOP, and PCN can differentially regulate the expression of these CYP450 genes. In addition, the most active peroxisome proliferator activated receptor (PPARalpha) ligand, Wy14,643, also regulates some of the xeno-sensor target genes such as CYP2A5 and CYP2B10 in vivo. Thus, the ligands of different nuclear receptors can regulate common CYP450 genes and hepatocyte RXRalpha is essential for xenobiotic metabolism in vivo.