Insulin-Like Growth Factor (IGF) System in the Bovine Mammary Gland and Milk

Primary bovine mammary cells express the two IGF receptors (IGF-IR, IGF-IIR),⁴ insulinreceptor, and four IGFBPs (IGFBP-2, -3, -4, and -5). Examination of the IGF-IR during themammary gland lactation cycle shows that IGF-IR number declines at parturition, a changethat coincides with decreases in the blood level of its ligand, IGF-I. IGF-II and IGF-IIR arelargely unchanged. IGFBP-3 is the predominant mammary IGFBP and its concentration alsodeclines in blood and milk during lactation compared to prepartum and involution periods.Time of lactation and pregnancy were the main determinants of milk but not bloodIGFBP-3 levels. IGFBP-3 binds to membrane proteins of bovine mammary tissue; an IGFBP-3 bindingprotein has been identified as bovine lactoferrin. Lactoferrin has the capacity to compete withIGF binding to IGFBP-3. Appearance of both IGFBP-3 and lactoferrin in conditioned mediaof primary cultures of bovine mammary cells was stimulated by all trans retinoic acid (atRA).Furthermore, atRA was necessary for the entry of exogenously added lactoferrin into themammary cell nucleus, while IGFBP-3 entry into the nuclei of atRA treated cells requiredthe presence of lactoferrin. These findings reveal a novel role for lactoferrin, suggesting thatlactoferrin is critically involved in the regulation of the IGF system during the involution period.     

Use of pelvic ultrasound in the diagnosis of megarectum in children with constipation

Purpose

It has not been possible so far to differentiate slow transit constipation from functional fecal retention because the existing medical literature lacks data on rectal dimensions for healthy children or children with chronic idiopathic constipation (CIC). We, for the first time, describe the use of pelvic ultrasound (US) to achieve this.

Methods

A pelvic US was carried out on 82 children with a full or partially full bladder and with no history of bowel problems and on 95 children with CIC. The rectal crescent seen behind the bladder was measured. All children also had documentation of their age, weight, and height.

Results

The median age, weight, and height for the healthy children were comparable with those of the children with CIC. The median rectal crescent size in children with constipation was 3.4 cm (range, 2.10-7.0; IQR, 1.0), as compared with 2.4 cm (range, 1.3-4.2; IQR, 0.72) in the healthy children, and this difference is statistically significant on multiple regressions of log for rectal diameter, adjusted for height, weight, and age (P value< .001).

Conclusion

Pelvic US is a quick child-friendly investigation, which can be used to document the presence of megarectum. It should be the first line investigation for all the children with CIC.     

Characteristics of abortion care seekers in south-western Nigeria

This prospective hospital-based study was carried out to understand the characteristics of abortion care seekers in south-western Nigeria. Information was obtained from a total of 1876 women seeking abortion at hospitals using a questionnaire. The results show that majority (60%) were between the ages of 15 and 24 years, of which adolescents between the ages of 15 and 19 years constituted 23.7%. Most (63.2%) of the respondents were unmarried, but married women also constituted a significant proportion (30.2%) of the abortion care seekers. Students were the single highest group, while the predominant economic activity was trading (26.7%). Respondents terminated their pregnancies mainly because they were students or because they did not desire to have children. Most (35.5%) of the women were introduced to providers by friends. Average contraceptive prevalence among the abortion care seekers was 27.4%. It is obvious from the results that young persons, especially in-school adolescents, should be targeted for comprehensive sexuality education especially in view of the current HIV/AIDS pandemic.     

Promoting sexual and reproductive health and rights in Nigeria through change in medical school curriculum

Significant developments have occurred in the field of sexual and reproductive health and rights (SRHR) globally in the last decade. However, this is yet to translate into improved status of SRHR in developing countries. One of the strategies recognised worldwide for addressing the poor status of SRHR is human capacity building at all levels. A pilot work conducted in two federal university medical schools identified a major gap in knowledge among medical students on issues related to SRHR. This called for a review of the curriculum to enable the incorporation of relevant and topical issues. This article describes the processes leading to the adoption of the Nigerian medical schools' sexual and reproductive health and rights curriculum. The exercise culminated in the identification of internal and external stakeholders and needs of the Nigerian medical schools in teaching reproductive health. The participation of lecturers (bottom-up approach) brought about a sense of ownership of the document and promoted the broad consultation and participation of all participants. It also identified capacity building and the need for evaluation as a basis for further review.     

Prevalence of Hypertension among Urban Slum Dwellers in Lagos, Nigeria

Urban slum dwellers are not only prone to develop communicable diseases but also to non-communicable disease (NCDs). The extent and magnitude of NCDs among slum dwellers is largely unknown in Nigeria. A total of 964 adults aged 20–81 years (male 330 and female 634) residing in the urban slum of Ajegunle in Lagos State, Nigeria were studied to determine the prevalence of hypertension and associated factors. The overall prevalence of hypertension was 38.2 %. Of the 368 respondents identified as having hypertension, only 50 (5.2 %) respondents were previously aware of their diagnosis. Of the 50 known hypertensive patients, 48(96 %) had poor control of their high blood pressure. The socio-demographic factors significantly associated with hypertension status were age, sex, education, religion, BMI, and marital status. The study concludes a high prevalence of hypertension among urban slums dwellers in Lagos. The need for government to develop policies for the control of hypertension, improve access to early diagnosis and provide an enabling socioeconomic environment while promoting healthy living.     

Characterization of a myosin-like antigen from Onchocerca volvulus

Recombinant cDNAs expressing an immunodominant antigen (Onchoag-1) of Onchocerca volvulus were identified by immunoscreening a cDNA expression library. The Onchoag-1 cDNAs are derived from an 8-kb mRNA that codes for a protein with an apparent molecular mass of 200 kDa. Indirect immunofluorescence using antisera against a recombinant fusion protein showed that Onchoag-1 is located in the muscle tissues of adult O. volvulus. The 2-kb sequence of one of the cDNAs contains a single open translation reading frame that encodes a protein with sequence similarities to Caenorhabditis elegans myosin heavy chain. Analysis of the 3′ region of Onchoag-1 chromosomal gene reveals that it is frequently interrupted by short introns that follow the GT/AG rule at their splice sites. Studies on this myofibrillar antigen should contribute to our understanding of muscle function in O. volvulus as well as provide useful insight to the genesis of the immunopathological damage that is often associated with allergic reactions (the Mazzotti reactions) in onchocerciasis patients, following the administration of a chemotherapeutic agent such as diethylcarbamazine.     

Human infant respiratory syncytial virus (RSV)-specific type 1 and 2 cytokine responses ex vivo during primary RSV infection

BACKGROUND: Respiratory syncytial virus (RSV) infection is the most common respiratory viral infection resulting in hospitalizations in infants worldwide. Illness severity is likely multifactorial; however, unlike other viral infections, both type 1 and type 2 cytokine responses have been implicated in severe disease. METHODS: We measured RSV-specific cytokine responses ex vivo during primary RSV infection in the blood of 18 infants with polymerase chain reaction-confirmed RSV infection. To focus on primary RSV infection, subjects were all<9 months old. RSV-specific cytokine responses were measured at 3 time points during acute primary RSV infection and at 1 memory time point 3-6 months later. RESULTS: RSV-specific interferon (IFN)- gamma responses were detected in 10 of 18 of infants. Infants with mild disease had higher RSV-specific IFN- gamma memory responses than did those with moderate or severe disease. No consistent correlations between RSV-specific IFN- gamma responses and corticosteroid administration were observed. RSV-specific interleukin (IL)-4 or IL-5 responses to primary RSV infection were detectable in 5 of 18 and 8 of 15 infants, respectively. CONCLUSIONS: During primary RSV infection, many infants demonstrated RSV-specific IFN- gamma responses. The strongest IL-4 and IL-5 responses were detected in 3 infants with severe disease, suggesting that type 2 responses may contribute to the pathogenesis of severe disease.