The advent of antiretroviral therapies in 1996 prompted an interest in the role played by ancillary services in improving access to and retention in medical care, particularly since the success of the new therapies is often contingent upon ongoing and appropriate primary medical care. Using self-reported survey data from a longitudinal representative sample of 577 HIV-positive adults in New York City, this paper explores the impact of such supportive services as drug treatment, case management, housing assistance, mental health treatment and transportation on engagement with medical care. The study's principal finding was that specific ancillary services were significantly associated with an increase in an individual's likelihood of entering medical care and maintaining appropriate medical care services for HIV, particularly when the services addressed a corresponding need.
Osteocalcin is a hormone secreted by osteoblasts, which regulates energy metabolism by increasing β-cell proliferation, insulin secretion, insulin sensitivity, and energy expenditure. This has been demonstrated in mice, but to date, the evidence implicating osteocalcin in the regulation of energy metabolism in humans are indirect. To address this question more directly, we asked whether a benign osteoblastic tumor, such as osteoma osteoid in young adults, may secrete osteocalcin. The study was designed to assess the effect of surgical resection of osteoid osteoma on osteocalcin and blood glucose levels in comparison with patients undergoing knee surgery and healthy volunteers. Blood collections were performed the day of surgery and the following morning after overnight fasting. Patients and controls were recruited in the orthopedic surgery department of New York Presbiterian Hospital, NY-USA and Hospices Civils de Lyon, France. Seven young males were included in the study: two had osteoid osteoma, two underwent knee surgery, and three were healthy volunteers. After resection of the osteoid osteomas, we observed a decrease of osteocalcin by 62% and 30% from the initial levels. Simultaneously, blood glucose increased respectively by 32% and 15%. Bone turnover markers were not affected. This case study shows for the first time that osteocalcin in humans affects blood glucose level. This study also suggests that ostoid osteoma may be considered, at least in part, as an osteocalcinoma.
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