Industry involvement in rheumatology consensus-based recommendations: a systematic review.

Consensus-based recommendations guide standards of care for clinical practice. Pharmaceutical industry involvement in producing such recommendations might undermine their objectivity. We did a systematic review of rheumatology consensus-based recommendations that were published in English from 2000 to 2020. We compared those that were endorsed by major professional societies to those that were sponsored by industry using the validated Appraisal of Guidelines for Research & Evaluation (AGREE) II instrument. Of 234 consensus-based recommendation projects, 51 (22%) were endorsed by major societies and 74 (32%) were sponsored by the pharmaceutical industry. Among industry-sponsored projects, the sponsor was involved in the consensus-based process in 21 (28%), provided a medical writer in 12 (16%), offered honoraria for participation in five (7%), and was allowed to approve the final draft of one project. When compared with projects endorsed by major societies, industry-sponsored projects were less likely to have a high quality assessment on the AGREE II instrument. These results suggest that industry sponsorship of consensus-based recommendations is common in projects that do not receive endorsement by major societies. Such projects are often of lower quality than guidelines endorsed by major professional societies. Medical journals should consider steps to encourage greater rigour of development and to limit undue influence by industry sponsors.

Targeted mutagenesis of mitochondrial carbonic anhydrases VA and VB implicates both enzymes in ammonia detoxification and glucose metabolism.

Prior studies with carbonic anhydrase (CA) inhibitors implicated mitochondrial CA in ureagenesis and gluconeogenesis. Subsequent studies identified two mitochondrial CAs. To distinguish the contribution of each enzyme, we studied the effects of targeted disruption of the murine CA genes, called Car5A and Car5B. The Car5A mutation had several deleterious consequences. Car5A null mice were smaller than wild-type littermates and bred poorly. However, on sodium-potassium citrate-supplemented water, they produced offspring in expected numbers. Their blood ammonia concentrations were markedly elevated, but their fasting blood sugars were normal. By contrast, Car5B null mice showed normal growth and normal blood ammonia levels. They too had normal fasting blood sugars. Car5A/B double-knockout (DKO) mice showed additional abnormalities. Impaired growth was more severe than for Car5A null mice. Hyperammonemia was even greater as well. Although fertile, DKO animals were produced in less-than-predicted numbers even when supplemented with sodium-potassium citrate in their drinking water. Survival after weaning was also reduced, especially for males. In addition, fasting blood glucose levels for DKO mice were significantly lower than for controls (153 ± 33 vs. 230 ± 24 mg/dL). The enhanced hyperammonemia and lower fasting blood sugar, which are both seen in the DKO mice, indicate that both Car5A and Car5B contribute to both ammonia detoxification (ureagenesis) and regulation of fasting blood sugar (gluconeogenesis). Car5A, which is expressed mainly in liver, clearly has the predominant role in ammonia detoxification. The contribution of Car5B to ureagenesis and gluconeogenesis was evident only on a Car5A null background.