Escaping the manosphere New light shed on who benefits most from weight-loss… 'Month of worry' over doctor strike surgery delay Subcutaneous spesolimab 1-ml formulation for prevent… Hospitals coping well with doctors' strike so far - … Researchers look into island's health benefits 'Doctors thought my endometriosis was IBS' Strike reduces A&E unit to minor injuries service What is vegan collagen? 'We will end up with an NHS without doctors' Escaping the manosphere New light shed on who benefits most from weight-loss… 'Month of worry' over doctor strike surgery delay Subcutaneous spesolimab 1-ml formulation for prevent… Hospitals coping well with doctors' strike so far - … Researchers look into island's health benefits 'Doctors thought my endometriosis was IBS' Strike reduces A&E unit to minor injuries service What is vegan collagen? 'We will end up with an NHS without doctors'

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Practice Pearls

Clinically actionable tips, one point at a time

Short, practical clinical insights tied to guidelines, trials, and mechanism explainers.

Cardiology / Cardiovascular

3-Hydroxy-3-methylglutaryl coenzyme A (HMG-CoA) reductase catalyses the rate-limiting step in the mevalonate pathway — the conversion of HMG-CoA to mevalonate — which is the committed step in hepatic cholesterol biosynthesis.

Cardiology / Cardiovascular

Statins are structural analogues of HMG-CoA that competitively inhibit HMG-CoA reductase with approximately 1,000-fold greater affinity than the natural substrate.

Cardiology / Cardiovascular

Reduced intracellular cholesterol synthesis in hepatocytes triggers compensatory upregulation of LDLR expression via SREBP-2 transcription factor activation, increasing hepatocyte LDL-C uptake from plasma and lowering circulating LDL-C levels by 30-55% depending on statin potency and dose.

Cardiology / Cardiovascular

Statins are stratified by their intensity of LDL-C lowering: high-intensity statins (atorvastatin 40-80mg, rosuvastatin 20-40mg) reduce LDL-C by approximately 50% or more; moderate-intensity statins (atorvastatin 10-20mg, rosuvastatin 5-10mg, simvastatin 20-40mg) by 30-50%; and low-intensity statins by less than 30%.

Gastroenterology

Sphingosine-1-phosphate (S1P) is a bioactive sphingolipid metabolite generated by sphingosine kinase-mediated phosphorylation of sphingosine, which is in turn derived from ceramide catabolism.

Gastroenterology

S1P is present at high concentrations in blood and lymph but at low levels in lymphoid organs, establishing a chemotactic gradient that drives lymphocyte egress.

Gastroenterology

Naive and central memory T-cells and B-cells upregulate S1P receptor 1 (S1PR1) upon maturation in the thymus and lymph node respectively; sensing the S1P gradient, they egress into the circulation via S1PR1-mediated signalling through Gi-coupled pathways.

Gastroenterology

Re-entry into lymphoid organs downregulates S1PR1 via receptor internalisation, resetting the egress machinery.

The MAPK signalling cascade (RAS-RAF-MEK-ERK) transmits extracellular growth signals from receptor tyrosine kinases to the nucleus, governing cell proliferation, differentiation, and survival.

BRAF is a serine/threonine kinase in this cascade, normally activated transiently by RAS-GTP.

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