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By Jamshed Arslan, Pharm. D., PhD.
The cellular pathway comprising tyrosine kinase Janus Kinase (JAK) and the transcription factor STAT connect extracellular signals from various cytokines, hormones and growth factors with the nuclear transcription machinery. Four JAK proteins (JAK1, JAK2, JAK3, TYK2) and seven...
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By Christina Towers, PhD
A novel vesicular organelle was recently discovered in 2015 by a research group at Tsinghua University headed by Dr. Yu that is dependent on cell migration and named accordingly as migrasomes1. They are classified as extracellular...
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By Christina Towers, PhD
The selective degradation of mitochondria via double membrane autophagosome vesicles is called mitophagy. Damaged mitochondria can generate harmful amounts of reactive oxygen species (ROS), accumulate damaged mitochondrial DNA, and induce cell death. Mitophagy functions in coordination with mitochondrial biogenesis and changes in mitochondrial dynamics to maintain...
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By Jamshed Arslan, Pharm. D., PhD.
Novel coronavirus or SARS-CoV-2 has gripped the entire world. Infected individuals keep shedding the virus in respiratory droplets even before showing symptoms because of high viral load in their upper respiratory tract. The virus is also detectable in blood and feces of the infected people. COVID-19 symptoms mainly include fever, fatigue, dry cough and difficulty breathing, which may develop into severe pneumonia. To...
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By Jamshed Arslan, Pharm. D., PhD.
The most common chronic liver disorder worldwide is non-alcoholic fatty liver disease (NAFLD). This obesity-linked disorder can manifest as hepatic fat accumulation (steatosis) with inflammation called non-alcoholic steatohepatitis (NASH). NASH can progress to fibrosis, cirrhosis and cancer. Stress conditions and impaired autophagy can contribute to steatosis and fibrosis. Stressors like ...
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By Jamshed Arslan, Pharm. D., PhD.
Coronaviruses are a family of enveloped RNA viruses. Some family members circulate in human populations, but others like severe acute respiratory syndrome coronavirus (SARS-CoV) are transmitted from animals to humans. A new strain of coronaviruses called novel coronavirus (nCOV) or SARS-CoV-2 is also transmitted zoonotically. SARS-CoV-2 has caused a global infectious disease called COVID-19. A person catches this notorious illness when he/she comes in contact with respiratory...
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By Christina Towers, PhD
Mitochondrial turn over via the lysosome, otherwise known as mitophagy, involves engulfment of mitochondria into double membrane autophagosomes and subsequent fusion with lysosomes. Much is already known about this process including the canonical and non-canonical mechanisms of action, the critical machinery involved, as well as the...
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By Jamshed Arslan, Pharm. D., PhD.
Insulin resistance in adipocytes is a major feature of metabolic syndrome . Disrupted adipose tissue metabolism can lead to accumulation of lipid intermediates in insulin-sensitive tissues like liver and skeletal muscles, thereby diminishing insulin sensitivity. A key enzyme in adipocytes that mobilizes free fatty acids from adipose tissue into the bloodstream is...
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By Michalina Hanzel, PhD
The microbiota-gut-brain axis is a bidirectional relationship between the central and enteric nervous systems, which is heavily influenced by the microorganisms living in the gut. Accumulating evidence has pointed to the microbiome, composed mostly of bacteria, but also including archaea, fungi and viruses, as instrumental in maintaining human physiological functions.1 Importantly, the brain is influenced by various bacterial metabolites,...
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By Jamshed Arslan, Pharm. D., PhD.
We live in a world where 39% of adults are overweight. Our meals trigger the secretion of various gut-derived metabolic hormones called incretins. Fats and carbohydrates in our diet stimulate the release of an incretin from the duodenum called glucose-dependent insulinotropic polypeptide or gastric inhibitory polypeptide (GIP). GIP acts on its receptor (GIPR) in adipocytes and pancreas to promote fatty acid uptake and insulin...
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By Christina Towers, PhD
Over the last two decades the field of autophagy has exploded! Innovative techniques, comprehensive analysis and disease-relevant models have yielded basic and clinical discoveries of consequence. The Nobel Prize for Physiology or Medicine was awarded to Dr. Yoshinori Ohsumi in 2016, for his ground-breaking work in yeast to identify many of the core autophagy proteins. Since then, the field has only expanded. In just the past year, the field has produced numerous...
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By Jamshed Arslan, Pharm. D., PhD.
The hypothalamus is an insulin receptor-rich brain region. Insulin receptor signaling in the CNS can regulate blood pressure, for example, by increasing sympathetic outflow to the cardiovascular organs. However, the cardiometabolic impact of deleting insulin receptors only in the hypothalamic region is different from deleting insulin receptors in the whole brain. In other words, insulin signaling outside the hypothalamus is also important for cardioregulatory activities. To explore this extra-hypothalamic insulin signaling, scientists from...
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By Jennifer Sokolowski, MD, PhD.
On and in our bodies, microbes outnumber our cells by about ten-to-one. Studies have revealed that the microbiome influences neurogenesis, cognition, and stress responses, leading to increased interest in identifying factors that affect the gut microbiota, and a drive to understand pathways involved in the gut-brain axis.1
The composition of microbiota in the gut affects the...
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By Michalina Hanzel, PhD
Astrocytes are a type of macroglia found in the central nervous system that regulate a vast array of essential brain functions, ranging from synaptogenesis, ion homeostasis and maintenance of the blood-brain barrier, to buffering of neurotransmitters and secretion of neuroactive agents. Considering the plethora of roles that astrocytes...
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By Jamshed Arslan, Pharm. D., PhD.
Generating energy (ATP) from nutrients is a recipe for life. One of the sensors of cellular energy levels is the serine/threonine kinase AMPK. This enzyme facilitates lipid oxidation and glucose uptake when energy levels fall, thereby promoting ATP production. AMPK comprises a catalytic alpha subunit with two regulatory subunits,...
By Christina Towers, PhD
The majority of cancer patients die from metastatic disease at secondary sites. The threshold to undergo metastasis is high. Only a minority of cancer cells acquire invasive phenotypes like motility and the ability to survive under detached conditions. Consistently, only few cancer cells acquire stem cell like properties, including a more mesenchymal morphology...
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By Jamshed Arslan, Pharm. D., PhD.
It was 1988 when, after decades of research, Dr. GM Reaven of the Stanford University, CA, explained the relationship between four diseases: insulin resistance, hypertension, diabetes and obesity....
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By Michalina Hanzel, PhD
Fused in sarcoma (FUS) is a ribonucleoprotein that continuously shuttles between the nucleus and the cytoplasm to regulate pre-mRNA splicing, mRNA stability and mRNA transport. Mutations in FUS are found in 4% familial and 1% sporadic cases of amyotrophic lateral...
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By Rosa Moreno, PhD.
Physiological low levels of oxygen induce normal hypoxic events across biological systems. This hypoxic state activates hypoxia inducible factors (HIFs) to regulate transcription by binding to the hypoxia response element (HRE) region of...
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By Jamshed Arslan, Pharm. D., PhD.
Stroke is a leading cause of mortality and morbidity worldwide. Cellular players – neurons, astrocytes, endothelial and stromal cells – involved in post-stroke repair through angiogenesis...
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By Jamshed Arslan, Pharm. D., PhD.
Gastroesophageal adenocarcinoma originates from the glandular epithelium of the esophagus, gastroesophageal junction and stomach. The incidence of gastroesophageal adenocarcinoma is declining, but it is still one of the deadliest cancers worldwide. A key reason behind high mortality is that by the time gastroesophageal adenocarcinoma is diagnosed, the cancer has often already metastasized. The search for novel biomarkers underlying gastroesophageal...
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By Victoria Osinski
There are many different immune cells (leukocytes) that are found in circulation along with other cellular components such as platelets and red blood cells. Red blood cells (RBCs) are the most abundant, followed by neutrophils and lymphocytes. The immune cells can be categorized as either mononuclear cells (monocytes and lymphocytes...
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By Jamshed Arslan, Pharm. D., PhD.
Protein phosphorylation refers to a reversible post-translational modification in which a protein kinase adds a phosphate group to an amino acid residue of a target protein. Protein phosphorylation, especially tyrosine phosphorylation, is one of the early events in signal transduction in all eukaryotic cells.
Once a cell is lysed, proteases and phosphatases are released that can degrade or...
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By Rachel M.A. Linger, Ph.D.
Survivin is a small (16.5 kDa) protein normally found in human fetal tissue. In contrast, survivin is typically undetectable in most normal adult tissues. Expression of survivin occurs in several subcellular locations including the cytoplasm, nucleus,...
![Expression of RhoA, B and C detected in the cytoplasm of A431 cells, a model of human epidermoid carcinoma, compared to negative control analyzed in the absence of RhoA Antibody (1A11-4G10) [NBP2-22528]](https://images.novusbio.com/design/RhoA-B-C-expression-A431-cells-header.jpg "RhoA, B and C expression in A431 cells, ICC")