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colorectal physiology

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https://www.readbyqxmd.com/read/28811361/chemoradiotherapy-resistance-in-colorectal-cancer-cells-is-mediated-by-wnt-%C3%AE-catenin-signaling
#1
Georg Emons, Melanie Spitzner, Sebastian Reineke, Janneke Möller, Noam Auslander, Frank Kramer, Yue Hu, Tim Beissbarth, Hendrik A Wolff, Margret Rave-Fränk, Elisabeth Heßmann, Jochen Gaedcke, B Michael Ghadimi, Steven Johnsen, Thomas Ried, Marian Grade
Activation of Wnt/β-catenin signaling plays a central role in the development and progression of colorectal cancer (CRC). The Wnt-transcription factor, TCF7L2, is overexpressed in primary rectal cancers that are resistant to chemoradiotherapy (CRT) and TCF7L2 mediates resistance to CRT. However, it is unclear whether the resistance is mediated by a TCF7L2 inherent mechanism or Wnt/β-catenin signaling in general. Here, inhibition of β-catenin by siRNAs or a small molecule inhibitor (XAV-939) resulted in sensitization of CRC cells to CRT...
August 15, 2017: Molecular Cancer Research: MCR
https://www.readbyqxmd.com/read/28801520/evidence-that-central-pathways-that-mediate-defecation-utilize-ghrelin-receptors-but-do-not-require-endogenous-ghrelin
#2
Ruslan V Pustovit, Brid Callaghan, Mitchell T Ringuet, Nicole F Kerr, Billie Hunne, Ian M Smyth, Claudio Pietra, John B Furness
In laboratory animals and in human, centrally penetrant ghrelin receptor agonists, given systemically or orally, cause defecation. Animal studies show that the effect is due to activation of ghrelin receptors in the spinal lumbosacral defecation centers. However, it is not known whether there is a physiological role of ghrelin or the ghrelin receptor in the control of defecation. Using immunohistochemistry and immunoassay, we detected and measured ghrelin in the stomach, but were unable to detect ghrelin by either method in the lumbosacral spinal cord, or other regions of the CNS In rats in which the thoracic spinal cord was transected 5 weeks before, the effects of a ghrelin agonist on colorectal propulsion were significantly enhanced, but defecation caused by water avoidance stress (WAS) was reduced...
August 2017: Physiological Reports
https://www.readbyqxmd.com/read/28790448/lrlshmda-laplacian-regularized-least-squares-for-human-microbe-disease-association-prediction
#3
Fan Wang, Zhi-An Huang, Xing Chen, Zexuan Zhu, Zhenkun Wen, Jiyun Zhao, Gui-Ying Yan
An increasing number of evidences indicate microbes are implicated in human physiological mechanisms, including complicated disease pathology. Some microbes have been demonstrated to be associated with diverse important human diseases or disorders. Through investigating these disease-related microbes, we can obtain a better understanding of human disease mechanisms for advancing medical scientific progress in terms of disease diagnosis, treatment, prevention, prognosis and drug discovery. Based on the known microbe-disease association network, we developed a semi-supervised computational model of Laplacian Regularized Least Squares for Human Microbe-Disease Association (LRLSHMDA) by introducing Gaussian interaction profile kernel similarity calculation and Laplacian regularized least squares classifier...
August 8, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28789681/study-protocol-on-comparative-effectiveness-of-mindfulness-meditation-and-qigong-on-psychophysiological-outcomes-for-patients-with-colorectal-cancer-a-randomized-controlled-trial
#4
Rainbow T H Ho, Adrian H Y Wan, Jessie S M Chan, S M Ng, K F Chung, Cecilia L W Chan
BACKGROUND: Colorectal cancer imposes threats to patients' well-being. Although most physical symptoms can be managed by medication, psychosocial stressors may complicate survival and hamper quality of life. Mindfulness and Qigong, two kinds of mind-body exercise rooted in Eastern health philosophy, has been found effective in symptoms management, improving mental health, and reducing stress. With these potential benefits, a randomized controlled trial (RCT) is planned to investigate the comparative effectiveness of mindfulness and Baduanjin intervention on the bio-psychosocial wellbeing of people with colorectal cancer...
August 8, 2017: BMC Complementary and Alternative Medicine
https://www.readbyqxmd.com/read/28757473/functions-and-regulations-of-the-hippo-signaling-pathway-in-intestinal-homeostasis-regeneration-and-tumorigenesis
#5
Gu Yuan, Zhang Lei, Yu Faxing
The intestine is an important digestive organ. Intestinal diseases such as acute or chronic enteritis and colorectal cancer pose a great threat to human health, which endows the studies related to intestine with great scientific and clinical value. The Hippo signaling pathway plays an important role in proliferation and differentiation of intestinal stem cells, and is involved in diverse physiological and pathological processes in the intestine. In this review, we summarize known functions and mechanisms of the Hippo signaling pathway in intestinal regeneration and tumorigenesis, provide a prospective on future research directions, and discuss potential therapeutic strategies targeting the Hippo signaling pathway...
July 20, 2017: Yi Chuan, Hereditas
https://www.readbyqxmd.com/read/28754313/the-5-ht4-receptor-mediated-inhibition-of-visceral-nociceptive-neurons-in-the-rat-caudal-ventrolateral-medulla
#6
O A Lyubashina, I B Sivachenko
Activation of the serotonin type 4 (5-HT4) receptors has been reported to improve abdominal pain in patients with functional gastrointestinal disorders and reduce visceral nociception in animal models. Earlier studies have proposed that 5-HT4 agonist can produce visceral analgesia by acting at the supraspinal level, but the underlying neuronal mechanisms remain unclear. The caudal ventrolateral medulla (CVLM) is the first site for processing of visceral nociceptive signals ascending via spinal pathways and an important component of the endogenous pain modulatory system...
July 25, 2017: Neuroscience
https://www.readbyqxmd.com/read/28750235/investigation-of-the-effect-of-plasma-albumin-levels-on-regorafenib-induced-hepatotoxicity-using-a-validated-liquid-chromatography-tandem-mass-spectrometry-method
#7
Yi Yun Pang, Yeong Lan Tan, Han Kiat Ho
Regorafenib is an oral multikinase inhibitor indicated for metastatic colorectal cancer and gastrointestinal stromal tumour. Due to its extensive plasma protein binding and low calculated hepatic extraction ratio, the hepatotoxicity observed with usage of the drug may be related to its plasma exposure. To investigate the highly dynamic free:bound drug concentration for regorafenib in the plasma, a bioanalytical liquid chromatography-tandem mass spectrometric assay was developed and validated in human plasma...
July 17, 2017: Journal of Chromatography. B, Analytical Technologies in the Biomedical and Life Sciences
https://www.readbyqxmd.com/read/28730759/surgical-treatment-for-colorectal-cancer-in-octogenarians-and-nonagenarians
#8
Young Wan Kim
Advances in surgical techniques and perioperative care have improved cancer-related outcomes. However, there are still concerns regarding the safety of octogenarian and nonagenarian patients during surgery. Clinicians may be reluctant to perform a radical resection for colorectal cancer and administer adjuvant or palliative cytotoxic chemotherapy to octogenarian and nonagenarian patients. In the elderly, setting a primary goal based on multidisciplinary team discussions prior to treatment is important. The overall treatment scheme, risks, and potential benefits should be discussed with elderly patients and their families...
May 2017: Journal of B.U.ON.: Official Journal of the Balkan Union of Oncology
https://www.readbyqxmd.com/read/28722097/-research-progress-of-the-association-of-hydrogen-sulfide-with-colorectal-cancer-and-its-associated-anti-tumor-drugs
#9
Shanwen Chen, Pengyuan Wang, Yucun Liu
As the third confirmed gaseous transmitters, hydrogen sulfide was found to play a vital role in the eternal milieu both physiologically and pathologically. What's intriguing is that, there exists a debate about the role of hydrogen sulfide in the pathogenesis of cancer, especially colorectal cancer. In this manuscript, progress of the effect of low and high dose hydrogen sulfide on the tumorigenesis of colorectal cancer and research on the antitumor new drugs stemmed from the function of hydrogen sulfide is summarized...
July 25, 2017: Zhonghua Wei Chang Wai Ke za Zhi, Chinese Journal of Gastrointestinal Surgery
https://www.readbyqxmd.com/read/28721811/moving-to-the-rhythm-with-clock-circadian-genes-autophagy-mtor-and-sirt1-in-degenerative-disease-and-cancer
#10
Kenneth Maiese
BACKGROUND: The mammalian circadian clock and its associated clock genes are increasingly be recognized as critical components for a number of physiological and disease processes that extend beyond hormone release, thermal regulation, and sleep-wake cycles. New evidence suggests that clinical behavior disruptions that involve prolonged shift work and even space travel may negatively impact circadian rhythm and lead to multi-system disease. METHODS: In light of the significant role circadian rhythm can hold over the body's normal physiology as well as disease processes, we examined and discussed the impact circadian rhythm and clock genes hold over lifespan, neurodegenerative disorders, and tumorigenesis...
July 17, 2017: Current Neurovascular Research
https://www.readbyqxmd.com/read/28713989/effects-of-proton-beam-irradiation-on-mitochondrial-biogenesis-in-a-human-colorectal-adenocarcinoma-cell-line
#11
Byung Geun Ha, Sung Suk Jung, Yun Hee Shon
Proton beam therapy has recently been used to improve local control of tumor growth and reduce side-effects by decreasing the global dose to normal tissue. However, the regulatory mechanisms underlying the physiological role of proton beam radiation are not well understood, and many studies are still being conducted regarding these mechanisms. To determine the effects of proton beams on mitochondrial biogenesis, we investigated: mitochondrial DNA (mtDNA) mass; the gene expression of mitochondrial transcription factors, functional regulators, and dynamic-related regulators; and the phosphorylation of the signaling molecules that participate in mitochondrial biogenesis...
July 5, 2017: International Journal of Oncology
https://www.readbyqxmd.com/read/28708826/intestinal-stem-cell-overproliferation-resulting-from-inactivation-of-the-apc-tumor-suppressor-requires-the-transcription-cofactors-earthbound-and-erect-wing
#12
Ai Tian, Hassina Benchabane, Zhenghan Wang, Chloe Zimmerman, Nan Xin, Jessica Perochon, Gabriela Kalna, Owen J Sansom, Chao Cheng, Julia B Cordero, Yashi Ahmed
Wnt/β-catenin signal transduction directs intestinal stem cell (ISC) proliferation during homeostasis. Hyperactivation of Wnt signaling initiates colorectal cancer, which most frequently results from truncation of the tumor suppressor Adenomatous polyposis coli (APC). The β-catenin-TCF transcription complex activates both the physiological expression of Wnt target genes in the normal intestinal epithelium and their aberrantly increased expression in colorectal tumors. Whether mechanistic differences in the Wnt transcription machinery drive these distinct levels of target gene activation in physiological versus pathological states remains uncertain, but is relevant for the design of new therapeutic strategies...
July 2017: PLoS Genetics
https://www.readbyqxmd.com/read/28684938/sexual-dysfunction-and-intimacy-for-ostomates
#13
REVIEW
Jeffrey A Albaugh, Sandi Tenfelde, Dana M Hayden
Sex and intimacy presents special challenges for the ostomate. Since some colorectal surgery patients will require either temporary or permanent stomas, intimacy and sexuality is a common issue for ostomates. In addition to the stoma, nerve damage, radiotherapy, and chemotherapy are often used in conjunction with stoma creation for cancer patients, thereby adding physiological dysfunction to the personal psychological impact of the stoma, leading to sexual dysfunction. The purpose of this paper is to describe the prevalence, etiology, and the most common types of sexual dysfunction in men and women after colorectal surgery and particularly those patients with stomas...
July 2017: Clinics in Colon and Rectal Surgery
https://www.readbyqxmd.com/read/28643625/microbial-interactions-and-interventions-in-colorectal-cancer
#14
Terence Van Raay, Emma Allen-Vercoe
Recently, several lines of evidence that indicate a strong link between the development of colorectal cancer (CRC) and aspects of the gut microbiota have become apparent. However, it remains unclear how changes in the gut microbiota might influence carcinogenesis or how regional organization of the gut might influence the microbiota. In this review, we discuss several leading theories that connect gut microbial dysbiosis with CRC and set this against a backdrop of what is known about proximal-distal gut physiology and the pathways of CRC development and progression...
June 2017: Microbiology Spectrum
https://www.readbyqxmd.com/read/28636998/physiologically-based-pharmacokinetic-modeling-for-predicting-irinotecan-exposure-in-human-body
#15
Yingfang Fan, Najia Mansoor, Tasneem Ahmad, Rafeeq Alam Khan, Martin Czejka, Syed Sharib, Dong-Hua Yang, Mansoor Ahmed
Colorectal cancer is the third leading cause of cancer-related deaths in the United States. Treatment of colorectal cancer remains a challenge to clinicians as well as drug developers. Irinotecan, a Camptothecin derivative, is successfully used for the treatment of this rapidly progressing malignancy and finds its place in the first line of therapeutic agents. Irinotecan is also effective in treating SCLC, malignant glioma and pancreatic adenocarcinoma. However, its adverse effects limit its clinical application...
July 18, 2017: Oncotarget
https://www.readbyqxmd.com/read/28623901/biomarker-correlation-network-in-colorectal-carcinoma-by-tumor-anatomic-location
#16
Reiko Nishihara, Kimberly Glass, Kosuke Mima, Tsuyoshi Hamada, Jonathan A Nowak, Zhi Rong Qian, Peter Kraft, Edward L Giovannucci, Charles S Fuchs, Andrew T Chan, John Quackenbush, Shuji Ogino, Jukka-Pekka Onnela
BACKGROUND: Colorectal carcinoma evolves through a multitude of molecular events including somatic mutations, epigenetic alterations, and aberrant protein expression, influenced by host immune reactions. One way to interrogate the complex carcinogenic process and interactions between aberrant events is to model a biomarker correlation network. Such a network analysis integrates multidimensional tumor biomarker data to identify key molecular events and pathways that are central to an underlying biological process...
June 17, 2017: BMC Bioinformatics
https://www.readbyqxmd.com/read/28599275/dicer-suppresses-cytoskeleton-remodeling-and-tumorigenesis-of-colorectal-epithelium-by-mir-324-5p-mediated-suppression-of-hmgxb3-and-wasf-2
#17
Li Na Sun, Cheng Xing, Zheng Zhi, Yao Liu, Liang-Yan Chen, Tong Shen, Qun Zhou, Yu Hong Liu, Wen Juan Gan, Jing-Ru Wang, Yong Xu, Jian Ming Li
Emerging evidence indicates that microRNAs, a class of small and well-conserved noncoding RNAs, participate in many physiological and pathological processes. RNase III endonuclease DICER is one of the key enzymes for microRNA biogenesis. Here, we found that DICER was downregulated in tumor samples of colorectal cancer (CRC) patients at both mRNA and protein levels. Importantly, intestinal epithelial cell (IEC)-specific deletion of Dicer mice got more tumors after azoxymethane and dextran sulfate sodium (DSS) administration...
May 25, 2017: Oncotarget
https://www.readbyqxmd.com/read/28593575/the-role-of-herg1-ion-channels-in-epithelial-mesenchymal-transition-and-the-capacity-of-riluzole-to-reduce-cisplatin-resistance-in-colorectal-cancer-cells
#18
Angelo Fortunato
PURPOSE: The transition of cells from the epithelial to the mesenchymal state (EMT) plays an important role in tumor progression. EMT allows cells to acquire mobility, stem-like behavior and resistance to apoptosis and drug treatment. These features turn EMT into a central process in tumor biology. Ion channels are attractive targets for the treatment of cancer since they play critical roles in controlling a wide range of physiological processes that are frequently deregulated in cancer...
August 2017: Cellular Oncology (Dordrecht)
https://www.readbyqxmd.com/read/28588875/management-of-chronic-constipation-in-adults
#19
REVIEW
K Krogh, G Chiarioni, W Whitehead
Chronic constipation (CC) is an extremely common condition with an estimated prevalence of up to 24%. Most patients with CC should be treated in primary care. Changes in lifestyle, including increased intake of dietary fibre, fluid, and exercise, should be attempted in most patients. Osmotic or stimulant laxatives are indicated if there are insufficient effects of lifestyle changes. Prokinetics and secretagogues should be restricted to those not responding to basic treatment. Anorectal physiology tests and assessment of colorectal transit time are indicated if medical treatment fails or if symptoms indicate severely obstructed defecation...
June 2017: United European Gastroenterology Journal
https://www.readbyqxmd.com/read/28579842/short-and-long-term-health-consequences-of-sleep-disruption
#20
REVIEW
Goran Medic, Micheline Wille, Michiel Eh Hemels
Sleep plays a vital role in brain function and systemic physiology across many body systems. Problems with sleep are widely prevalent and include deficits in quantity and quality of sleep; sleep problems that impact the continuity of sleep are collectively referred to as sleep disruptions. Numerous factors contribute to sleep disruption, ranging from lifestyle and environmental factors to sleep disorders and other medical conditions. Sleep disruptions have substantial adverse short- and long-term health consequences...
2017: Nature and Science of Sleep
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