Professor Penny Gowland's Outputs (42)

Assessing Water Content of the Human Colonic Chyme Using the MRI Parameter T1: A Key Biomarker of Colonic Function (2025)
Journal Article
Dellschaft, N., Murray, K., Ren, Y., Marciani, L., Gowland, P., Spiller, R., & Hoad, C. (2025). Assessing Water Content of the Human Colonic Chyme Using the MRI Parameter T1: A Key Biomarker of Colonic Function. Neurogastroenterology and Motility, 37(4), Article e14999. https://doi.org/10.1111/nmo.14999

Background
The human colon receives 2 L of fluid daily. Small changes in the efficacy of absorption can lead to altered stool consistency with diarrhea or constipation. Drugs and formulations can also alter colonic water, which can be assessed using... Read More about Assessing Water Content of the Human Colonic Chyme Using the MRI Parameter T1: A Key Biomarker of Colonic Function.

Magnetic Resonance Imaging Reveals Novel Insights into the Dual Mode of Action of Bisacodyl: A Randomized, Placebo-controlled Trial in Constipation (2024)
Journal Article
Aliyu, A., Dellschaft, N., Hoad, C., Williams, H., Gaudoin, E., Sulaiman, S., Crooks, C., Gowland, P., Alexia, A., Lange, R., Bois de Fer, B., Corsetti, M., Marciani, L., & Spiller, R. (2025). Magnetic Resonance Imaging Reveals Novel Insights into the Dual Mode of Action of Bisacodyl: A Randomized, Placebo-controlled Trial in Constipation. Clinical Pharmacology and Therapeutics, 177(5), 1284-1291. https://doi.org/10.1002/cpt.3532

Bisacodyl is a widely used laxative that stimulates both motility and secretion. Our aim was to exploit the unique capabilities of MRI to define bisacodyl's mode of action. Two placebo-controlled cross-over trials were performed, one using a single d... Read More about Magnetic Resonance Imaging Reveals Novel Insights into the Dual Mode of Action of Bisacodyl: A Randomized, Placebo-controlled Trial in Constipation.

Novel Use of Manganese Gluconate as a Marker for Visualization of Tablet Dissolution in the Fed Human Stomach Using Magnetic Resonance Imaging (2024)
Journal Article
Akbar, T., Gershkovich, P., Stamatopoulos, K., Gowland, P., Stolnik, S., Butler, J., & Marciani, L. (2025). Novel Use of Manganese Gluconate as a Marker for Visualization of Tablet Dissolution in the Fed Human Stomach Using Magnetic Resonance Imaging. Molecular Pharmaceutics, 22(1), 594-598. https://doi.org/10.1021/acs.molpharmaceut.4c00854

Magnetic resonance imaging (MRI) of dry or solid materials in the gastrointestinal (GI) tract requires the use of contrast agents to enhance visualisation of the dosage forms. In this study, we explore the novel use of manganese gluconate added to ta... Read More about Novel Use of Manganese Gluconate as a Marker for Visualization of Tablet Dissolution in the Fed Human Stomach Using Magnetic Resonance Imaging.

Combined magnetic resonance imaging, high resolution manometry and a randomised trial of bisacodyl versus hyoscine shows the significance of an enlarged colon in constipation: the RECLAIM study (2024)
Journal Article
Wilkinson-Smith, V., Scott, M., Menys, A., Wiklendt, L., MARCIANI, L., Atkinson, D., Sansone, S., Zdanavciene, A., Coupland, C., Knowles, C., Dinning, P., Taylor, S., Gowland, P., Hoad, C., Corsetti, M., & Spiller, R. (2025). Combined magnetic resonance imaging, high resolution manometry and a randomised trial of bisacodyl versus hyoscine shows the significance of an enlarged colon in constipation: the RECLAIM study. Gut, 74(1), 35-44. https://doi.org/10.1136/gutjnl-2024-332755

Background
Colonic motility in constipation can be assessed non-invasively using MRI.

Objective
To compare MRI with high resolution colonic manometry (HRCM) for predicting treatment response.

Design
Part 1: 44 healthy volunteers (HV), 43... Read More about Combined magnetic resonance imaging, high resolution manometry and a randomised trial of bisacodyl versus hyoscine shows the significance of an enlarged colon in constipation: the RECLAIM study.

A randomised crossover trial of tezacaftor-ivacaftor for gut dysfunction in cystic fibrosis with magnetic resonance imaging (MRI) outcomes. (2023)
Journal Article
Ng, C., Dellschaft, N. S., Hoad, C., Marciani, L., Spiller, R., Crooks, C., Hill, T., Menys, A., Mainz, J. G., Barr, H., Gowland, P. A., Major, G., & Smyth, A. R. (2023). A randomised crossover trial of tezacaftor-ivacaftor for gut dysfunction in cystic fibrosis with magnetic resonance imaging (MRI) outcomes. NIHR Open Research, 3(65), 1-16. https://doi.org/10.3310/nihropenres.13510.1

Background

People with cystic fibrosis (CF) can experience recurrent chest infections, pancreatic exocrine insufficiency and gastrointestinal symptoms. New cystic fibrosis transmembrane conductance regulator (CFTR) modulator drugs improve lung fun... Read More about A randomised crossover trial of tezacaftor-ivacaftor for gut dysfunction in cystic fibrosis with magnetic resonance imaging (MRI) outcomes..

Comparing magnetic resonance liver fat fraction measurements with histology in fibrosis: the difference between proton density fat fraction and tissue mass fat fraction (2022)
Journal Article
Bawden, S. J., Hoad, C., Kaye, P., Stephenson, M., Dolman, G., James, M. W., Wilkes, E., Austin, A., Guha, I. N., Francis, S., Gowland, P., & Aithal, G. P. (2023). Comparing magnetic resonance liver fat fraction measurements with histology in fibrosis: the difference between proton density fat fraction and tissue mass fat fraction. Magnetic Resonance Materials in Physics, Biology and Medicine, 36(4), 553-563. https://doi.org/10.1007/s10334-022-01052-0

Objective: Magnetic resonance spectroscopy (MRS) provides a powerful method of measuring fat fraction. However, previous studies have shown that MRS results give lower values compared with visual estimates from biopsies in fibrotic livers. This study... Read More about Comparing magnetic resonance liver fat fraction measurements with histology in fibrosis: the difference between proton density fat fraction and tissue mass fat fraction.

Pilot Double-Blind Randomised Controlled Trial: Effects of Jejunal Nutrition on Postprandial Distress in Diabetic Gastropathy (J4G Trial) (2022)
Journal Article
Carneiro, L., White, J., Parker, H., Hoad, C., Tucker, E., Marciani, L., Gowland, P., Gazis, T., Walker, M., & Fox, M. (2022). Pilot Double-Blind Randomised Controlled Trial: Effects of Jejunal Nutrition on Postprandial Distress in Diabetic Gastropathy (J4G Trial). Nutrients, 14(7), Article 1321. https://doi.org/10.3390/nu14071321

Nausea, vomiting and abdominal pain in diabetic patients are often attributed to diabetic gastropathy (DG). Post-pyloric (“jejunal”) enteral nutrition (JN) may improve nutrition and glycaemia in difficult cases. The acute effects of JN on postprandia... Read More about Pilot Double-Blind Randomised Controlled Trial: Effects of Jejunal Nutrition on Postprandial Distress in Diabetic Gastropathy (J4G Trial).

Quantitative magnetic resonance imaging in perianal crohn’s disease at 1.5 and 3.0 T: A feasibility study (2021)
Journal Article
Alyami, A., Hoad, C. L., Tench, C., Bannur, U., Clarke, C., Latief, K., Argyriou, K., Lobo, A., Lung, P., Baldwin-Cleland, R., Sahnan, K., Hart, A., Limdi, J. K., McLaughlin, J., Atkinson, D., Parker, G. J. M., O’Connor, J. P. B., Little, R. A., Gowland, P. A., & Moran, G. W. (2021). Quantitative magnetic resonance imaging in perianal crohn’s disease at 1.5 and 3.0 T: A feasibility study. Diagnostics, 11(11), Article 2135. https://doi.org/10.3390/diagnostics11112135

Perianal Crohn’s Disease (pCD) is a common manifestation of Crohn’s Disease. Absence of reliable disease measures makes disease monitoring unreliable. Qualitative MRI has been increasingly used for diagnosing and monitoring pCD and has shown potentia... Read More about Quantitative magnetic resonance imaging in perianal crohn’s disease at 1.5 and 3.0 T: A feasibility study.

Small bowel water content assessed by MRI in health and disease: a collation of single-centre studies (2021)
Journal Article
Dellschaft, N., Hoad, C., Marciani, L., Gowland, P., & Spiller, R. (2022). Small bowel water content assessed by MRI in health and disease: a collation of single-centre studies. Alimentary Pharmacology and Therapeutics, 55(3), 327-338. https://doi.org/10.1111/apt.16673

Background: New developments in MRI have allowed the non-invasive, accurate measurement of the small bowel water content (SBWC). Aims: To collate studies measuring SBWC following ingestion of a range of foods in both health and disease to provide dat... Read More about Small bowel water content assessed by MRI in health and disease: a collation of single-centre studies.

Effects of an isoenergetic low Glycaemic Index (GI) diet on liver fat accumulation and gut microbiota composition in patients with non-alcoholic fatty liver disease (NAFLD): A study protocol of an efficacy mechanism evaluation (2021)
Journal Article
Al-Awadi, A., Grove, J., Taylor, M., Valdes, A., Vijay, A., Bawden, S., Gowland, P., & Aithal, G. (2021). Effects of an isoenergetic low Glycaemic Index (GI) diet on liver fat accumulation and gut microbiota composition in patients with non-alcoholic fatty liver disease (NAFLD): A study protocol of an efficacy mechanism evaluation. BMJ Open, 11(10), Article e045802. https://doi.org/10.1136/bmjopen-2020-045802

Introduction A Low Glycaemic Index (LGI) diet is a proposed lifestyle intervention in non-alcoholic fatty liver diseases (NAFLD) which is designed to reduce circulating blood glucose levels, hepatic glucose influx, insulin resistance and de novo lipo... Read More about Effects of an isoenergetic low Glycaemic Index (GI) diet on liver fat accumulation and gut microbiota composition in patients with non-alcoholic fatty liver disease (NAFLD): A study protocol of an efficacy mechanism evaluation.

Assessing lymphatic uptake of lipids using magnetic resonance imaging: A feasibility study in healthy human volunteers with potential application for tracking lymph node delivery of drugs and formulation excipients (2021)
Journal Article
Jewell, A., Williams, H., Hoad, C. L., Gellert, P. R., Ashford, M. B., Butler, J., Stolnik, S., Scurr, D., Stocks, M. J., Marciani, L., Gowland, P. A., & Gershkovich, P. (2021). Assessing lymphatic uptake of lipids using magnetic resonance imaging: A feasibility study in healthy human volunteers with potential application for tracking lymph node delivery of drugs and formulation excipients. Pharmaceutics, 13(9), Article 1343. https://doi.org/10.3390/pharmaceutics13091343

Dietary lipids and some pharmaceutical lipid excipients can facilitate the targeted delivery of drugs to the intestinal lymphatics. Here, the feasibility of magnetic resonance imaging (MRI) for imaging lipid uptake into the intestinal lymphatics was... Read More about Assessing lymphatic uptake of lipids using magnetic resonance imaging: A feasibility study in healthy human volunteers with potential application for tracking lymph node delivery of drugs and formulation excipients.

Psyllium reduces insulin-induced colonic gas production in irritable bowel syndrome: MRI and in vitro fermentation studies (2021)
Journal Article
Gunn, D., Abbas, Z., Harris, H., Major, G., Hoad, C., Gowland, P., Marciani, L., Gill, S., Warren, F., Rossi, M., Remes-Troche, J., Whelan, K., & Spiller, R. (2022). Psyllium reduces insulin-induced colonic gas production in irritable bowel syndrome: MRI and in vitro fermentation studies. Gut, 71(5), 919-927. https://doi.org/10.1136/gutjnl-2021-324784

Objective: Health promoting dietary fibre including inulin often triggers gastrointestinal symptoms in patients with irritable bowel syndrome (IBS), limiting their intake. Our aim was to test if co-administering psyllium with inulin would reduce gas... Read More about Psyllium reduces insulin-induced colonic gas production in irritable bowel syndrome: MRI and in vitro fermentation studies.

Postprandial changes in gastrointestinal function and transit in cystic fibrosis assessed by Magnetic Resonance Imaging (2021)
Journal Article
Ng, C., Dellschaft, N. S., Hoad, C. L., Marciani, L., Ban, L., Prayle, A. P., Barr, H. L., Jaudszus, A., Mainz, J. G., Spiller, R., Gowland, P., Major, G., & Smyth, A. R. (2021). Postprandial changes in gastrointestinal function and transit in cystic fibrosis assessed by Magnetic Resonance Imaging. Journal of Cystic Fibrosis, 20(4), 591-597. https://doi.org/10.1016/j.jcf.2020.06.004

Background: Cystic fibrosis (CF) is a multi-system genetic disorder affecting >72,000 people worldwide. Most CF patients experience gastrointestinal symptoms and can develop complications. However, the mechanisms of CF gut disease are not well unders... Read More about Postprandial changes in gastrointestinal function and transit in cystic fibrosis assessed by Magnetic Resonance Imaging.

Colonic Volume Changes in Paediatric Constipation Compared to Normal Values Measured Using MRI (2021)
Journal Article
Sharif, H., Hoad, C. L., Abrehart, N., Gowland, P. A., Spiller, R. C., Kirkham, S., Loganathan, S., Papadopoulos, M., Benninga, M. A., Devadason, D., & Marciani, L. (2021). Colonic Volume Changes in Paediatric Constipation Compared to Normal Values Measured Using MRI. Diagnostics, 11(6), Article 974. https://doi.org/10.3390/diagnostics11060974

Background: Functional constipation in children is common. Management of this condition can be challenging and is often based on symptom reports. Increased, objective knowledge of colonic volume changes in constipation compared to health could provid... Read More about Colonic Volume Changes in Paediatric Constipation Compared to Normal Values Measured Using MRI.

Magnetic resonance imaging of the gastrointestinal tract shows reduced small bowel motility and altered chyme in cystic fibrosis compared to controls (2021)
Preprint / Working Paper
Dellschaft, N. S., Ng, C., Hoad, C., Marciani, L., Spiller, R., Stewart, I., Menys, A., Barr, H., Gowland, P. A., Major, G., & Smyth, A. R. Magnetic resonance imaging of the gastrointestinal tract shows reduced small bowel motility and altered chyme in cystic fibrosis compared to controls

Cystic fibrosis (CF) is a genetic disease affecting mucosal secretions. Most patients experience digestive symptoms, but the mechanisms are incompletely understood. Here we explore causes and consequences of slower gastrointestinal transit using magn... Read More about Magnetic resonance imaging of the gastrointestinal tract shows reduced small bowel motility and altered chyme in cystic fibrosis compared to controls.

MR Measures of Small Bowel Wall T2 Are Associated With Increased Permeability (2020)
Journal Article
Scott, R. A., Williams, H. G., Hoad, C. L., Alyami, A., Ortori, C. A., Grove, J. I., Marciani, L., Moran, G. W., Spiller, R. C., Menys, A., Aithal, G. P., & Gowland, P. A. (2021). MR Measures of Small Bowel Wall T2 Are Associated With Increased Permeability. Journal of Magnetic Resonance Imaging, 53(5), 1422-1431. https://doi.org/10.1002/jmri.27463

Background: Increased small bowel permeability leads to bacterial translocation, associated with significant morbidity and mortality. Biomarkers are needed to evaluate these changes in vivo, stratify an individual's risk, and evaluate the efficacy of... Read More about MR Measures of Small Bowel Wall T2 Are Associated With Increased Permeability.

Measurement of fasted state gastric antral motility before and after a standard bioavailability and bioequivalence 240 mL drink of water: Validation of MRI method against concomitant perfused manometry in healthy participants (2020)
Journal Article
Heissam, K., Abrehart, N., Hoad, C. L., Wright, J., Menys, A., Murray, K., Glover, P. M., Hebbard, G., Gowland, P. A., Baker, J., Hasler, W. L., Spiller, R. C., Corsetti, M., Brasseur, J. G., Hens, B., Shedden, K., Dickens, J., Mudie, D. M., Amidon, G. E., Amidon, G. L., & Marciani, L. (2020). Measurement of fasted state gastric antral motility before and after a standard bioavailability and bioequivalence 240 mL drink of water: Validation of MRI method against concomitant perfused manometry in healthy participants. PLoS ONE, 15(11), e0241441. https://doi.org/10.1371/journal.pone.0241441

Objective The gastrointestinal environment in which drug products need to disintegrate before the drug can dissolve and be absorbed has not been studied in detail due to limitations, especially invasiveness of existing techniques. Minimal in vivo dat... Read More about Measurement of fasted state gastric antral motility before and after a standard bioavailability and bioequivalence 240 mL drink of water: Validation of MRI method against concomitant perfused manometry in healthy participants.

Feasibility Study of a New MRI Mini-Capsule Device to Measure Whole Gut Transit Time in Pediatric Constipation (2020)
Journal Article
Sharif, H., Abrehart, N., Hoad, C., Murray, K., Perkins, A., Smith, M., Gowland, P., Spiller, R., Harris, R., Kirkham, S., Loganathan, S., Papadopoulos, M., Frost, K., Young Persons Advisory Group, Devadason, D., & Marciani, L. (2020). Feasibility Study of a New MRI Mini-Capsule Device to Measure Whole Gut Transit Time in Pediatric Constipation. Journal of Pediatric Gastroenterology and Nutrition, 71(5), 604-611. https://doi.org/10.1097/MPG.0000000000002910

Objective: In England, 27,500 children are referred annually to hospital with constipation. An objective measure of whole gut transit time (WGTT) could aid management. The current standard WGTT assessment, the X-ray radiopaque marker (ROM) test, give... Read More about Feasibility Study of a New MRI Mini-Capsule Device to Measure Whole Gut Transit Time in Pediatric Constipation.

Processing Apples to Puree or Juice Speeds Gastric Emptying and Reduces Postprandial Intestinal Volumes and Satiety in Healthy Adults (2020)
Journal Article
Krishnasamy, S., Lomer, M. C. E., Marciani, L., Hoad, C. L., Pritchard, S. E., Paul, J., Gowland, P. A., & Spiller, R. C. (2020). Processing Apples to Puree or Juice Speeds Gastric Emptying and Reduces Postprandial Intestinal Volumes and Satiety in Healthy Adults. Journal of Nutrition, 150(11), 2890-2899. https://doi.org/10.1093/jn/nxaa191

Background: Whole apples produce greater satiety than processed apples, but the underlying mechanisms remain unclear.
Objective: Our aim was to assess the intragastric processing of apple preparations and the associated small and large bowel conten... Read More about Processing Apples to Puree or Juice Speeds Gastric Emptying and Reduces Postprandial Intestinal Volumes and Satiety in Healthy Adults.

The MRI colonic function test: Reproducibility of the Macrogol stimulus challenge (2020)
Journal Article
Wilkinson-Smith, V., Menys, A., Bradley, C., Corsetti, M., Marciani, L., Atkinson, D., Coupland, C., Taylor, S., Gowland, P., Spiller, R., & Hoad, C. (2020). The MRI colonic function test: Reproducibility of the Macrogol stimulus challenge. Neurogastroenterology and Motility, 32(11), Article e13942. https://doi.org/10.1111/nmo.13942

Background

Magnetic resonance imaging (MRI) of the colonic response to a macrogol challenge drink can be used to assess the mechanisms underlying severe constipation. We measured the intra-subject reproducibility of MRI measures of colonic funct... Read More about The MRI colonic function test: Reproducibility of the Macrogol stimulus challenge.