Bone Marrow Conversion and Reconversion

2019 ◽  
pp. 28-32
Author(s):  
Kevin B. Hoover
Keyword(s):  
Bone Marrow ◽  
The Body ◽  
Imaging Characteristics ◽  
Underlying Disorder ◽  
Marrow Conversion ◽  
Hematopoietic Bone Marrow

Chapter 75 discusses bone marrow conversion and reconversion. The bone marrow is one of the largest organs in the body and it changes in composition throughout life. There is a normal conversion of hematopoietic bone marrow to fatty marrow with age. Various stressors or diseases can cause a reversal of this process or marrow reconversion. Marrow reconversion is often incidentally detected on MRI. Its imaging characteristics are important to distinguish from pathologic marrow infiltrative processes. Characteristic locations of marrow reconversion and the presence of focal or microscopic fat on MRI are useful features, but biopsy may still be required to exclude malignancy. Treatment is specific to the underlying disorder.

scholarly journals Radiation Protection in Pediatric Radiology

JMS SKIMS ◽  
2016 ◽  
Vol 19 (1) ◽  
pp. 39-40
Author(s):  
Azhar M Khan ◽  
Tahleel A Shera ◽  
Naseer A Choh ◽  
Gh Mohammad Wani ◽  
Zubair Ahmad
Keyword(s):  
Bone Marrow ◽  
Cell Division ◽  
Pediatric Radiology ◽  
Radiation Risk ◽  
The Body ◽  
Division Rate ◽  
Cell Division Rate ◽  
Radiation Induced ◽  
Malignant Lesions ◽  
Hematopoietic Bone Marrow

The radiation risk is higher for children than for adults, as children's tissues have a higher cell division rate, and cells can be damaged during this process. Children's bodies also have a higher water content and therefore absorb more radiation, which can cause damage to their genes. There are radiation, which can cause damage to their genes. There are also differences in the location of particularly at-risk tissues such as hematopoietic bone marrow. In adults, 74% (spine ribs, pelvis) is located in the skeleton or the trunk, and only 9% in the extremities. In infants, 29% is located in the skeleton of the trunk and 35% in the extremities.In adults, 8% is located in the cranial bones; in infants, 27%. This means that infants have large proportions of hematopoietic bone marrow in all parts of the body, including the extremities and any radiograph irradiates a substantial proportion of the hematopoietic marrow. As radiation induced malignant lesions remain latent for years, children and adolescents are prone to experience them. JMS 2016; 19(1):39-40

scholarly journals Polymer-Drug Conjugates as Nanotheranostic Agents

2021 ◽  
Vol 2 (1) ◽  
pp. 63-81
Author(s):  
Sajana Manandhar ◽  
Erica Sjöholm ◽  
Johan Bobacka ◽  
Jessica M. Rosenholm ◽  
Kuldeep K. Bansal
Keyword(s):  
Drug Delivery ◽  
Drug Release ◽  
Treatment Options ◽  
The Body ◽  
Drug Conjugates ◽  
Imaging Characteristics ◽  
Wide Range ◽  
Systemic Side Effects ◽  
Theranostic Agents ◽  
The Stability

Since the last decade, the polymer-drug conjugate (PDC) approach has emerged as one of the most promising drug-delivery technologies owing to several benefits like circumventing premature drug release, offering controlled and targeted drug delivery, improving the stability, safety, and kinetics of conjugated drugs, and so forth. In recent years, PDC technology has advanced with the objective to further enhance the treatment outcomes by integrating nanotechnology and multifunctional characteristics into these systems. One such development is the ability of PDCs to act as theranostic agents, permitting simultaneous diagnosis and treatment options. Theranostic nanocarriers offer the opportunity to track the distribution of PDCs within the body and help to localize the diseased site. This characteristic is of particular interest, especially among those therapeutic approaches where external stimuli are supposed to be applied for abrupt drug release at the target site for localized delivery to avoid systemic side effects (e.g., Visudyne®). Thus, with the help of this review article, we are presenting the most recent updates in the domain of PDCs as nanotheranostic agents. Different methodologies utilized to design PDCs along with imaging characteristics and their applicability in a wide range of diseases, have been summarized in this article.

Hematological and toxicological evaluation of formaldehyde as a potential cause of human leukemia

2010 ◽  
Vol 30 (7) ◽  
pp. 725-735 ◽  
Author(s):  
Bernard D Goldstein
Keyword(s):  
Bone Marrow ◽  
Chromosomal Abnormalities ◽  
Species Difference ◽  
The Body ◽  
Myelogenous Leukemia ◽  
Laboratory Animals ◽  
Human Leukemia ◽  
Toxicological Evaluation ◽  
Hematopoietic Stem ◽  
Hematological Cancers

Epidemiological findings suggesting that formaldehyde exposure is associated with a higher risk of acute myelogenous leukemia (AML) and other hematological cancers have led to consideration of the potential mechanism of action by which inhalation of this rapidly reactive agent can cause bone marrow cancer. Two major mechanism-based arguments against formaldehyde as a leukemogen have been the difficulty in envisioning how inhaled formaldehyde might penetrate to the bone marrow; and the lack of similarity of non-cancer effects to other known human myeloleukemogens, particularly the absence of pancytopenia in humans or laboratory animals exposed to high levels. However, both of these arguments have been addressed by the recent finding of a pancytopenic effect and chromosomal abnormalities in heavily exposed Chinese workers which, if replicated, are indicative of a genotoxic effect of formaldehyde on hematopoietic stem cells that is in keeping with other known human leukemogens. Review of the body of evidence suggests an apparent discrepancy between studies in laboratory animals, which generally fail to show evidence of penetration of formaldehyde into the blood or evidence of blood or bone marrow genotoxicity, and studies of exposed humans in which there tends to be evidence of genotoxicity in circulating blood cells. One possible explanation for this discrepancy is species difference. Another possible explanation is that myeloid precursors within the nasal mucosa may be the site for leukemogenesis. However, chloromas, which are local collections of myeloid tumor cells, are rarely if ever found in the nose. Other proposed mechanisms for formaldehyde leukemogenesis are reviewed, and dose issues at the interface between the epidemiological and hematotoxicological findings are explored.

scholarly journals FDG-PET vs. chemical shift MR imaging in differentiating intertrabecular metastasis from hematopoietic bone marrow hyperplasia

2021 ◽  
Author(s):  
Nozomi Oki ◽  
Yohei Ikebe ◽  
Hirofumi Koike ◽  
Reiko Ideguchi ◽  
Daisuke Niino ◽  
...  
Keyword(s):  
Bone Marrow ◽  
Chemical Shift ◽  
Fdg Pet ◽  
Standardized Uptake Value ◽  
Roc Curve Analysis ◽  
Cutoff Value ◽  
Significant Difference ◽  
Histopathological Studies ◽  
Fdg Pet Ct ◽  
Hematopoietic Bone Marrow

Abstract Purpose To evaluate the utility of SUVmax on FDG-PET and chemical shift imaging (CSI) on MRI in the differentiation of intertrabecular metastasis (ITM) from hematopoietic bone marrow hyperplasia (HBMH). Patients and methods We retrospectively evaluated 54 indeterminate focal bone marrow lesions in 44 patients detected on FDG-PET. The lesions were assigned to the metastasis group (M group, 29 lesions of 24 patients) and the non-metastasis group (non-M group, 25 lesions of 20 patients) based on the follow-up or the histopathological studies. The lesions were assessed with the maximum standardized uptake value (SUVmax) on FDG-PET CT images and signal change ratio (SCR) on CSI. Results The median SUVmax were 5.62 and 2.91; the median SCR were − 0.08 and − 34.8 in M and non-M groups respectively, with significant difference (p < 0.001). With ROC curve analysis, the optimal cutoff value of SUVmax was 4.48 with a sensitivity of 72.4%, a specificity of 100%, and AUC of 0.905. The cutoff value of SCR was − 6.15 with a sensitivity of 82.8%, a specificity of 80%, and AUC of 0.818. Conclusion FDG-PET and CSI on MRI are useful in distinguishing ITM from HBMH. Though their sensitivities are similar, the specificity of FDG-PET was higher than that of MRI.

scholarly journals The Evolution in The Treatment of Multiple Myeloma Towards Targeted Magnetic Molecularly Imprinted Nanomedicines

2015 ◽  
pp. 1-2
Author(s):  
Edgar Pérez-Herrero
Keyword(s):  
Multiple Myeloma ◽  
Bone Marrow ◽  
Bacterial Infections ◽  
Plasma Cells ◽  
The Body ◽  
Western World ◽  
Bone Lesions ◽  
Non Hodgkin Lymphoma ◽  
Clonal Proliferation ◽  
Tract Infections

Multiple myeloma is the second more frequently haematological cancer in the western world, after non-Hodgkin lymphoma, being about the 1-2 % of all the cancers cases and the 10-13% of hematologic diseases. The disease is caused by an uncontrolled clonal proliferation of plasma cells in the bone marrow that accumulate in different parts of the body, usually in the bone marrow, around some bones, and rarely in other tissues, forming tumor deposits, called plasmocytomas. This uncontrolled clonal proliferation of plasma cells produces the secretion of an abnormal monoclonal immunoglobulin (paraprotein or M-protein) and prevents the formation of the other antibodies produced by the normal plasma cells that are destroyed. The anormal secretion of paraproteins unbalance the osteoblastosis and osteoclastosis processes, leading to bone lesions that cause lytic bone deposits and the release of calcium from bones (hypercalcemia) that may produce renal failure. Regions affected by bone lesions are the skull, spine, ribs, sternum, pelvis and bones that form part of the shoulders and hips. The substitution of the healthy bone marrow by infiltrating malignant cells and the inhibition of the normal production of red blood cells produce anaemia, thrombocytopenia and leukopenia. Multiple myeloma patients are immunosuppressed because of leukopenia and the abnormal immunoglobulin production caused by the uncontrolled clonal proliferation of plasma cells, being susceptible to bacterial infections, like pneumonias and urinary tract infections. The interaction of immunoglobulin with hemostatic mechanisms may lead to haemorrhagic diathesis or thrombosis. Also, disorders of the central and peripheral nervous system are part of the disease, being the more common neurological manifestations the spinal cord compressions and the peripheral neuropathies.

scholarly journals Co-Therapy of Pegylated G-CSF and Ghrelin for Enhancing Survival After Exposure to Lethal Radiation

2021 ◽  
Vol 12 ◽  
Author(s):  
Juliann G. Kiang ◽  
Min Zhai ◽  
Bin Lin ◽  
Joan T. Smith ◽  
Marsha N. Anderson ◽  
...  
Keyword(s):  
Bone Marrow ◽  
Body Weight ◽  
Water Consumption ◽  
Bone Marrow Cells ◽  
The Body ◽  
Photon Radiation ◽  
Vehicle Group ◽  
Spleen Weight ◽  
Histopathological Analysis ◽  
Marrow Cells

Exposure to ionizing radiation (radiation injury, RI) in nuclear-related episode is evident to be life-threatening. RI occurs at levels of organs, tissues, cytosols, or nucleus. Their mechanisms are still not fully understood. FDA approves pegylated granulocyte colony-stimulating factor (Neulasta™, Peg-G-CSF) for acute hematopoietic syndrome and has been shown to save lives after lethal RI. We aimed to test whether Ghrelin enhanced Peg-G-CSF’s efficacy to save more lives after lethal RI. B6D2F1/J female mice were used for the study. They received 9.5 Gy (LD50/30 at 0.4 Gy/min) emitted from the 60Co-γ-photon radiation facility. Peg-G-CSF was injected subcutaneously at 1 mg/kg once on days 1, 8, and 15 after irradiation. Ghrelin contains 28 amino acid and is a hunger peptide that has been shown to stimulate food intake, promote intestinal epithelial cell proliferation, elevates immunity, inhibits brain hemorrhage, and increases stress-coping. Ghrelin was injected subcutaneously at 113 μg/kg once on days 1, 2, and 3 after irradiation. Survival, body weight, water consumption, hematology, spleen weight, splenocytes, bone marrow cells, and histology of bone marrow and ileum were performed. We observed that radiation resulted in 30-days survival by 30%. RI decreased their body weights and water consumption volumes. On the 30th day post-RI, platelets and WBCs such as basophils, eosinophils, monocytes, lymphocytes, neutrophils and leukocytes were still significantly decreased in surviving mice. Likewise, their RBC, hemoglobin, hematocrit, and splenocytes remained low; splenomegaly was found in these mice. Bone marrow in surviving RI animals maintained low cellularity with high counts of fat cells and low counts of megakaryocytes. Meanwhile, ileum histology displayed injury. However, mice co-treated with both drugs 24 h after RI resulted in 30-days survival by 45% above the vehicle group. Additionally, the body-weight loss was mitigated, the acute radiation syndrome was reduced. This co-therapy significantly increased neutrophils, eosinophils, leukocytes, and platelets in circulation, inhibited splenomegaly, and increased bone marrow cells. Histopathological analysis showed significant improvement on bone marrow cellularity and ileum morphology. In conclusion, the results provide a proof of concept and suggest that the co-therapy of Peg-G-CSF and Ghrelin is efficacious to ameliorate RI.

scholarly journals STUDY OF ANTIGENOTOXIC POTENTIAL OF THE ROSEHIP (ROSA MAJALIS HERRM.) OF THE FAMILY ROSACEAE

REPORTS ◽  
2021 ◽  
Vol 2 (336) ◽  
pp. 54-60
Author(s):  
Zh. A. Zhonderbek ◽  
S. Zh. Kolumbayeva ◽  
A. V. Lovinskaya ◽  
N. Voronova
Keyword(s):  
Bone Marrow ◽  
Adverse Effects ◽  
Environmental Pollutants ◽  
The Body ◽  
Laboratory Animals ◽  
Laboratory Mice ◽  
Herbal Tea ◽  
The Family ◽  
Induced Mutagenesis ◽  
Combined Action

Increasing the body's resistance to various environmental pollutants' adverse effects is one of medicine's essential tasks. In this regard, an active search for antimutagens to eliminate or weaken mutagens' effect in the body is currently underway. One of the promising sources of antimutagenic compounds is the medicinal plant Rosa majalis Herrm (rosehips). The genotoxic and antigenotoxic activity of rosehips was studied on cells of bone marrow, spleen, liver, and kidneys of laboratory mice using an alkaline variant Comet assay. It was found that rosehip infusions in various concentrations (infusion, diluted infusion and herbal tea) do not have a genotoxic effect on the cells of the studied organs of laboratory animals. The medicinal rosehip's combined action with classical mutagen MMS significantly reduced (p<0.01) MMS-induced mutagenesis level. The various rosehip infusions used did not show statistically significant differences among themselves. The results obtained indicate the antigenotoxic activity of R. majalis infusions.

scholarly journals Comparative Study of Effect of Silver Nitrate Gel and Differentiated Dermal Precursors (BMSCs) on Third Degree Burn in Wistar Rats

2020 ◽  
Vol 11 (1) ◽  
pp. 200-206
Author(s):  
Balaji K ◽  
Perumal Saraswathi ◽  
Prabhu K ◽  
Shila Samuel ◽  
Melani Rajendren ◽  
...  
Keyword(s):  
Bone Marrow ◽  
Silver Nitrate ◽  
Wistar Rats ◽  
Burn Injury ◽  
Wistar Rat ◽  
Metal Plate ◽  
Healing Time ◽  
The Body ◽  
Burn Wound ◽  
Healing Wound

Skin is an ectodermal derivative that maintains internal homeostasis of the body. Any damage to the skin like burn injury internal homeostasis is lost, resulting in delayed healing. The aim is to study the histoarchitecture comparative effect of silver nitrate gel, and BMSCs (DDP) on third-degree burns in Wistar rats. A burn wound of size 2.5 cm (length) x 2.5 cm (breadth) x 6 mm (depth) was created using a preheated metal plate on flanks of Wistar rat. Every burn wound was treated with silver nitrate gel (commercially available as silverex), bone marrow differentiated dermal precursors, and monitored for 1, 7, 14, 21 days until wound healing. Wound surface area was measured and compared among groups with histological and gross observations. The healing time was faster in bone marrow differentiated dermal precursors (DDP) group compared to control. Prolonged silver nitrate gel usage heals burn wound with no infection, but silver toxicity was noted. Wound contraction is slower but steady using bone marrow differentiated dermal precursors (DDP) cell when compared to the group treated with silver nitrate gel. The data from this study help use to use bone marrow differentiated dermal precursors (DDP) cells as an alternate and effective way to treat burn wounds.

The Effects of Yerba Maté (Ilex Paraguariensis) Consumption on IL-1, IL-6, TNF-α and IL-10 Production by Bone Marrow Cells in Wistar Rats fed a High-Fat Diet

2013 ◽  
Vol 83 (1) ◽  
pp. 26-35 ◽  
Author(s):  
Luciana Simão Carmo ◽  
Marcelo Macedo Rogero ◽  
Mayara Cortez ◽  
Monica Yamada ◽  
Patrícia Silva Jacob ◽  
...  
Keyword(s):  
Bone Marrow ◽  
High Fat Diet ◽  
Wistar Rats ◽  
Bone Marrow Cells ◽  
The Body ◽  
Ilex Paraguariensis ◽  
Yerba Mate ◽  
High Fat ◽  
Tnf Α ◽  
Marrow Cells

An excessive consumption of a high-fat diet (HFD) results in becoming overweight or obese, which triggers a chronic inflammatory condition that is associated with a high white blood cell count. Because of the potential for yerba maté (Ilex paraguariensis) (YM) to impact obesity, this study aimed to investigate the effects of YM consumption on the hematological response and on the production of interleukin (IL)-1α, IL-6, tumor necrosis factor (TNF)-α, and IL-10 by bone marrow cells from Wistar rats fed a HFD. Male Wistar rats were fed a control (CON) or HFD diet for twelve weeks. At the end of this period, the rats received YM (1 g/kg/day body weight) for 4 weeks. After euthanasia, hemograms and myelograms were evaluated, while the bone marrow cells were cultured in the presence or absence of lipopolysaccharide (LPS) to evaluate the production of IL-1α, IL-6, TNF-α, and IL-10. The consumption of YM reduced the body weight, the body adiposity, and the cholesterol levels in HFD-fed rats. Bone marrow cells from the HFD group produced more IL-1α, IL-6, and TNF-α, and less IL-10, when compared to cells from the control group, and YM consumption reduced the IL-1α, IL-6, and TNF-α production by the cells. However, cells from the HFD rats that were stimulated with LPS increased their IL-1α, IL-6, and TNF-α production, but YM consumption did not change this result. In summary, the consumption of YM affects the production of IL-1α, IL-6, and TNF-α by bone marrow cells, promotes weight loss, decreases the number of white blood cells, and significantly improves serum cholesterol level in HFD-fed rats. However, the bone marrow cells from the HFD+YM-fed rats challenged with LPS did not show improvement in the inflammatory response compared to the cells from animals fed only a HFD that were also challenged with LPS.

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