Cell-derived nanovesicles from mesenchymal stem cells as extracellular vesicle-mimetics in wound healing

Wound healing is a dynamic process that involves a series of molecular and cellular events aimed at replacing devitalized and missing cellular components and/or tissue layers. Recently, extracellular vesicles (EVs), naturally cell-secreted lipid membrane-bound vesicles laden with biological cargos including proteins, lipids, and nucleic acids, have drawn wide attention due to their ability to promote wound healing and tissue regeneration. However, current exploitation of EVs as therapeutic agents is limited by their low isolation yields and tedious isolation processes. To circumvent these challenges, bioinspired cell-derived nanovesicles (CDNs) that mimic EVs were obtained by shearing mesenchymal stem cells (MSCs) through membranes with different pore sizes. Physical characterisations and high-throughput proteomics confirmed that MSC-CDNs mimicked MSC-EVs. Moreover, these MSC-CDNs were efficiently uptaken by human dermal fibroblasts and demonstrated a dose-dependent activation of MAPK signalling pathway, resulting in enhancement of cell proliferation, cell migration, secretion of growth factors and extracellular matrix proteins, which all promoted tissue regeneration. Of note, MSC-CDNs enhanced angiogenesis in human dermal microvascular endothelial cells in a 3D PEG-fibrin scaffold and animal model, accelerating wound healing in vitro and in vivo. These findings suggest that MSC-CDNs could replace both whole cells and EVs in promoting wound healing and tissue regeneration.

Malignant chondroid syringoma: An unusual scalp tumor

Chondroid syringomas are similar to mixed parotid tumors and present in both benign and malignant forms. Malignant chondroid syringoma (MCS) is a rare skin tumor that has a predilection for extremities, particularly in young women. It is even rarer to present as a scalp tumor with very few reported cases in the literature. We present a middle-aged woman, with a history of increasing fatigability of her right arm for the past 3 months who, on examination, was found to have scalp swelling and matted right posterior triangle lymph nodes. The working diagnosis on her was a large sebaceous cyst with secondary in the neck from an occult primary/non-Hodgkin抯 lymphoma. Preliminary fine-needle aspiration was inconclusive. Imaging followed by wide excision of the tumor and the nearby occipital node was done. The final histopathological diagnosis was MCS with secondary in the lymph node. These tumors are aggressive and metastasize early. Radical surgery is the only hope of cure as adjuvant treatment is yet to be standardized

Coronavirus Disease 2019 (COVID-19) Vaccination for Children: Position Statement of Indian Academy of Pediatrics Advisory Committee on Vaccination and Immunization Practices

Justification: Data generated after the first wave has revealed that some children with coronavirus 19 (COVID-19) can become seriously ill. Multi-inflammatory syndrome in children (MIS-C) and long COVID cause significant morbidity in children. Prolonged school closures and quarantine have played havoc with the psychosocial health of children. Many countries in the world have issued emergency use authorisation (EUA) of selected COVID-19 vaccines for use in children. In India, a Subject Expert Committee (SEC) has recommended the use of Covaxin (Bharat Biotech) for children from the ages of 2-18 years. The recommendation has been given to the Drugs Controller General of India (DCGI) for final approval. Objective: To provide an evidence-based document to guide the pediatricians on the recommendation to administer COVID vaccines to children, as and when they are available for use. Process: Formulation of key questions was done by the committee, followed by review of literature on epidemiology and burden of COVID-19 in children, review of the studies on COVID vaccines in children, and the IAP stand on COVID-19 vaccination in children. The available data was discussed in the ACVIP focused WhatsApp group followed by an online meeting on 24 October, 2021, wherein the document was discussed in detail and finalized. Recommendations: The IAP supports the Government of India’s decision to extend the COVID-19 vaccination program to children between 2-18 years of age. Children with high-risk conditions may be immunized on a priority basis. The IAP and its members should be a partner with the Government of India, in the implementation of this program and the surveillance that is necessary following the roll-out.

Indian Academy of Pediatrics (IAP) Advisory Committee on Vaccines and Immunization Practices (ACVIP) Recommended Immunization Schedule (2018-19) and Update on Immunization for Children Aged 0 Through 18 Years

Justification: There is a need to revise/review recommendations regarding existing vaccines in view of current developments invaccinology. Process: Advisory Committee on Vaccines and Immunization Practices (ACVIP) of Indian Academy of Pediatrics (IAP)reviewed the new evidence, had two meetings, and representatives of few vaccine manufacturers also presented their data. Therecommendations were finalized unanimously. Objectives: To revise and review the IAP recommendations for 2018-19 and issuerecommendations on existing and certain new vaccines. Recommendations. The major changes in the IAP 2018-19 ImmunizationTimetable include administration of hepatitis B vaccine within 24 hours of age, acceptance of four doses of hepatitis B vaccine if acombination pentavalent or hexavalent vaccine is used, administration of DTwP or DTaP in the primary series, and complete replacementof oral polio vaccine (OPV) by injectable polio vaccine (IPV) as early as possible. In case IPV is not available or feasible, the child shouldbe offered three doses of bivalent OPV. In such cases, the child should be advised to receive two fractional doses of IPV at aGovernment facility at 6 and 14 weeks or at least one dose of intramuscular IPV, either standalone or as a combination, at 14 weeks. Thefirst dose of monovalent Rotavirus vaccine (RV1) can be administered at 6 weeks and the second at 10 weeks of age in a two-doseschedule. Any of the available rotavirus vaccine may be administered. Inactivated influenza vaccine (either trivalent or quadrivalent) isrecommended annually to all children between 6 months to 5 years of age. Measles-containing vaccine (MMR/MR) should beadministered after 9 months of age. Additional dose of MR vaccine may be administered during MR campaign for children 9 months to 15years, irrespective of previous vaccination status. Single dose of Typhoid conjugate vaccine (TCV) is recommended from the age of 6months and beyond, and can be administered with MMR vaccine if administered at 9 months. Four-dose schedule of anti-rabies vaccinefor Post Exposure Prophylaxis as recommended by World Health Organization in 2018, is endorsed, and monoclonal rabies antibody canbe administered as an alternative to Rabies immunoglobulin for post-exposure prophylaxis.

Determinants of Nutritional Anemia in Adolescents.

Objectives: To associate the severity of nutritional anaemia with serum levels of ferritin, vitamin B12 and folate; and to determine demographic, socio-economic and nutritional correlates for nutritional anemia in adolescents. Methods: Cross-sectional hospital-based study among 200 adolescents (10-18 y) with anemia. Dietary intake (24-h recall), and serum levels of folate, vitamin B12 and ferritin were estimated. Results: Iron, folate and vitamin B12 deficiency was present in 30.5% 79.5% and 50% of adolescents, respectively. Statistically significant association was observed between severity of anemia and serum vitamin B12 levels, iron intake, folate intake, Vitamin B12 intake, vegetarian diet, attainment of menarche and history of worm infestation. Conclusions: Folate and vitamin B12 deficiencies are more common than iron deficiency in anemic adolescents. Low dietary intake of these nutrients seems to be a significant determinant of their deficiencies.

Bleeding duodenal lipoma treated with endoscopic polypectomy.

Duodenal lipomas are relatively uncommon and are rarely a source of severe upper gastrointestinal haemorrhage. We report the case of a 70-year-old woman who presented with significant upper GI bleed due to a large bleeding duodenal lipoma that was successfully treated by endoscopic polypectomy.

Embryonal rhabdomyosarcoma of the chest wall: a case report and review of the literature.

Embryonal rhabdomyosarcoma is a soft-tissue sarcoma which has a predilection for the head and neck area, genitourinary tract and the extremities. We report a rare case of embryonal rhabdomyosarcoma of the chest wall in an 8-year-old girl, presenting as a destructive tumor in the rib and clinically and radiologically mimicking Ewing's sarcoma. Histopathological examination showed a small round cell tumor. Immunohistochemically, the positivity for muscle markers desmin and myogenin in the tumor cells proved to be useful for making a definitive diagnosis of embryonal rhabdomyosarcoma. Cytogenetic analysis revealed a high level of aneuploidy in the tumor cells, with double-minutes and additional chromosomal structural aberrations. The patient is responding well to chemotherapy.

Selective amyloidosis of the small intestine presenting as malabsorption syndrome.

Amyloidosis is a unique metabolic storage disease that affects the gastrointestinal tract but rarely causes severe symptoms. We describe the case of a 51-year-old woman presenting with chronic small bowel diarrhoea and malabsorption. Barium contrast studies and enteroscopy revealed a coarse mucosal pattern and thickening of the jejunal and proximal ileal folds. Histological examination revealed massive deposits of amyloid in thejejunal wall. No predisposing factor was found and there were no other sites of deposition. This is a rare case report of primary selective small intestinal amyloidosis manifesting as the malabsorption syndrome.

Primary oesophageal tuberculosis: a rare entity.

Tuberculous infection of the oesophagus is rare and primary oesophageal tuberculosis is seen even more infrequently. We report a case of oesophageal tuberculosis in a 32-year-old female patient who presented to us with odynophagia and weight loss. Endoscopy showed a solitary ulcerative oesophageal lesion. Further investigation resulted in a diagnosis of oesophageal tuberculosis with no manifestations of tuberculosis elsewhere. She responded well to antitubercular treatment. This case was classified as primary oesophageal tuberculosis.

Profile of colonic polyps in a southern Indian population.

BACKGROUND: In Western countries, colonic polyps are usually adenomatous in nature, are evenly distributed along the entire colon in asymptomatic per-sons and show a left-sided predominance in symptomatic patients. There is dearth of such literature from India. METHODS: We retrospectively analyzed reports of colonoscopies done in our institution during the period 2001 to 2005. Clinical features, colonoscopic description and histologic findings of all patients with polyps were noted. Association of the degree of dysplasia with the size, site and type of polyps and the person's age was assessed. RESULTS: Polyps were seen in 124 (5.1%) of 2412 complete colonoscopies. Mean age of patients with polyps was 58.1 (SD 19.9) years; ninety were men. A majority of polyps (92%) were located in the left colon. They were adenomatous in 99 (79.8%), juvenile in 12 (9.8%), hyperplastic in 11 (8.8 %), inflammatory in 1 (0.8%) and Peutz-Jegher's polyp in 1 (0.8%). Dysplasia was severe in large (>2 cm) polyps compared to small (< 1 cm) ones (p< 0.001). Age of patient and location of polyp had no association with degree of dysplasia. CONCLUSIONS: In southern Indian adults, most colonic polyps are adenomatous and are in the left colon. Large polyps are associated with severe dysplasia.

Endoscopic abnormalities in the oesophagus after variceal sclerotherapy--a long-term follow up study.

Endoscopic sclerotherapy is a well-established treatment modality for oesophageal varices. Various local, regional and systemic complications occur after sclerotherapy. Altered endoscopic appearances of the oesophagus have been observed on follow-up of patients after sclerotherapy. 171 consecutive patients with extra-hepatic portal venous obstruction on follow up after achieving variceal eradication by sclerotherapy during the period from January 2004 to June 2005 were enrolled in this study. The oesophagus was closely observed for mucosal abnormalities and the endoscopic findings were recorded. Out of 171 patients, 95 (55.5%) patients had no specific endoscopic changes in the oesophagus. The most common finding was mucosal neovascularization which was seen in 56 (32.7%) patients. Oval or oblong depressed areas were seen in 41 (23.9%) patients. Mucosal tags and polypoidal lesions were seen in 37 (21.6%) patients. 25 (15.6%) patients had stenosis of the lower oesophagus and 3 (1.7%) patients had mucosal bridges. On multivariate analysis, these abnormal endoscopic findings in the oesophagus correlated with the total volume of sclerosant injected when compared with those patients without similar findings on endoscopy (p value < 0.001). Endoscopic sclerotherapy leads to various abnormalities at the injection sites like neovascularization, oval or oblong depressed areas, mucosal tags, polypoidal lesions, stenosis and mucosal bridges. Endoscopic abnormalities correlated with the total volume of sclerosant used. The long-term significance of these changes is not known at present and further follow-up studies will be required.

Infected pseudocyst in tropical pancreatitis presenting as psoas abscess.

Infected pseudocyst as a consequence of tropical pancreatitis presenting as psoas abscess is unusual. We report a 40-year-old man who presented with pain in the right lumbar region. CT and MRI of the abdomen revealed pancreatic pseudocysts with abscess formation in the psoas muscle and evidence of chronic calcific pancreatitis. He was managed by percutaneous drainage of the abscess along with antibiotics and other supportive measures.

Colitis due to Ancylostoma duodenale.

The larva of hookworm matures into the adult stage in the small intestine, causing chronic intestinal blood loss and iron-deficiency anemia. Hookworm infestation of colon has not been reported previously. We report a 35-year-old man who presented with diarrhea with blood and mucus in stools. Colonoscopy revealed several hookworms in the colon firmly adherent to the mucosa, with oozing of blood and surrounding mucosal erosions. He was treated with mebendazole and symptoms recovered completely.

Prevalence of Hepatitis B and C in the normal population and high risk groups in north Kerala.

BACKGROUND: Our aim is to assess the prevalence of Hepatitis B and Hepatitis C infections among normal healthy persons and high risk groups in the northern part of Kerala state in South India as there is insufficient published literature related to this subject. METHODS: HBsAg and AntiHCV screening were done in normal persons and in high risk groups. Normal persons screened included voluntary blood donors, those attending mandatory medical check up for jobs in middle east Asia and pregnant women. High risk groups were health care workers, intravenous drug abusers, commercial sex workers and male homosexuals. RESULTS: HBsAg and anti HCV antibody test results in the various groups were as follows. Voluntary blood donors--HBsAg was positive in 0.71 % and anti HCV was positive in 0.33%; job seekers to middle east Asia had 0.89% and 0.12% prevalence of HBV and HCV respectively. Among the pregnant women, 0.21% were HBsAg positive. Among the high risk groups, none of the health care workers were HbsAg positive and 0.79% were antiHCV positive. Among the IV drug abusers 2.7% were HBsAg positive and 51.89% were positive for antiHCV. In commercial sex workers, 3.47 % were HBsAg positive and 2.6 % were antiHCV positive. In male homosexuals, 4.49% were HBsAg positive and 3.37% were antiHCV positive. CONCLUSIONS: The prevalence of Hepatitis B and C in the normal population of Calicut in the northern part of Kerela is 0.52% and 0.24%. Compared to other areas of India, the seroprevalence of Hepatitis B and C are low in the normal population of Calicut. Among the high-risk groups, IV drug users have a high prevalence of AntiHCV.

Severe colitis induced by soap enemas.

Soap enemas causing severe colitis with stricture and complications have rarely been reported. We report three patients in whom soapsud enema caused severe colitis and complications like stricture requiring surgery.

Listening to music decreases need for sedative medication during colonoscopy: a randomized, controlled trial.

BACKGROUND: Music played during endoscopic procedures may alleviate anxiety and improve patient acceptance of the procedure. A prospective randomized, controlled trial was undertaken to determine whether music decreases the requirement for midazolam during colonoscopy and makes the procedure more comfortable and acceptable. METHODS: Patients undergoing elective colonoscopy between October 2003 and February 2004 were randomized to either not listen to music (Group 1; n=40) or listen to music of their choice (Group 2; n=38) during the procedure. All patients received intravenous midazolam on demand in aliquots of 2 mg each. The dose of midazolam, duration of procedure, recovery time, pain and discomfort scores and willingness to undergo a repeat procedure using the same sedation protocol were compared. RESULTS: Patients in Group 2 received significantly less midazolam than those in Group 1 (p=0.007). The pain score was similar in the two groups, whereas discomfort score was lower in Group 2 (p=0.001). Patients in the two groups were equally likely to be willing for a repeat procedure. CONCLUSION: Listening to music during colonoscopy helps reduce the dose of sedative medications and decreases discomfort experienced during the procedure.