Targeting tumor cells using magnetic nanoparticles - a feasibility study in animal models.

INTRODUCTION: In non-resectable tumors, chemotherapy is crucial to improve patient survival. However, it is often accompanied by considerable side effects. Targeted delivery of chemotherapy by coupling with iron oxide superparamagnetic nanoparticles (IONP) could potentially increase efficacy while decreasing adverse systemic side effects. We aimed to evaluate the feasibility of targeting nontoxic, biodegradable-IONP into tumors in-vivo by applying an external magnetic field. MATERIAL AND METHODS: Subcutaneous colon carcinoma tumors were induced in 35 mice. IONP was injected systemically, followed by suturing of a magnet on top of the tumors for 2-24 h. Tumors and livers were excised and stained for iron to explore IONP localization. RESULTS: Iron staining was evident in 43% and 20% of tumors exposed to magnets for 4 h or 24 h, respectively. No iron was present following 2 h exposure, nor in the control group; however, iron stain in the livers indicates most of the IONP were cleared by the liver 24 h later. CONCLUSION: We demonstrated the targeting feasibility of IONP to tumor tissue by an external magnetic field. Our data shows successful targeting; however, with low efficacy following systemic injection of the IONP. As such, a paradigm shift is strongly recommended from systemic to locoregional IONP injection to increase targeting efficacy.

Perinatal depression-knowledge gap among service providers and service utilizers in India.

INTRODUCTION: Lack of access to perinatal mental health (PMH) services is a significant public health problem in India. Barriers to accessing PMH services include the stigma, non-availability of services, poor knowledge, negative perception, attitude among perinatal women (PWs) and service providers. The present study attempted to examine the knowledge gap regarding perinatal depression (PD) among service providers [Nursing providers (NPs), Medical Practitioners (MPs)] and service utilizers (PWs). METHODS: This cross-sectional study was conducted in two tertiary care teaching hospitals of India, one in a major metro and the other in a rural area. PWs, MPs and NPs were assessed for knowledge about PD using a semi-structured proforma and Perinatal Depression Monitor. RESULTS: Among the 270 PWs, 8.51% were knowledgeable (PWA) and 91.49% were ignorant (PWB) about depression. PWB group were low educated (n = 140, 56.68%), and unemployed (n = 207, 83.80%) with lower family income [(≤₹10,356 per month), n = 170, 68.28%)]. There was knowledge discrepancy among NPs, MPs and PWA group in terms of a) PD is a normal part of pregnancy (agree- NPs = 71.52%, MPs = 10.00%, PWA-17.39%), b)biological causes of PD (agree- NPs = 45.23%, MPs = 70.00%, PWA = 26.03%) and c)antidepressant medications for PD (useful- NPs = 23.80%, MPs = 70.00%, PWA = 21.73%). Majority of the respondents agreed that all women should be screened for depression during pregnancy (NPs = 34.78%, MPs = 80.95%, PWA = 95.00%) and postpartum periods (NPs = 34.78%, MPs = 76.19%, PWA = 90.00%). CONCLUSIONS: Low PD literacy among the PWs, misconception about aetiology and management among the NPs could be major barrier for delivery and utilisation of PD services. Thus, there is an urgent need to improve PD literacy among PWs and NPs.