A genetically encoded fluorescent biosensor for extracellular l-lactate

Abstractl-Lactate, traditionally considered a metabolic waste product, is increasingly recognized as an important intercellular energy currency in mammals. To enable investigations of the emerging roles of intercellular shuttling of l-lactate, we now report an intensiometric green fluorescent genetically encoded biosensor for extracellular l-lactate. This biosensor, designated eLACCO1.1, enables cellular resolution imaging of extracellular l-lactate in cultured mammalian cells and brain tissue.

A CRITICAL ANALYSIS OF DHATUMALA (METABOLIC WASTE PRODUCT)

Ayurveda imparts a great emphasis upon the maintenance of positive health of a person. According to WHO, health is a complete state of physical, mental, social, spiritual well being and not merely the absence of disease. Sushruthas quotation regarding Swastha is exactly same which was told many decades back. Healthy body is the outcome of healthy food and lifestyle and it is the basis for health and disease. Nutrient rich diet which is consumed in proper time and amount will help the body which contributes it to maintain the homeostasis. Food has to be properly digested for the nourishment and formation of healthy Dhathu. Digestion takes place in Mahakoshta and as a result of this, food is converted into Prasadamsa and Kittamsa. Dhatus are formed in a series from Rasa to Shukra from this Prasada portion. Dhatus after their Dhatuagni paka is divided into Sara and Kitta bhaga, and from this Kitta bhaga dhatu malas are formed. Malas represent a wide variety of substances produced by the body through different Pakas conducted in the body. Removal of metabolites and waste products are the basic physiological functions of body. Mala are the waste products that need to be eliminated from the body periodically. Scope of the experiment: Here in this article the physiological interpretation of Dhatumala and its need to be flushed out on regular basis is explained. Physiological view point of Dhathumala will help to understand what it is and how it is formed in the body in a better way to the present generation.

577 Engineered non-pathogenic synthetic biotic producing L-arginine synergize with PD-1-based cancer immunotherapy

BackgroundThe availability of L-arginine in tumors is a key determinant of an efficient anti-tumor T cell response. Consequently, the elevation of typically low L-arginine levels within the tumor may greatly potentiate the anti-tumor responses of immune check point inhibitors, such as PD-L1 blocking antibodies. However, currently no means are available to locally increase intra-tumoral L-arginine levels.MethodsWe used a synthetic biology approach to develop an engineered probiotic Escherichia coli Nissle 1917 strain that colonizes tumors and continuously converts ammonia, a metabolic waste product that accumulates in tumors, into L-arginine.ResultsColonization of tumors with these bacteria elevated intra-tumoral L-arginine concentrations, increased the amount of tumor-infiltrating T cells, and had striking synergistic effects with PD-L1 blocking antibodies in the clearance of tumors. The anti-tumor effect of the living therapeutic was mediated by L-arginine and was dependent on T cells.ConclusionsThese results show that engineered microbial therapies enable metabolic modulation of the tumor microenvironment leading to enhanced efficacy of immunotherapies.

Urea, a true uremic toxin: the empire strikes back

Decreased kidney function results in high blood levels of urea, a metabolic waste product. In this review we discuss urea's direct and indirect toxic effects that may promote adverse outcomes including progression of kidney failure and heart disease.