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Applications of molecular communications to medicine: a survey
Luca Felicetti, Mauro Femminella, Gianluca Reali, Pietro Liò
TL;DR
The paper addresses the limited focus on specific medical applications of nanoscale communications by surveying molecular-communication applications in medicine. It presents a taxonomy, examines application progress and visionary directions, and identifies deployment challenges including energy and storage constraints.
Problem
Specific medical applications of nanoscale communications remain insufficiently foregrounded despite advances in nanotechnology and nanoscale communication proposals.
Method
The paper surveys medical applications developed through molecular communications, proposes a taxonomy, and examines advanced and visionary applications.
Results
The survey reports significant progress in medical applications, particularly in diagnosis and targeted drug delivery.
Takeaways & Limitations
Molecular communications provide a basis for organizing current medical applications while highlighting future directions for advanced healthcare solutions.
Takeaways & Limitations
Deployment remains constrained by the novelty of energy harvesting in biological environments and the energy and space costs of information storage in nanomachines.
Abstract
from arXiv · showhide
In recent years, progresses in nanotechnology have established the foundations for implementing nanomachines capable of carrying out simple but significant tasks. Under this stimulus, researchers have been proposing various solutions for realizing nanoscale communications, considering both electromagnetic and biological communications. Their aim is to extend the capabilities of nanodevices, so as to enable the execution of more complex tasks by means of mutual coordination, achievable through communications. However, although most of these proposals show how devices can communicate at the nanoscales, they leave in the background specific applications of these new technologies. Thus, this paper shows an overview of the actual and potential applications that can rely on a specific class of such communications techniques, commonly referred to as molecular communications. In particular, we focus on health-related applications. This decision is due to the rapidly increasing interests of research communities and companies to minimally invasive, biocompatible, and targeted health-care solutions. Molecular communication techniques have actually the potentials of becoming the main technology for implementing advanced medical solution. Hence, in this paper we provide a taxonomy of potential applications, illustrate them in some details, along with the existing open challenges for them to be actually deployed, and draw future perspectives.
1. Introduction
Molecular communications use biologically inspired molecular signals to coordinate nanodevices, with biocompatibility and minimal invasiveness supporting medical applications. This survey organizes potential medical applications into diagnostic and treatment categories while identifying deployment challenges and future directions.
- Molecular communication foundations: Their biocompatibility and minimal invasiveness make molecular communications an alternative to electromagnetic communications for use in living bodies.
- Molecular communication foundations: Molecular communications use small molecules, including proteins, peptides, carbohydrates, and lipids, to transmit signals between natural or artificial cells.Specialized membrane receptors recognize molecular signals and trigger different cellular behaviors.
- Research gap and survey contribution: Existing nanoscale communication proposals often emphasize communication techniques and protocols without sufficiently analyzing the applications that could benefit from them.
- Research gap and survey contribution: The survey identifies and classifies medical applications of nanoscale molecular communications, complementing earlier work that did not discuss molecular-communication applications and benefits.
- Challenges and outlook: Artificial biological nanomachines are not yet ready for systematic production and exploitation, despite progress in artificial biological components and computational models.
- Medical application landscape: Potential applications span personalized disease predictions from biomarkers, targeted sensing and actuation, drug delivery, immune activation, tissue engineering, nanosurgery, and advanced imaging.Computational models may support personalized risk assessments and treatment identification, while nanomachines may deliver proteins or drugs to localized areas.
- Challenges and outlook: The paper identifies implementation mechanisms, interfaces, open challenges, and future research directions for molecular communications in medical applications.
- Medical application landscape: The taxonomy distinguishes diagnosis from treatment, then organizes diagnosis into detection, personalized diagnosis, and advanced imaging, and treatment into delivery, tissue engineering, nanosurgery, and immune-system triggering.Applications can also be specialized by monitoring, control, and activation or delivery functions, although diagnostic and treatment boundaries overlap.
2. Diagnostic Applications
The survey describes molecular-communication approaches for disease diagnosis, especially tumor detection, using biomarkers, implanted devices, mobile nanosensors, bacteria, and imaging. It also covers personalized risk assessment and imaging applications intended to improve monitoring, targeting, and diagnostic accuracy.
- Diagnostic scope: Molecular communications support disease diagnosis through tumor detection, personalized risk assessment, and imaging applications.The section covers disease detection, personalized diagnosis, and imaging as distinct diagnostic applications.
- Disease detection: Bacteria-based systems exploit tumor-associated molecular cues to migrate toward tumors, supporting tumor monitoring and targeted drug delivery.The described bacterial chemotactic response is faster toward tumor cell lysates than toward normal cells, and the results were verified in vitro and in vivo.
- Disease detection: Circulating tumor-cell concentration provides diagnostic and prognostic information about tumor location and progression, including early disease detection and relapse monitoring.CTC monitoring is described as useful both during initial disease phases and after apparently successful treatment.
- Disease detection: Molecular communications can enable real-time CTC detection with implanted devices, contact-based sensing, or absorption of tumor-derived microvesicles and exosomes.Mobile nanosensors can release signaling-molecule bursts collected by an implanted sink and transferred externally.
- Personalized diagnosis: Personalized diagnosis aims to assess individual disease risk noninvasively and support personalized treatment, including cardiovascular-risk assessment and potentially reduced invasive diagnostic time.The survey identifies possible benefits including reduced mortality and morbidity from cardiovascular disease and less time-consuming diagnostics.
- Imaging: Multiplexed molecular imaging can visualize biological parameters and molecular targets in living systems with increased accuracy compared with classic imaging techniques.The survey also discusses FRET-based molecular sensors, aptamer-targeted imaging, virtual biopsy, and short-range transmission rates up to 10Mbps in simulations.
3. Treatment of Diseases
Molecular communications are presented as a platform for disease treatment, particularly tumor-focused interventions, while also supporting immune activation, regenerative tissue engineering, and nanosurgery.
- Treatment scope: Molecular communications are applied to disease detection and treatment, with special emphasis on tumors.The survey identifies tumor-focused applications as a major class within medical molecular communications.
- Other applications: Additional healthcare applications include triggering immune responses, regenerative tissue engineering, and nanosurgery.Immune-system triggering is described as relevant to tumors and other localized diseases such as inflammations.
3.1. Drug Delivery
Molecular communications support targeted drug delivery through coordinated delivery, monitoring, and control functions. Proposed approaches include diffusion-based, active, viral, bacterial, and feedback-controlled systems aimed at improving localization and treatment effectiveness.
- Drug-delivery goals: Targeted drug delivery aims to localize medication while limiting exposure and toxicity in other parts of the body.The paper identifies localized delivery as a central goal of modern therapeutics.
- Transport and control: Cardiovascular propagation models account for vessel structure and physiological parameters to identify injection points and avoid toxic drug concentrations.These models support optimization of release profiles while minimizing drug reaching other body regions.
- Transport and control: Feedback-controlled release can regulate drug delivery despite communication-medium drift, although the enabling communication conditions require detailed analysis.A related protocol uses feedback messages to control release rate.
- System functions: Drug-delivery systems combine nano-actuators for release, monitoring nodes for measuring drug effects or concentration, and control nodes for feedback regulation.Control nodes can start, stop, or vary release through molecular feedback messages.
- Biological carriers: Viruses can carry artificial payloads into targeted cells, helping prevent drug degradation and improve absorption in desired tissues.The paper connects this approach to gene-therapy applications.
- Biological carriers: Molecular communications with bacteria support coordinated drug-delivery functions, while modified bacteria show tumor selectivity and tumor-regression effects relative to untreated tumors.The cited studies report preferential replication in tumors and notable regression compared with untreated tumors.
3.2. Immune System Activation
Molecular communications can be used to activate or suppress immune responses by coordinating artificial nanomachines with cellular signaling pathways. Proposed mechanisms target immune amplification, inhibition, and functional organization.
- Immune activation: Artificial nanomachines can transmit molecules to trigger immune responses against specific threats.The approach seeks to intensify the immune system’s existing fighting capabilities.
- Immune activation: Humoral activation can involve T-lymphocytes releasing molecules that positively amplify signals to B-lymphocytes, which release antibodies.This describes a molecular feedback pathway for antibody production.
- Immune inhibition: Immune responses may also be inhibited by releasing molecules that reduce activity or by using antagonists to hinder carrier propagation and absorption.The paper describes receptor, soluble, and decoy antagonists as inhibition mechanisms.
- System organization: Immune-system applications can be organized into actuator, monitoring, and control functions, paralleling the organization used for drug delivery.These groups describe distinct functional roles for molecular communication systems.
3.3. Tissue Engineering
Molecular communications support tissue engineering by sensing tissue state, coordinating growth-factor delivery, and shaping cellular responses. Applications include regeneration, smart organs, vascularization, bone repair, and wound healing.
- Regeneration control: Nanomachines could regulate growth-factor absorption and cellular adhesion, migration, proliferation, and differentiation to control new-tissue formation.The paper presents these functions as components of tissue engineering.
- Regeneration control: Engineered organs containing embedded devices could detect diseases, while molecular communications could coordinate precise spatial and temporal release of growth factors and cytokines.The proposed release control is intended to shape tissues and organs.
- Communication interfaces: Calcium signaling and molecular communication are proposed for interfacing nanomachines with tissues, using ion-concentration modulation for information encoding.The same framework identifies actuator, monitoring, and control roles for tissue engineering.
- Tissue sensing: Tissue-embedded nanomachines can infer deformation type and quantity, ion concentration, and communication distance from molecular-network statistics.The proposed inference process uses information collected through communication between nanomachines.
- Tissue sensing: Physical perturbations that change cell volume can alter calcium-ion propagation and therefore affect tissue communication capacity.Calcium diffusion depends substantially on the spatial volume of cells composing the tissue.
- Regeneration constraints: Growth-factor therapies face a short effective lifetime because released factors are rapidly eliminated, making sustained exposure important for tissue regeneration.The paper notes that controlled delivery systems can prolong exposure and maintain concentration nearly constant.
3.4. Nanosurgery
Molecularly coordinated nanomachines and nanosurgical devices extend medical intervention to cellular and intracellular scales. Demonstrated capabilities include delivery, measurement, imaging, manipulation, tracking, and feedback-guided procedures.
- Nanomachine systems: A coordinated nanomachine system was designed with actuators and instruments for cellular-level surgery on live samples.The proposed system combines imaging, manipulation, analysis, and tracking functions.
- Clinical intervention: Externally managed nanomachines could perform semi-autonomous nanosurgery inside the body under human-surgeon supervision.The system is described as correcting lesions through nanomanipulation.
- Clinical intervention: High-precision intracellular surgery could address microvascular obstructions, endothelial-cell damage, tissue structures, and chromosome replacement.These interventions are presented as beyond direct human manipulation.
- Nanomachine systems: An AFM-based nanorobot demonstrated delivery of epidermal growth factor followed by measurement of elasticity responses in contacting cells.The device provided visual feedback for monitoring dynamic changes on a sample surface.
4. Implementation Mechanisms and Interfaces
The paper surveys interfaces that connect molecular communication systems with external devices and support sensing, control, and health monitoring. Proposed mechanisms include smart probes, dermal displays, sweat patches, bacterial signaling, and molecular signal transduction.
- Smart probes: Smart probes connect circulating nanomachines with the external world by collecting molecular messages and releasing aggregated information outside the body.They may also transmit commands that modify nanomachine states and behavior.
- Dermal displays: A dermal display embeds bionanomachines below the epidermis to receive touch-triggered signals and display health information through visible photons.It uses separate interfaces for nanomachine coordination and inbound or outbound communication through the skin.
- Signal transduction: External signals can be transduced into chemical messages through photosensitive, temperature-sensitive, or magnetic materials, while luminescent materials convert molecular signals into optical outputs.Examples include photoactivable proteins, temperature-triggered release from liposomes or dendrimers, DNA hybridization changes, and bioluminescent emission.
- External connectivity: Interfaces have been proposed to connect biological nanonetworks not only with external devices but also with the Internet, forming an Internet of Biological Nano Things.The paper presents this as an interface-enabled extension of molecular communication systems.
- Sweat monitoring: An engineered sweat patch stimulates perspiration, selectively collects ions, analyzes samples on an onboard chip, and wirelessly sends results to a remote device.The system is described as a portable monitoring platform with potential uses in athletics and military applications.
- Bacteria-based communication: Bacteria-based communication can encode molecular information in AHL concentration, causing bacteria to emit GFP signals that communicate information from implanted nanomachines externally.The emitted intensity depends on the encoded AHL concentration.
5. More visionary applications
The paper presents visionary medical applications in targeted therapy, molecular diagnostics, genetic intervention, and disease monitoring. It also identifies major implementation barriers involving nanomachine construction, energy, information storage, biocompatibility, and communication protocols.
- Targeted treatment: DNA nanorobots and molecularly controlled actuators are proposed for targeted cancer treatment, surgery, drug release, and localized pain therapy.The pain-treatment concept combines monitoring, optogenetic activation, and bacteria-based localized drug release tailored to patient needs.
- Targeted treatment: Molecular communication could support personalized pain treatment by focusing therapy on the affected area rather than flooding the whole body with drugs.The proposal links localized delivery with reduced systemic exposure and potentially home-based treatment.
- Molecular diagnostics: Nanomachines could compare circulating RNA from diseased cells with a healthy patient-DNA reference to detect cancer-related or other abnormal patterns.The same monitoring concept is described as potentially identifying viral information and supporting diagnosis and drug release.
- Genetic intervention: Combining molecular communications with CRISPR is proposed for rewriting human genes in treatments for genetic diseases such as cystic fibrosis and sickle-cell anemia.The paper describes CRISPR as a reprogrammable genetic-interference mechanism that can generate logical outputs.
- Disease monitoring: Communicome measurements can identify small groups of molecular factors that form disease signatures in comparisons involving healthy people and Alzheimer’s disease patients.The approach is presented as a minimally invasive way to obtain information about pathophysiological processes from plasma or other fluids.
- Open challenges: Deployment remains constrained because complete nanomachines, biological logic units, energy harvesting, information storage, and multi-access communication protocols are not yet mature.The paper specifically states that biological logic-gate implementation remains in its infancy and that concurrent transmission requires protocols able to handle multi-access interference.
6. Conclusion
The paper surveys medical applications of molecular communications, organizing them into a taxonomy, linking each application to implementation technologies, and examining advanced applications and open research issues.
- The paper surveys medical applications being developed by leveraging molecular communications.
- The authors report significant progress in medical diagnosis and treatment and aim to stimulate further research in this challenging area.
- Interdisciplinary research and joint in-vitro or in-silico experiments can assess many techniques and help discover unexpected phenomena.
- The paper proposes a taxonomy of medical applications and identifies the existing implementation technologies for each application.
- The survey explores advanced and visionary medical applications together with relevant open research issues and future directions.